Can't compile ASP.NET 5 Web API when adding XML support - asp.net-core

Question

I'm trying to figure out how ASP.NET 5 Web API supports Content Negotiation. In order to support XML (in addition to the default JSON support), according to another answer here on Stack Overflow, I need to add that support from an optional NuGet package.
Things have changed a bit since that answer, but I pulled down the Microsoft.AspNet.Mvc.Xml package and edited my Startup.cs file:
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddMvc().AddMvcOptions(options =>
{
options.InputFormatters.Add(new XmlSerializerInputFormatter());
});
}
This, however, doesn't compile:
The type 'InputFormatter' is defined in an assembly that is not referenced. You must add a reference to assembly 'Microsoft.AspNet.Mvc.Core, Version=6.0.0.0, Culture=neutral, PublicKeyToken=null'.
Here are the full compilation error messages:
1>C:\Users\mark\Desktop\WebApplication1\src\WebApplication1\Startup.cs(33,17,33,44): DNX 4.5.1 error CS0012: The type 'InputFormatter' is defined in an assembly that is not referenced. You must add a reference to assembly 'Microsoft.AspNet.Mvc.Core, Version=6.0.0.0, Culture=neutral, PublicKeyToken=null'.
1>C:\Users\mark\Desktop\WebApplication1\src\WebApplication1\Startup.cs(33,45,33,78): DNX 4.5.1 error CS1503: Argument 1: cannot convert from 'Microsoft.AspNet.Mvc.Xml.XmlSerializerInputFormatter' to 'Microsoft.AspNet.Mvc.Formatters.IInputFormatter'
1>C:\Users\mark\Desktop\WebApplication1\src\WebApplication1\Startup.cs(33,17,33,44): DNX Core 5.0 error CS0012: The type 'InputFormatter' is defined in an assembly that is not referenced. You must add a reference to assembly 'Microsoft.AspNet.Mvc.Core, Version=6.0.0.0, Culture=neutral, PublicKeyToken=null'.
1>C:\Users\mark\Desktop\WebApplication1\src\WebApplication1\Startup.cs(33,45,33,78): DNX Core 5.0 error CS1503: Argument 1: cannot convert from 'Microsoft.AspNet.Mvc.Xml.XmlSerializerInputFormatter' to 'Microsoft.AspNet.Mvc.Formatters.IInputFormatter'
The error message seems fairly clear, but the project already includes Microsoft.AspNet.Mvc.Core, although not quite in the desired version:
Id Versions
-- --------
Microsoft.AspNet.IISPlatformHandler {1.0.0-rc1-final}
Microsoft.AspNet.Mvc {6.0.0-rc1-final}
Microsoft.AspNet.Mvc.Core {6.0.0-rc1-final}
Microsoft.AspNet.Mvc.Xml {6.0.0-beta5}
Microsoft.AspNet.Server.Kestrel {1.0.0-rc1-final}
Microsoft.AspNet.StaticFiles {1.0.0-rc1-final}
Microsoft.Extensions.Configurati... {1.0.0-rc1-final}
Microsoft.Extensions.Configurati... {1.0.0-rc1-final}
Microsoft.Extensions.Logging {1.0.0-rc1-final}
Microsoft.Extensions.Logging.Con... {1.0.0-rc1-final}
Microsoft.Extensions.Logging.Debug {1.0.0-rc1-final}
As I'm writing this, ASP.NET 5 is only available in a Release Candidate version, so the above packages are the most recent available.
Clearly, Microsoft.AspNet.Mvc.Core 6.0.0.0 isn't available. In a normal .NET project, I'd attempt to solve this issue with a binding redirect, but since this is ASP.NET 5, that's apparently no longer the way to do things.
How can I make my code compile?

Answer 1

I believe you have to use the Microsoft.AspNet.Mvc.Formatters.Xml package instead. Also see this issue on github.
Also a hot tip: Use http://packagesearch.azurewebsites.net/ to search for which NuGet-package contains the class you are looking for.