Strong-name sign WiX assemblies.

global.json

@@ -1,5 +1,5 @@
 {
   "msbuild-sdks": {
-    "WixToolset.Sdk": "4.0.0-build-0162"
+    "WixToolset.Sdk": "4.0.0-build-0163"
   }
 }

src/CSharp.Build.props

@@ -0,0 +1,11 @@
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<!--
+  Do NOT modify this file. Update the canonical version in Home\repo-template\src\CSharp.Build.props
+  then update all of the repos.
+-->
+<Project>
+  <PropertyGroup>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>$([System.IO.Path]::GetFullPath($(MSBuildThisFileDirectory)wix.snk))</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
+</Project>

src/Directory.Build.props

@@ -22,6 +22,7 @@
     <Product>WiX Toolset</Product>
   </PropertyGroup>
 
+  <Import Project="CSharp.Build.props" Condition=" '$(MSBuildProjectExtension)'=='.csproj' and Exists('CSharp.Build.props') " />
   <Import Project="Cpp.Build.props" Condition=" Exists('Cpp.Build.props') And '$(MSBuildProjectExtension)'=='.vcxproj' " />
   <Import Project="Wix.Build.props" Condition=" Exists('Wix.Build.props') And '$(MSBuildProjectExtension)'=='.wixproj' " />
   <Import Project="Custom.Build.props" Condition=" Exists('Custom.Build.props') " />