[.netcore 2 preview 2] ifileprovider + di error

[AerisG222]

After upgrading to the latest preview release, I am now seeing the following error when starting up the application (via dotnet run):

System.InvalidOperationException: Unable to activate type 'Microsoft.AspNetCore.Mvc.Razor.Internal.FileProviderRazorProject'. The following constructors are ambigious:
Void .ctor(Microsoft.AspNetCore.Mvc.Razor.Internal.IRazorViewEngineFileProviderAccessor)
Void .ctor(Microsoft.Extensions.FileProviders.IFileProvider)

My application registers its own IFileProvider as part of startup, like this (also suggested here: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/file-providers):

.AddSingleton(x => new PhysicalFileProvider(_config["Environment:AssetsPath"]))

If I comment out this line, then everything starts normally, but of course the functionality depending on this does not work.

Should this still work as before?

-- dotnet info:
.NET Command Line Tools (2.0.0-preview2-006497)

Product Information:
Version: 2.0.0-preview2-006497
Commit SHA-1 hash: 06a2093335

Runtime Environment:
OS Name: fedora
OS Version: 25
OS Platform: Linux
RID: fedora.25-x64
Base Path: /opt/dotnet/sdk/2.0.0-preview2-006497/

Microsoft .NET Core Shared Framework Host

Version : 2.0.0-preview2-25407-01
Build : 40c565230930ead58a50719c0ec799df77bddee9

[rynowak]

Thanks for this report. FileProviderRazorProject is a infrastructure type for the view engine, and it has two constructors - the IFileProvider constructor is used for our unit tests. We intend the IRazorViewEngineFileProviderAccessor to be used in product scenarios.

We didn't anticipate this, but it looks like something we'll need to fix in 2.0.0.

For now if you want a workaround, for preview 2 you can add the following to your ConfigureServices

services.AddSingleton<RazorProject>(s => 
{
    return new FileProviderRazorProject(s.GetRequiredService<IRazorViewEngineFileProviderAccessor>());
});

[rynowak]

This is fixed now for 2.0.0 final, thanks again @AerisG222 for the report

[AerisG222]

Thanks!