Scaffolding: net461 version of dotnet-aspnet-codegenerator-design.exe should be built for multiple platforms instead of win7-x86

[prafullbhosale]

For a net461 project with RID as win7-x64, the dotnet-aspnet-codegenerator-design.exe causes exception as MVC tries to load the 32-bit assembly in a 64-bit process:

System.BadImageFormatException occurred
  HResult=0x8007000B
  Message=Could not load file or assembly 'dotnet-aspnet-codegenerator-design' or one of its dependencies. An attempt was made to load a program with an incorrect format.
  Source=mscorlib 

Sample project:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net461</TargetFramework>
    <RuntimeIdentifier>win7-x64</RuntimeIdentifier>
  </PropertyGroup>

  <ItemGroup>
    <Folder Include="wwwroot\" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="2.0.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.0.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Formatters.Xml" Version="2.0.0" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.0.0" />
  </ItemGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
  </ItemGroup>

</Project>

[prafullbhosale]

cc @Eilon @mlorbetske

[Eilon]

cc @pranavkm because MVC is in the mix here.

[pranavkm]

I might have been on an email thread related to this. The PR for this looks good.

[Eilon]

This patch bug is approved for the 2.0.x patch. Please send a PR to the feature/2.0.1 branch and get it reviewed and merged. When we have the rel/2.0.1 branches ready please port the commit to that branch.

[tjrobinson]

@Eilon Is there a workaround in the meantime?

[tjrobinson]

The workaround is to remove the package reference Microsoft.VisualStudio.Web.CodeGeneration.Design (This will disable scaffolding)

From: https://github.com/aspnet/Mvc/issues/6709#issuecomment-324969596

[prafullbhosale]

Fixed by #605