Fix for Issue #19

.editorconfig

@@ -0,0 +1,40 @@
+# To learn more about .editorconfig see https://aka.ms/editorconfigdocs
+root = true
+
+# All files
+[*]
+indent_style = space
+trim_trailing_whitespace = true
+
+# Code files
+[*.{cs,csx,vb,vbx}]
+indent_size = 4
+end_of_line = crlf
+
+# Xml files
+[*.xml]
+indent_size = 2
+
+# Dotnet code style
+[*.{cs,vb}]
+# Organize usings
+dotnet_sort_system_directives_first = true
+
+# Avoid this. unless absolutely necessary
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+
+# Use language keywords instead of BCL types
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+
+# Naming conventions
+dotnet_naming_style.pascal_case_style.capitalization        = pascal_case
+# Classes, structs, methods, enums, events, properties, namespaces, delegates must be PascalCase
+dotnet_naming_rule.general_naming.severity                  = suggestion
+dotnet_naming_rule.general_naming.symbols                   = general
+dotnet_naming_rule.general_naming.style                     = pascal_case_style
+dotnet_naming_symbols.general.applicable_kinds              = class,struct,enum,property,method,event,namespace,delegate
+dotnet_naming_symbols.general.applicable_accessibilities    = *

Sieve.sln

@@ -7,7 +7,12 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Sieve", "Sieve\Sieve.csproj
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SieveTests", "SieveTests\SieveTests.csproj", "{8043D264-42A0-4275-97A1-46400C02E37E}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SieveUnitTests", "SieveUnitTests\SieveUnitTests.csproj", "{21C3082D-F40E-457F-BE2E-AA099E19E199}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SieveUnitTests", "SieveUnitTests\SieveUnitTests.csproj", "{21C3082D-F40E-457F-BE2E-AA099E19E199}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{904F25A9-5CBD-42AE-8422-ADAB98F4B4B7}"
+	ProjectSection(SolutionItems) = preProject
+		.editorconfig = .editorconfig
+	EndProjectSection
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

Sieve/Attributes/SieveAttribute.cs

@@ -1,11 +1,9 @@
 using Sieve.Models;
 using System;
-using System.Collections.Generic;
-using System.Text;
 
 namespace Sieve.Attributes
 {
-    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
+	[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
     public class SieveAttribute : Attribute, ISievePropertyMetadata
     {
         /// <summary>

Sieve/Exceptions/SieveException.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Text;
 
 namespace Sieve.Exceptions
 {
@@ -13,5 +11,13 @@ namespace Sieve.Exceptions
         public SieveException(string message, Exception innerException) : base(message, innerException)
         {
         }
+
+        public SieveException()
+        {
+        }
+
+        protected SieveException(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context) : base(info, context)
+        {
+        }
     }
 }

Sieve/Exceptions/SieveIncompatibleMethodException.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Text;
 
 namespace Sieve.Exceptions
 {
@@ -10,7 +8,6 @@ namespace Sieve.Exceptions
         public Type ExpectedType { get; protected set; }
         public Type ActualType { get; protected set; }
 
-
         public SieveIncompatibleMethodException(
             string methodName,
             Type expectedType,
@@ -35,5 +32,21 @@ namespace Sieve.Exceptions
             ExpectedType = expectedType;
             ActualType = actualType;
         }
+
+        public SieveIncompatibleMethodException(string message) : base(message)
+        {
+        }
+
+        public SieveIncompatibleMethodException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        public SieveIncompatibleMethodException()
+        {
+        }
+
+        protected SieveIncompatibleMethodException(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context) : base(info, context)
+        {
+        }
     }
 }

Sieve/Exceptions/SieveMethodNotFoundException.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Text;
 
 namespace Sieve.Exceptions
 {
@@ -8,7 +6,7 @@ namespace Sieve.Exceptions
     {
         public string MethodName { get; protected set; }
 
-        public SieveMethodNotFoundException(string methodName, string message) : base (message) 
+        public SieveMethodNotFoundException(string methodName, string message) : base(message)
         {
             MethodName = methodName;
         }
@@ -17,5 +15,21 @@ namespace Sieve.Exceptions
         {
             MethodName = methodName;
         }
+
+        public SieveMethodNotFoundException(string message) : base(message)
+        {
+        }
+
+        public SieveMethodNotFoundException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        public SieveMethodNotFoundException()
+        {
+        }
+
+        protected SieveMethodNotFoundException(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context) : base(info, context)
+        {
+        }
     }
 }

Sieve/Extensions/OrderByDynamic.cs

@@ -1,12 +1,10 @@
 using System;
-using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
-using System.Text;
 
 namespace Sieve.Extensions
 {
-    public static partial class LinqExtentions
+	public static partial class LinqExtentions
     {
         public static IQueryable<TEntity> OrderByDynamic<TEntity>(this IQueryable<TEntity> source, string orderByProperty,
                           bool desc, bool useThenBy)

Sieve/Models/FilterOperator.cs

@@ -1,10 +1,6 @@
-using System;
+namespace Sieve.Models
-using System.Collections.Generic;
-using System.Text;
-
-namespace Sieve.Models
 {
-    public enum FilterOperator
+	public enum FilterOperator
     {
         Equals,
         NotEquals,

Sieve/Models/FilterTerm.cs

@@ -1,14 +1,11 @@
 using System;
-using System.Collections.Generic;
+using System.Linq;
-using System.ComponentModel.DataAnnotations;
-using System.Text;
 
 namespace Sieve.Models
 {
     public class FilterTerm : IFilterTerm
     {
-        private string _filter;
+        private static readonly string[] Operators = new string[] {
-        private string[] operators = new string[] {
                     "==*",
                     "@=*",
                     "_=*",
@@ -24,82 +21,50 @@ namespace Sieve.Models
 
         public FilterTerm(string filter)
         {
-            _filter = filter;
+            var filterSplits = filter.Split(Operators, StringSplitOptions.RemoveEmptyEntries).Select(t => t.Trim()).ToArray();
+            Names = filterSplits[0].Split('|').Select(t => t.Trim()).ToArray();
+            Value = filterSplits.Length > 1 ? filterSplits[1] : null;
+            Operator = Array.Find(Operators, o => filter.Contains(o)) ?? "==";
+            OperatorParsed = GetOperatorParsed(Operator);
+            OperatorIsCaseInsensitive = Operator.Contains("*");
         }
 
-        public string Name
+        public string[] Names { get; }
+
+        public FilterOperator OperatorParsed { get; }
+
+        public string Value { get; }
+
+        public string Operator { get; }
+
+        private FilterOperator GetOperatorParsed(string Operator)
         {
-            get
+            switch (Operator.Trim().ToLower())
             {
-                var tokens = _filter.Split(operators, StringSplitOptions.RemoveEmptyEntries);
+                case "==":
-                return tokens.Length > 0 ? tokens[0].Trim() : "";
+                case "==*":
-                
+                    return FilterOperator.Equals;
+                case "!=":
+                    return FilterOperator.NotEquals;
+                case "<":
+                    return FilterOperator.LessThan;
+                case ">":
+                    return FilterOperator.GreaterThan;
+                case ">=":
+                    return FilterOperator.GreaterThanOrEqualTo;
+                case "<=":
+                    return FilterOperator.LessThanOrEqualTo;
+                case "@=":
+                case "@=*":
+                    return FilterOperator.Contains;
+                case "_=":
+                case "_=*":
+                    return FilterOperator.StartsWith;
+                default:
+                    return FilterOperator.Equals;
             }
         }
 
-        public string Operator
+        public bool OperatorIsCaseInsensitive { get; }
-        {
-            get
-            {
-                foreach (var op in operators)
-                {
-                    if (_filter.IndexOf(op) != -1)
-                    {
-                        return op;
-                    }
-                }
-
-                // Custom operators not supported
-                // var tokens = _filter.Split(' ');
-                // return tokens.Length > 2 ? tokens[1] : "";
-                return "";
-            }
-        }
-
-        public string Value {
-            get
-            {
-                var tokens = _filter.Split(operators, StringSplitOptions.RemoveEmptyEntries);
-                return tokens.Length > 1 ? tokens[1].Trim() : null;
-            }
-        }
-
-        public FilterOperator OperatorParsed {
-            get
-            {
-                switch (Operator.Trim().ToLower())
-                {
-                    case "==":
-                    case "==*":
-                        return FilterOperator.Equals;
-                    case "!=":
-                        return FilterOperator.NotEquals;
-                    case "<":
-                        return FilterOperator.LessThan;
-                    case ">":
-                        return FilterOperator.GreaterThan;
-                    case ">=":
-                        return FilterOperator.GreaterThanOrEqualTo;
-                    case "<=":
-                        return FilterOperator.LessThanOrEqualTo;
-                    case "@=":
-                    case "@=*":
-                        return FilterOperator.Contains;
-                    case "_=":
-                    case "_=*":
-                        return FilterOperator.StartsWith;
-                    default:
-                        return FilterOperator.Equals;
-                }
-            }
-        }
-
-        public bool OperatorIsCaseInsensitive
-        {
-            get
-            {
-                return Operator.Contains("*");
-            }
-        }
     }
 }

Sieve/Models/IFilterTerm.cs

@@ -1,13 +1,8 @@
-using System;
+namespace Sieve.Models
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
-using System.Text;
-
-namespace Sieve.Models
 {
     public interface IFilterTerm
     {
-        string Name { get; }
+        string[] Names { get; }
         string Operator { get; }
         bool OperatorIsCaseInsensitive { get; }
         FilterOperator OperatorParsed { get; }

Sieve/Models/ISieveModel.cs

@@ -1,11 +1,8 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
-using System.Text;
 
 namespace Sieve.Models
 {
-    public interface ISieveModel<TFilterTerm, TSortTerm> 
+	public interface ISieveModel<TFilterTerm, TSortTerm>
         where TFilterTerm : IFilterTerm
         where TSortTerm : ISortTerm
     {

Sieve/Models/ISievePropertyMetadata.cs

@@ -1,11 +1,6 @@
-using System;
+namespace Sieve.Models
-using System.Collections.Generic;
-using System.Reflection;
-using System.Text;
-
-namespace Sieve.Models
 {
-    public interface ISievePropertyMetadata
+	public interface ISievePropertyMetadata
     {
         string Name { get; set; }
         bool CanFilter { get; set; }

Sieve/Models/ISortTerm.cs

@@ -1,11 +1,6 @@
-using System;
+namespace Sieve.Models
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
-using System.Text;
-
-namespace Sieve.Models
 {
-    public interface ISortTerm
+	public interface ISortTerm
     {
         bool Descending { get; }
         string Name { get; }

Sieve/Models/SieveModel.cs

@@ -1,23 +1,20 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
-using System.Text;
 
 namespace Sieve.Models
 {
-    public class SieveModel: ISieveModel<IFilterTerm, ISortTerm>
+    public class SieveModel : ISieveModel<IFilterTerm, ISortTerm>
     {
         public string Filters { get; set; }
 
         public string Sorts { get; set; }
 
-        [Range(1, Double.MaxValue)]
+        [Range(1, int.MaxValue)]
         public int? Page { get; set; }
 
-        [Range(1, Double.MaxValue)]
+        [Range(1, int.MaxValue)]
         public int? PageSize { get; set; }
 
-
         public List<IFilterTerm> FiltersParsed
         {
             get
@@ -30,11 +27,8 @@ namespace Sieve.Models
                         if (filter.StartsWith("("))
                         {
                             var filterOpAndVal = filter.Substring(filter.LastIndexOf(")") + 1);
-                            var subfilters = filter.Replace(filterOpAndVal, "").Replace("(", "").Replace(")","");
+                            var subfilters = filter.Replace(filterOpAndVal, "").Replace("(", "").Replace(")", "");
-                            foreach (var subfilter in subfilters.Split('|'))
+                            value.Add(new FilterTerm(subfilters + filterOpAndVal));
-                            {
-                                value.Add(new FilterTerm(subfilter + filterOpAndVal));
-                            }
                         }
                         else
                         {

Sieve/Models/SieveOptions.cs

@@ -1,11 +1,6 @@
-using Microsoft.Extensions.Options;
+namespace Sieve.Models
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace Sieve.Models
 {
-    public class SieveOptions
+	public class SieveOptions
     {
         public bool CaseSensitive { get; set; } = false;
 

Sieve/Models/SievePropertyMetadata.cs

@@ -1,11 +1,6 @@
-using System;
+namespace Sieve.Models
-using System.Collections.Generic;
-using System.Reflection;
-using System.Text;
-
-namespace Sieve.Models
 {
-    public class SievePropertyMetadata : ISievePropertyMetadata
+	public class SievePropertyMetadata : ISievePropertyMetadata
     {
         public string Name { get; set; }
         public bool CanFilter { get; set; }

Sieve/Models/SortTerm.cs

@@ -1,47 +1,16 @@
-using System;
+namespace Sieve.Models
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
-using System.Text;
-
-namespace Sieve.Models
 {
     public class SortTerm : ISortTerm
     {
-        private string _sort;
+        private readonly string _sort;
 
         public SortTerm(string sort)
         {
             _sort = sort;
         }
 
-        public string Name
+        public string Name => (_sort.StartsWith("-")) ? _sort.Substring(1) : _sort;
-        {
-            get
-            {
-                if (_sort.StartsWith("-"))
-                {
-                    return _sort.Substring(1);
-                }
-                else
-                {
-                    return _sort;
-                }
-            }
-        }
 
-        public bool Descending
+        public bool Descending => _sort.StartsWith("-");
-        {
-            get
-            {
-                if (_sort.StartsWith("-"))
-                {
-                    return true;
-                }
-                else
-                {
-                    return false;
-                }
-            }
-        }
     }
 }

Sieve/Services/ISieveCustomFilterMethods.cs

@@ -1,10 +1,6 @@
-using System;
+namespace Sieve.Services
-using System.Collections.Generic;
-using System.Text;
-
-namespace Sieve.Services
 {
-    public interface ISieveCustomFilterMethods
+	public interface ISieveCustomFilterMethods
     {
     }
 }

Sieve/Services/ISieveCustomSortMethods.cs

@@ -1,10 +1,6 @@
-using System;
+namespace Sieve.Services
-using System.Collections.Generic;
-using System.Text;
-
-namespace Sieve.Services
 {
-    public interface ISieveCustomSortMethods
+	public interface ISieveCustomSortMethods
     {
     }
 }

Sieve/Services/ISieveProcessor.cs

@@ -1,10 +1,9 @@
-using System.Collections.Generic;
+using System.Linq;
-using System.Linq;
 using Sieve.Models;
 
 namespace Sieve.Services
 {
-    public interface ISieveProcessor
+	public interface ISieveProcessor
     {
         IQueryable<TEntity> Apply<TEntity>(
             ISieveModel<IFilterTerm, ISortTerm> model,

Sieve/Services/SieveProcessor.cs

@@ -1,27 +1,22 @@
-using Microsoft.Extensions.Options;
+using System;
-using Sieve.Models;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Reflection;
-using Sieve.Attributes;
-using Sieve.Extensions;
 using System.ComponentModel;
-using System.Collections;
+using System.Linq;
 using System.Linq.Expressions;
+using System.Reflection;
+using Microsoft.Extensions.Options;
+using Sieve.Attributes;
 using Sieve.Exceptions;
+using Sieve.Extensions;
+using Sieve.Models;
 
 namespace Sieve.Services
 {
     public class SieveProcessor : ISieveProcessor
     {
-        private IOptions<SieveOptions> _options;
+        private readonly IOptions<SieveOptions> _options;
-        private ISieveCustomSortMethods _customSortMethods;
+        private readonly ISieveCustomSortMethods _customSortMethods;
-        private ISieveCustomFilterMethods _customFilterMethods;
+        private readonly ISieveCustomFilterMethods _customFilterMethods;
-        private SievePropertyMapper mapper = new SievePropertyMapper();
+        private readonly SievePropertyMapper mapper = new SievePropertyMapper();
-        
 
         public SieveProcessor(IOptions<SieveOptions> options,
             ISieveCustomSortMethods customSortMethods,
@@ -77,21 +72,29 @@ namespace Sieve.Services
             var result = source;
 
             if (model == null)
+            {
                 return result;
+            }
 
             try
             {
                 // Filter
                 if (applyFiltering)
+                {
                     result = ApplyFiltering(model, result, dataForCustomMethods);
+                }
 
                 // Sort
                 if (applySorting)
+                {
                     result = ApplySorting(model, result, dataForCustomMethods);
+                }
 
                 // Paginate
                 if (applyPagination)
+                {
                     result = ApplyPagination(model, result);
+                }
 
                 return result;
             }
@@ -100,7 +103,10 @@ namespace Sieve.Services
                 if (_options.Value.ThrowExceptions)
                 {
                     if (ex is SieveException)
+                    {
                         throw;
+                    }
+
                     throw new SieveException(ex.Message, ex);
                 }
                 else
@@ -116,89 +122,99 @@ namespace Sieve.Services
             object[] dataForCustomMethods = null)
         {
             if (model?.FiltersParsed == null)
-                return result;
-
-            foreach (var filterTerm in model.FiltersParsed)
             {
-                var property = GetSieveProperty<TEntity>(false, true, filterTerm.Name);
+                return result;
-
-                if (property != null)
-                {
-                    var converter = TypeDescriptor.GetConverter(property.PropertyType);
-                    var parameter = Expression.Parameter(typeof(TEntity), "e");
-
-                    dynamic filterValue = Expression.Constant(
-                        converter.CanConvertFrom(typeof(string)) ?
-                        converter.ConvertFrom(filterTerm.Value) :
-                        Convert.ChangeType(filterTerm.Value, property.PropertyType));
-
-                    dynamic propertyValue = Expression.PropertyOrField(parameter, property.Name);
-
-                    if (filterTerm.OperatorIsCaseInsensitive)
-                    {
-                        propertyValue = Expression.Call(propertyValue,
-                            typeof(string).GetMethods()
-                            .First(m => m.Name == "ToUpper" && m.GetParameters().Length == 0));
-
-                        filterValue = Expression.Call(filterValue,
-                            typeof(string).GetMethods()
-                            .First(m => m.Name == "ToUpper" && m.GetParameters().Length == 0));
-                    }
-
-                    Expression comparison;
-
-                    switch (filterTerm.OperatorParsed)
-                    {
-                        case FilterOperator.Equals:
-                            comparison = Expression.Equal(propertyValue, filterValue);
-                            break;
-                        case FilterOperator.NotEquals:
-                            comparison = Expression.NotEqual(propertyValue, filterValue);
-                            break;
-                        case FilterOperator.GreaterThan:
-                            comparison = Expression.GreaterThan(propertyValue, filterValue);
-                            break;
-                        case FilterOperator.LessThan:
-                            comparison = Expression.LessThan(propertyValue, filterValue);
-                            break;
-                        case FilterOperator.GreaterThanOrEqualTo:
-                            comparison = Expression.GreaterThanOrEqual(propertyValue, filterValue);
-                            break;
-                        case FilterOperator.LessThanOrEqualTo:
-                            comparison = Expression.LessThanOrEqual(propertyValue, filterValue);
-                            break;
-                        case FilterOperator.Contains:
-                            comparison = Expression.Call(propertyValue,
-                                typeof(string).GetMethods()
-                                .First(m => m.Name == "Contains" && m.GetParameters().Length == 1),
-                                filterValue);
-                            break;
-                        case FilterOperator.StartsWith:
-                            comparison = Expression.Call(propertyValue,
-                                typeof(string).GetMethods()
-                                .First(m => m.Name == "StartsWith" && m.GetParameters().Length == 1),
-                                filterValue); break;
-                        default:
-                            comparison = Expression.Equal(propertyValue, filterValue);
-                            break;
-                    }
-
-                    result = result.Where(Expression.Lambda<Func<TEntity, bool>>(
-                                comparison,
-                                parameter));
-                }
-                else
-                {
-                    result = ApplyCustomMethod(result, filterTerm.Name, _customFilterMethods,
-                        new object[] {
-                        result,
-                        filterTerm.Operator,
-                        filterTerm.Value
-                        }, dataForCustomMethods);
-                }
             }
 
-            return result;
+            Expression outerExpression = null;
+            var parameterExpression = Expression.Parameter(typeof(TEntity), "e");
+            foreach (var filterTerm in model.FiltersParsed)
+            {
+                Expression innerExpression = null;
+                foreach (var filterTermName in filterTerm.Names)
+                {
+                    var property = GetSieveProperty<TEntity>(false, true, filterTermName);
+                    if (property != null)
+                    {
+                        var converter = TypeDescriptor.GetConverter(property.PropertyType);
+                        dynamic filterValue = Expression.Constant(
+                            converter.CanConvertFrom(typeof(string))
+                                ? converter.ConvertFrom(filterTerm.Value)
+                                : Convert.ChangeType(filterTerm.Value, property.PropertyType));
+
+                        dynamic propertyValue = Expression.PropertyOrField(parameterExpression, property.Name);
+
+                        if (filterTerm.OperatorIsCaseInsensitive)
+                        {
+                            propertyValue = Expression.Call(propertyValue,
+                                typeof(string).GetMethods()
+                                .First(m => m.Name == "ToUpper" && m.GetParameters().Length == 0));
+
+                            filterValue = Expression.Call(filterValue,
+                                typeof(string).GetMethods()
+                                .First(m => m.Name == "ToUpper" && m.GetParameters().Length == 0));
+                        }
+
+                        if (innerExpression == null)
+                        {
+                            innerExpression = GetExpression(filterTerm, filterValue, propertyValue);
+                        }
+                        else
+                        {
+                            innerExpression = Expression.Or(innerExpression, GetExpression(filterTerm, filterValue, propertyValue));
+                        }
+                    }
+                    else
+                    {
+                        var parameters = new object[] {
+                                            result,
+                                            filterTerm.Operator,
+                                            filterTerm.Value
+                            };
+                        result = ApplyCustomMethod(result, filterTermName, _customFilterMethods, parameters, dataForCustomMethods);
+                    }
+                }
+                if (outerExpression == null)
+                {
+                    outerExpression = innerExpression;
+                    continue;
+                }
+                outerExpression = Expression.And(outerExpression, innerExpression);
+            }
+            return outerExpression == null
+                ? result
+                : result.Where(Expression.Lambda<Func<TEntity, bool>>(outerExpression, parameterExpression));
+        }
+
+        private static Expression GetExpression(IFilterTerm filterTerm, dynamic filterValue, dynamic propertyValue)
+        {
+            switch (filterTerm.OperatorParsed)
+            {
+                case FilterOperator.Equals:
+                    return Expression.Equal(propertyValue, filterValue);
+                case FilterOperator.NotEquals:
+                    return Expression.NotEqual(propertyValue, filterValue);
+                case FilterOperator.GreaterThan:
+                    return Expression.GreaterThan(propertyValue, filterValue);
+                case FilterOperator.LessThan:
+                    return Expression.LessThan(propertyValue, filterValue);
+                case FilterOperator.GreaterThanOrEqualTo:
+                    return Expression.GreaterThanOrEqual(propertyValue, filterValue);
+                case FilterOperator.LessThanOrEqualTo:
+                    return Expression.LessThanOrEqual(propertyValue, filterValue);
+                case FilterOperator.Contains:
+                    return Expression.Call(propertyValue,
+                        typeof(string).GetMethods()
+                        .First(m => m.Name == "Contains" && m.GetParameters().Length == 1),
+                        filterValue);
+                case FilterOperator.StartsWith:
+                    return Expression.Call(propertyValue,
+                        typeof(string).GetMethods()
+                        .First(m => m.Name == "StartsWith" && m.GetParameters().Length == 1),
+                        filterValue);
+                default:
+                    return Expression.Equal(propertyValue, filterValue);
+            }
         }
 
         private IQueryable<TEntity> ApplySorting<TEntity>(
@@ -207,7 +223,9 @@ namespace Sieve.Services
             object[] dataForCustomMethods = null)
         {
             if (model?.SortsParsed == null)
+            {
                 return result;
+            }
 
             var useThenBy = false;
             foreach (var sortTerm in model.SortsParsed)
@@ -245,12 +263,13 @@ namespace Sieve.Services
             result = result.Skip((page - 1) * pageSize);
 
             if (pageSize > 0)
+            {
                 result = result.Take(Math.Min(pageSize, maxPageSize));
+            }
 
             return result;
         }
 
-
         protected virtual SievePropertyMapper MapProperties(SievePropertyMapper mapper)
         {
             return mapper;
@@ -269,19 +288,13 @@ namespace Sieve.Services
             bool canSortRequired,
             bool canFilterRequired,
             string name,
-            bool isCaseSensitive)
+            bool isCaseSensitive) => Array.Find(typeof(TEntity).GetProperties(), p =>
-        {
-            return typeof(TEntity).GetProperties().FirstOrDefault(p =>
             {
-                if (p.GetCustomAttribute(typeof(SieveAttribute)) is SieveAttribute sieveAttribute)
+                return p.GetCustomAttribute(typeof(SieveAttribute)) is SieveAttribute sieveAttribute
-                    if ((canSortRequired ? sieveAttribute.CanSort : true) &&
+                    && (canSortRequired ? sieveAttribute.CanSort : true)
-                        (canFilterRequired ? sieveAttribute.CanFilter : true) &&
+                    && (canFilterRequired ? sieveAttribute.CanFilter : true)
-                        ((sieveAttribute.Name ?? p.Name).Equals(name,
+                    && ((sieveAttribute.Name ?? p.Name).Equals(name, isCaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase));
-                            isCaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase)))
-                        return true;
-                return false;
             });
-        }
 
         private IQueryable<TEntity> ApplyCustomMethod<TEntity>(IQueryable<TEntity> result, string name, object parent, object[] parameters, object[] optionalParameters = null)
         {
@@ -308,7 +321,7 @@ namespace Sieve.Services
                         throw;
                     }
                 }
-                catch (ArgumentException) // name matched with custom method for a differnt type
+                catch (ArgumentException) // name matched with custom method for a different type
                 {
                     var expected = typeof(IQueryable<TEntity>);
                     var actual = customMethod.ReturnType;
@@ -318,8 +331,7 @@ namespace Sieve.Services
             }
             else
             {
-                throw new SieveMethodNotFoundException(name, 
+                throw new SieveMethodNotFoundException(name, $"{name} not found.");
-                    $"{name} not found.");
             }
 
             return result;

Sieve/Services/SievePropertyMapper.cs

@@ -4,27 +4,28 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
-using System.Text;
 
 namespace Sieve.Services
 {
-    public class SievePropertyMapper
+	public class SievePropertyMapper
     {
-        private Dictionary<Type, Dictionary<PropertyInfo, ISievePropertyMetadata>> _map
+        private readonly Dictionary<Type, Dictionary<PropertyInfo, ISievePropertyMetadata>> _map
             = new Dictionary<Type, Dictionary<PropertyInfo, ISievePropertyMetadata>>();
 
         public PropertyFluentApi<TEntity> Property<TEntity>(Expression<Func<TEntity, object>> expression)
         {
             if(!_map.ContainsKey(typeof(TEntity)))
+            {
                 _map.Add(typeof(TEntity), new Dictionary<PropertyInfo, ISievePropertyMetadata>());
+            }
 
             return new PropertyFluentApi<TEntity>(this, expression);
         }
 
         public class PropertyFluentApi<TEntity>
         {
-            private SievePropertyMapper _sievePropertyMapper;
+            private readonly SievePropertyMapper _sievePropertyMapper;
-            private PropertyInfo _property;
+            private readonly PropertyInfo _property;
 
             public PropertyFluentApi(SievePropertyMapper sievePropertyMapper, Expression<Func<TEntity, object>> expression)
             {
@@ -92,16 +93,14 @@ namespace Sieve.Services
             {
                 return _map[typeof(TEntity)]
                     .FirstOrDefault(kv =>
-                    kv.Value.Name.Equals(name, isCaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase) &&
+                    kv.Value.Name.Equals(name, isCaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase)
-                    (canSortRequired ? kv.Value.CanSort : true) &&
+                    && (canSortRequired ? kv.Value.CanSort : true)
-                    (canFilterRequired ? kv.Value.CanFilter : true)).Key;
+                    && (canFilterRequired ? kv.Value.CanFilter : true)).Key;
             }
             catch (Exception ex) when (ex is KeyNotFoundException || ex is ArgumentNullException)
             {
                 return null;
             }
-
         }
-        
     }
 }

SieveTests/Controllers/PostsController.cs

@@ -1,7 +1,4 @@
-using System;
+using System.Linq;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using Sieve.Models;
@@ -10,11 +7,11 @@ using SieveTests.Entities;
 
 namespace SieveTests.Controllers
 {
-    [Route("api/[controller]/[action]")]
+	[Route("api/[controller]/[action]")]
     public class PostsController : Controller
     {
-        private ISieveProcessor _sieveProcessor;
+        private readonly ISieveProcessor _sieveProcessor;
-        private ApplicationDbContext _dbContext;
+        private readonly ApplicationDbContext _dbContext;
 
         public PostsController(ISieveProcessor sieveProcessor,
             ApplicationDbContext dbContext)

SieveTests/Entities/ApplicationDbContext.cs

@@ -1,13 +1,8 @@
-using JetBrains.Annotations;
+using Microsoft.EntityFrameworkCore;
-using Microsoft.EntityFrameworkCore;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 
 namespace SieveTests.Entities
 {
-    public class ApplicationDbContext : DbContext
+	public class ApplicationDbContext : DbContext
     {
         public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options) { }
 

SieveTests/Entities/Post.cs

@@ -1,12 +1,9 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using Sieve.Attributes;
 
 namespace SieveTests.Entities
 {
-    public class Post
+	public class Post
     {
         public int Id { get; set; }
 

SieveTests/Migrations/20180127005347_Init.cs

@@ -1,7 +1,6 @@
-using Microsoft.EntityFrameworkCore.Metadata;
+using System;
+using Microsoft.EntityFrameworkCore.Metadata;
 using Microsoft.EntityFrameworkCore.Migrations;
-using System;
-using System.Collections.Generic;
 
 namespace SieveTests.Migrations
 {
@@ -20,10 +19,7 @@ namespace SieveTests.Migrations
                     LikeCount = table.Column<int>(nullable: false),
                     Title = table.Column<string>(nullable: true)
                 },
-                constraints: table =>
+                constraints: table => table.PrimaryKey("PK_Posts", x => x.Id));
-                {
-                    table.PrimaryKey("PK_Posts", x => x.Id);
-                });
         }
 
         protected override void Down(MigrationBuilder migrationBuilder)

SieveTests/Program.cs

@@ -1,16 +1,9 @@
-using System;
+using Microsoft.AspNetCore;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Hosting;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.Logging;
 
 namespace SieveTests
 {
-    public class Program
+    public static class Program
     {
         public static void Main(string[] args)
         {

SieveTests/Services/ApplicationSieveProcessor.cs

@@ -2,14 +2,10 @@
 using Sieve.Models;
 using Sieve.Services;
 using SieveTests.Entities;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 
 namespace SieveTests.Services
 {
-    public class ApplicationSieveProcessor : SieveProcessor
+	public class ApplicationSieveProcessor : SieveProcessor
     {
         public ApplicationSieveProcessor(IOptions<SieveOptions> options, ISieveCustomSortMethods customSortMethods, ISieveCustomFilterMethods customFilterMethods) : base(options, customSortMethods, customFilterMethods)
         {

SieveTests/Services/SieveCustomFilterMethods.cs

@@ -1,20 +1,12 @@
 using Sieve.Services;
 using SieveTests.Entities;
-using System;
-using System.Collections.Generic;
 using System.Linq;
-using System.Threading.Tasks;
 
 namespace SieveTests.Services
 {
-    public class SieveCustomFilterMethods : ISieveCustomFilterMethods
+	public class SieveCustomFilterMethods : ISieveCustomFilterMethods
     {
-        public IQueryable<Post> IsNew(IQueryable<Post> source, string op, string value)
+        public IQueryable<Post> IsNew(IQueryable<Post> source)
-        {
+            => source.Where(p => p.LikeCount < 100 && p.CommentCount < 5);
-            var result = source.Where(p => p.LikeCount < 100 &&
-                                           p.CommentCount < 5);
-
-            return result;
-        }
     }
 }

SieveTests/Services/SieveCustomSortMethods.cs

@@ -1,23 +1,15 @@
-using Sieve.Services;
+using System.Linq;
+using Sieve.Services;
 using SieveTests.Entities;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 
 namespace SieveTests.Services
 {
     public class SieveCustomSortMethods : ISieveCustomSortMethods
     {
-        public IQueryable<Post> Popularity(IQueryable<Post> source, bool useThenBy, bool desc)
+        public IQueryable<Post> Popularity(IQueryable<Post> source, bool useThenBy) => useThenBy
-        {
+            ? ((IOrderedQueryable<Post>)source).ThenBy(p => p.LikeCount)
-            var result = useThenBy ?
+            : source.OrderBy(p => p.LikeCount)
-                ((IOrderedQueryable<Post>)source).ThenBy(p => p.LikeCount) :
-                source.OrderBy(p => p.LikeCount)
                 .ThenBy(p => p.CommentCount)
                 .ThenBy(p => p.DateCreated);
-
-            return result;
-        }
     }
 }

SieveTests/Startup.cs

@@ -1,14 +1,8 @@
-using System;
+using Microsoft.AspNetCore.Builder;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Logging;
-using Microsoft.Extensions.Options;
 using Sieve.Models;
 using Sieve.Services;
 using SieveTests.Entities;
@@ -16,7 +10,7 @@ using SieveTests.Services;
 
 namespace SieveTests
 {
-    public class Startup
+	public class Startup
     {
         public Startup(IConfiguration configuration)
         {

SieveUnitTests/Entities/Comment.cs

@@ -1,12 +1,6 @@
-using System;
+namespace SieveUnitTests.Entities
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Sieve.Attributes;
-
-namespace SieveUnitTests.Entities
 {
-    public class Comment
+	public class Comment
     {
         public int Id { get; set; }
 

SieveUnitTests/Entities/Post.cs

@@ -1,12 +1,9 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using Sieve.Attributes;
 
 namespace SieveUnitTests.Entities
 {
-    public class Post
+	public class Post
     {
         public int Id { get; set; }
 

SieveUnitTests/General.cs

@@ -1,20 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Sieve.Exceptions;
 using Sieve.Models;
 using Sieve.Services;
 using SieveUnitTests.Entities;
 using SieveUnitTests.Services;
-using System;
-using System.Linq;
-using System.Collections.Generic;
-using Sieve.Exceptions;
 
 namespace SieveUnitTests
 {
     [TestClass]
     public class General
     {
-        private SieveProcessor _processor;
+        private readonly SieveProcessor _processor;
-        private IQueryable<Post> _posts;
+        private readonly IQueryable<Post> _posts;
 
         public General()
         {
@@ -43,7 +43,7 @@ namespace SieveUnitTests
                 },
                 new Post() {
                     Id = 3,
-                    Title = "3",
+                    Title = "D",
                     LikeCount = 3,
                     IsDraft = true
                 },
@@ -90,7 +90,6 @@ namespace SieveUnitTests
             Assert.IsTrue(result.Count() == 2);
         }
 
-
         [TestMethod]
         public void CanSortBools()
         {
@@ -112,14 +111,12 @@ namespace SieveUnitTests
                 Filters = "LikeCount==50",
             };
 
-            Console.WriteLine(model.FiltersParsed.First().Value);
+            Console.WriteLine(model.FiltersParsed[0].Value);
-            Console.WriteLine(model.FiltersParsed.First().Operator);
+            Console.WriteLine(model.FiltersParsed[0].Operator);
-            Console.WriteLine(model.FiltersParsed.First().OperatorParsed);
+            Console.WriteLine(model.FiltersParsed[0].OperatorParsed);
 
             var result = _processor.Apply(model, _posts);
 
-
-
             Assert.AreEqual(result.First().Id, 1);
             Assert.IsTrue(result.Count() == 1);
         }
@@ -169,15 +166,12 @@ namespace SieveUnitTests
             };
 
             var result = _processor.Apply(model, _posts);
+            var entry = result.FirstOrDefault();
+            var resultCount = result.Count();
 
-            Assert.AreEqual(result.First().Id, 3);
+            Assert.IsNotNull(entry);
-            Assert.IsTrue(result.Count() == 1);
+            Assert.AreEqual(1, resultCount);
+            Assert.AreEqual(3, entry.Id);
         }
     }
 }
-
-//
-//Sorts = "LikeCount",
-//Page = 1,
-//PageSize = 10
-//

SieveUnitTests/Mapper.cs

@@ -1,20 +1,18 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Sieve.Models;
-using Sieve.Services;
 using SieveUnitTests.Entities;
 using SieveUnitTests.Services;
-using System;
 using System.Linq;
 using System.Collections.Generic;
 using Sieve.Exceptions;
 
 namespace SieveUnitTests
 {
-    [TestClass]
+	[TestClass]
     public class Mapper
     {
-        private ApplicationSieveProcessor _processor;
+        private readonly ApplicationSieveProcessor _processor;
-        private IQueryable<Post> _posts;
+        private readonly IQueryable<Post> _posts;
 
         public Mapper()
         {

SieveUnitTests/Services/ApplicationSieveProcessor.cs

@@ -2,14 +2,10 @@
 using Sieve.Models;
 using Sieve.Services;
 using SieveUnitTests.Entities;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 
 namespace SieveUnitTests.Services
 {
-    public class ApplicationSieveProcessor : SieveProcessor
+	public class ApplicationSieveProcessor : SieveProcessor
     {
         public ApplicationSieveProcessor(
             IOptions<SieveOptions> options,

SieveUnitTests/Services/SieveCustomFilterMethods.cs

@@ -1,24 +1,15 @@
-using Sieve.Services;
+using System.Linq;
+using Sieve.Services;
 using SieveUnitTests.Entities;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 
 namespace SieveUnitTests.Services
 {
     public class SieveCustomFilterMethods : ISieveCustomFilterMethods
     {
-        public IQueryable<Post> IsNew(IQueryable<Post> source, string op, string value)
+        public IQueryable<Post> IsNew(IQueryable<Post> source)
-        {
+            => source.Where(p => p.LikeCount < 100);
-            var result = source.Where(p => p.LikeCount < 100);
 
-            return result;
+        public IQueryable<Comment> TestComment(IQueryable<Comment> source)
-        }
+            => source;
-
-        public IQueryable<Comment> TestComment(IQueryable<Comment> source, string op, string value)
-        {
-            return source;
-        }
     }
 }

SieveUnitTests/Services/SieveCustomSortMethods.cs

@@ -1,23 +1,15 @@
-using Sieve.Services;
+using System.Linq;
+using Sieve.Services;
 using SieveUnitTests.Entities;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 
 namespace SieveUnitTests.Services
 {
     public class SieveCustomSortMethods : ISieveCustomSortMethods
     {
-        public IQueryable<Post> Popularity(IQueryable<Post> source, bool useThenBy, bool desc)
+        public IQueryable<Post> Popularity(IQueryable<Post> source, bool useThenBy) => useThenBy
-        {
+            ? ((IOrderedQueryable<Post>)source).ThenBy(p => p.LikeCount)
-            var result = useThenBy ?
+            : source.OrderBy(p => p.LikeCount)
-                ((IOrderedQueryable<Post>)source).ThenBy(p => p.LikeCount) :
-                source.OrderBy(p => p.LikeCount)
                 .ThenBy(p => p.CommentCount)
                 .ThenBy(p => p.DateCreated);
-
-            return result;
-        }
     }
 }

SieveUnitTests/Services/SieveOptionsAccessor.cs

@@ -1,26 +1,15 @@
 using Microsoft.Extensions.Options;
 using Sieve.Models;
-using System;
-using System.Collections.Generic;
-using System.Text;
 
 namespace SieveUnitTests
 {
     public class SieveOptionsAccessor : IOptions<SieveOptions>
     {
-        private SieveOptions _value;
+        public SieveOptions Value { get; }
-
-        public SieveOptions Value
-        {
-            get
-            {
-                return _value;
-            }
-        }
 
         public SieveOptionsAccessor()
         {
-            _value = new SieveOptions()
+            Value = new SieveOptions()
             {
                 ThrowExceptions = true
             };