add EqualByValues<T> little class

Value.Net45/Value.Net45.csproj

@@ -10,7 +10,7 @@
     <RootNamespace>Value</RootNamespace>
     <AssemblyName>Value</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
+    <FileAlignment>512</FileAlignment> 
   </PropertyGroup>
   <PropertyGroup>
     <GenerateAssemblyConfigurationAttribute>false</GenerateAssemblyConfigurationAttribute>
@@ -58,4 +58,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>

Value.Tests/EqualByValuesTest.cs

@@ -0,0 +1,30 @@
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Value.Shared;
+
+namespace Value.Tests
+{
+    [TestFixture]
+    public class EqualByValuesTest
+    {
+        [Test]
+        public void Should_be_equal_by_values()
+        {
+            var coll1 = new string[] { "Hello", "Apple", "C#" };
+            var coll2 = new string[] { "C#", "Hello", "Apple" };
+            Assert.IsTrue(new EqualByValues<string>(coll1, coll2));
+        }
+
+        [Test]
+        public void Should_not_be_equal_by_values()
+        {
+            var coll1 = new string[] { "Hello", "Apple", "C#", "Java" };
+            var coll2 = new string[] { "C#", "Hello", "Apple" };
+            Assert.IsTrue(new EqualByValues<string>(coll1, coll2));
+        }
+    }
+}

Value.Tests/Value.Tests.csproj

@@ -47,6 +47,7 @@
   <ItemGroup>
     <Compile Include="AmountTests.cs" />
     <Compile Include="DictionaryByValueTests.cs" />
+    <Compile Include="EqualByValuesTest.cs" />
     <Compile Include="SetByValueTests.cs" />
     <Compile Include="Samples\ThreeCards.cs" />
     <Compile Include="Samples\Amount.cs" />
@@ -66,10 +67,10 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
-    <None Include="packages.config" />
+    <Folder Include="Properties\" />
   </ItemGroup>
   <ItemGroup>
-    <Folder Include="Properties\" />
+    <None Include="packages.config" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
@@ -79,4 +80,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>

Value.Tests/packages.config

@@ -3,4 +3,4 @@
   <package id="NFluent" version="1.3.1.0" targetFramework="net45" />
   <package id="NUnit" version="3.6.1" targetFramework="net45" />
   <package id="NUnit.ConsoleRunner" version="3.6.1" targetFramework="net45" />
-</packages>
+</packages>

Value/EqualByValues.cs

@@ -0,0 +1,41 @@
+
+namespace Value.Shared
+{
+    using System.Collections.Generic;
+
+    /// <summary>
+    /// Determines two collections are equal by values, i.e. ignoring the order of an elements,
+    /// but the exact elements contained.
+    /// </summary>
+    public class EqualByValues<T>  
+    {
+        private IEnumerable<T> _first;
+        private IEnumerable<T> _second;
+
+        public EqualByValues(IEnumerable<T> first, IEnumerable<T> second)
+        {
+            _first = first;
+            _second = second;
+        }
+
+        public bool Value()
+        {
+            bool ret = true;
+            HashSet<T> set = new HashSet<T>(_first);
+            foreach (var item in _second)
+            {
+                if (!set.Contains(item))
+                {
+                    ret = false;
+                    break;
+                }
+            }
+            return ret;
+        }
+
+        public static implicit operator bool(EqualByValues<T> equalByValues)
+        {
+            return equalByValues.Value();
+        }
+    }
+}

Value/Value.Shared.projitems

@@ -13,6 +13,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)EquatableByValue.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)EquatableByValueWithoutOrder.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ListByValue.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)EqualByValues.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SetByValue.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ValueType.cs" />
   </ItemGroup>