From 770a989e1a3872cfdc16b222772e71d3a3f03a77 Mon Sep 17 00:00:00 2001
From: chaowlert <chaowlert@gmail.com>
Date: Tue, 5 Feb 2019 08:52:49 +0700
Subject: [PATCH] fix: map to target from null value should return null

---
 src/Mapster.Tests/Mapster.Tests.csproj |  1 +
 src/Mapster.Tests/WhenMappingArrays.cs | 11 +++++++++++
 src/Mapster/Adapters/BaseAdapter.cs    |  2 +-
 src/Mapster/Mapster.csproj             |  4 ++--
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/Mapster.Tests/Mapster.Tests.csproj b/src/Mapster.Tests/Mapster.Tests.csproj
index e32640ca..a8795088 100644
--- a/src/Mapster.Tests/Mapster.Tests.csproj
+++ b/src/Mapster.Tests/Mapster.Tests.csproj
@@ -9,6 +9,7 @@
         <PublicSign Condition=" '$(OS)' != 'Windows_NT' ">true</PublicSign>
     </PropertyGroup>
     <ItemGroup>
+        <PackageReference Include="ExpressionDebugger" Version="2.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
         <PackageReference Include="MSTest.TestAdapter" Version="1.4.0" />
         <PackageReference Include="MSTest.TestFramework" Version="1.4.0" />
diff --git a/src/Mapster.Tests/WhenMappingArrays.cs b/src/Mapster.Tests/WhenMappingArrays.cs
index 7e72402a..c42ed8fe 100644
--- a/src/Mapster.Tests/WhenMappingArrays.cs
+++ b/src/Mapster.Tests/WhenMappingArrays.cs
@@ -2,6 +2,7 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Shouldly;
 using System.Collections.Generic;
+using System.Linq.Expressions;
 
 namespace Mapster.Tests
 {
@@ -22,6 +23,16 @@ public void Single_Dimensional_Array_Is_Mapped()
             target.Ints.ShouldBe(source.Ints);
         }
 
+        [TestMethod]
+        public void MapToTarget_With_Null_Value()
+        {
+            var source = new FooArray { Ints = null };
+            var target = new BarArray { Ints = new int[] { 1, 2, 3, 4, 5 } };
+
+            TypeAdapter.Adapt(source, target);
+            target.Ints.ShouldBeNull();
+        }
+
         [TestMethod]
         public void Multi_Dimensional_Array_Is_Mapped()
         {
diff --git a/src/Mapster/Adapters/BaseAdapter.cs b/src/Mapster/Adapters/BaseAdapter.cs
index 6e388bbb..db6d167b 100644
--- a/src/Mapster/Adapters/BaseAdapter.cs
+++ b/src/Mapster/Adapters/BaseAdapter.cs
@@ -185,7 +185,7 @@ protected Expression CreateBlockExpressionBody(Expression source, Expression des
                     var compareNull = Expression.Equal(source, Expression.Constant(null, source.Type));
                     set = Expression.IfThenElse(
                         compareNull,
-                        Expression.Assign(result, destination ?? arg.DestinationType.CreateDefault()),
+                        Expression.Assign(result, arg.DestinationType.CreateDefault()),
                         set);
                 }
             }
diff --git a/src/Mapster/Mapster.csproj b/src/Mapster/Mapster.csproj
index b521b5d8..87d37ef9 100644
--- a/src/Mapster/Mapster.csproj
+++ b/src/Mapster/Mapster.csproj
@@ -16,9 +16,9 @@
         <PackageLicenseUrl>https://github.com/MapsterMapper/Mapster/blob/master/LICENSE</PackageLicenseUrl>
         <NetStandardImplicitPackageVersion Condition=" '$(TargetFramework)' == 'netstandard1.3' ">1.6.1</NetStandardImplicitPackageVersion>
         <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
-        <Version>3.3.0</Version>
+        <Version>3.3.1</Version>
         <RootNamespace>Mapster</RootNamespace>
-        <AssemblyVersion>3.3.0.0</AssemblyVersion>
+        <AssemblyVersion>3.3.1.0</AssemblyVersion>
     </PropertyGroup>
     <ItemGroup Condition="'$(TargetFramework)' == 'net40'">
         <Reference Include="Microsoft.CSharp" />