make CNTKLibraryCSEvalExampletest project optional for build

use the same conditional compilation pattern as in C++

Tests/EndToEndTests/EvalClientTests/CNTKLibraryCSEvalExamplesTest/CNTKLibraryCSEvalExamplesTest.csproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="14.0" DefaultTargets="Build" InitialTargets="CheckDependencies" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -63,7 +63,7 @@
     <Reference Include="System" />
     <Reference Include="System.Drawing" />
   </ItemGroup>
-  <ItemGroup Condition="Exists('$(SWIG_PATH)\swig.exe')">
+  <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
@@ -84,7 +84,11 @@
     </Compile>
     <Compile Include="Program.cs" />
   </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" Condition="Exists('$(SWIG_PATH)\swig.exe')" />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Target Name="Build" Condition="Exists('$(SWIG_PATH)\swig.exe')" DependsOnTargets="$(BuildDependsOn)" />
+  <Target Name="CheckDependencies">
+    <Warning Condition="!Exists('$(SWIG_PATH)\swig.exe')" Text="The project requires SWIG to be installed. Please see https://github.com/Microsoft/CNTK/wiki/Setup-CNTK-on-Windows#optional-cntk-cnet-library-for-evaluation for installation instructions." />
+  </Target>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">

bindings/csharp/CNTKLibraryManagedDll/CNTKLibraryManagedDll.csproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="14.0" DefaultTargets="Build" InitialTargets="CheckDependencies" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -63,7 +63,7 @@
     <Reference Include="System" />
     <Reference Include="System.Drawing" />
   </ItemGroup>
-  <ItemGroup Condition="Exists('$(SWIG_PATH)\swig.exe')">
+  <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
@@ -98,10 +98,11 @@
     <Compile Include="SwigProxyClasses\VariableKind.cs" />
     <Compile Include="SwigProxyClasses\VariableVector.cs" />
   </ItemGroup>
-  <Target Name="Build" Condition="!Exists('$(SWIG_PATH)\swig.exe')">
-    <Warning Condition="!Exists('$(SWIG_PATH)\swig.exe')" Text="The project requires SWIG to be installed." />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Target Name="Build" Condition="Exists('$(SWIG_PATH)\swig.exe')" DependsOnTargets="$(BuildDependsOn)" />
+  <Target Name="CheckDependencies">
+    <Warning Condition="!Exists('$(SWIG_PATH)\swig.exe')" Text="The project requires SWIG to be installed. Please see https://github.com/Microsoft/CNTK/wiki/Setup-CNTK-on-Windows#optional-cntk-cnet-library-for-evaluation for installation instructions." />
   </Target>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" Condition="Exists('$(SWIG_PATH)\swig.exe')" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">

bindings/csharp/Swig/CNTKLibraryCSBinding.vcxproj

@@ -101,7 +101,7 @@
   </ItemDefinitionGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup />
-  <ItemGroup Condition="$(HasSwig)">
+  <ItemGroup>
     <CustomBuild Include="cntk_cs.i">
       <FileType>Document</FileType>
       <Command>$(SWIG_PATH)\swig.exe -c++ -csharp -DMSC_VER -I$(SolutionDir)Source\CNTKv2LibraryDll\API -I$(SolutionDir)bindings\common -namespace CNTK -outdir  $(SolutionDir)bindings\csharp\CNTKLibraryManagedDll\SwigProxyClasses -dllimport CNTKLibraryCSBinding cntk_cs.i</Command>
@@ -109,10 +109,10 @@
       <AdditionalInputs>$(SolutionDir)Source\CNTKv2LibraryDll\API\CNTKLibrary.h;$(SolutionDir)bindings\common\CNTKValueExtend.i;std_unordered_map.i</AdditionalInputs>
     </CustomBuild>
   </ItemGroup>
-  <ItemGroup Condition="$(HasSwig)">
+  <ItemGroup>
     <ClCompile Include="cntk_cs_wrap.cxx" />
   </ItemGroup>
-  <ItemGroup Condition="$(HasSwig)">
+  <ItemGroup>
     <ClInclude Include="..\..\..\Source\CNTKv2LibraryDll\API\CNTKLibrary.h" />
     <ClInclude Include="..\..\..\Source\CNTKv2LibraryDll\API\CNTKLibraryInternals.h" />
     <ClInclude Include="cntk_cs_wrap.h" />
@@ -120,9 +120,10 @@
   <ItemGroup>
     <None Include="..\..\common\CNTKValueExtend.i" />
   </ItemGroup>
-  <Target Name="CheckDependencies" Condition="!$(HasSwig)">
-    <Warning Condition="!$(HasSwig)" Text="The project requires SWIG to be installed." />
+  <Target Name="CheckDependencies">
+    <Warning Condition="!$(HasSwig)" Text="The project requires SWIG to be installed. Please see https://github.com/Microsoft/CNTK/wiki/Setup-CNTK-on-Windows#optional-cntk-cnet-library-for-evaluation for installation instructions." />
   </Target>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <Target Name="Build" Condition="$(HasSwig)" Outputs="$(TargetPath)" DependsOnTargets="$(BuildDependsOn)" />
   <ImportGroup Label="ExtensionTargets" />
 </Project>