依赖关系不匹配：解决方案不会使用4.0.0.0以上的版本

Question

When I try to run the solution, I'll get an error: Could not load file or assembly 'System.Net.Http, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. Could not load file or assembly 'System.Net.Http, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

System.Net.Http version 4.0.0 is always in use. I have tried to update, downgrade and god knows what for hours now. Nothing I've tried works.

This is my project.json:

{
  "dependencies": {
    "Microsoft.AspNetCore.Mvc": "1.0.1",
    "Microsoft.AspNetCore.Routing": "1.0.1",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.2",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.2",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.1.2",
    "Microsoft.Extensions.Configuration.Json": "1.1.2",
    "Microsoft.Extensions.Configuration.UserSecrets": "1.1.2",
    "Microsoft.Extensions.Logging": "1.1.2",
    "Microsoft.Extensions.Logging.Console": "1.1.2",
    "Microsoft.Extensions.Logging.Debug": "1.1.2",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.2",
    "Microsoft.ServiceFabric": "5.6.220",
    "Microsoft.ServiceFabric.AspNetCore.WebListener": "2.6.220",
    "Microsoft.ServiceFabric.Data": "2.6.220",
    "Microsoft.ServiceFabric.Services": "2.6.220",
    "Microsoft.AspNetCore.Mvc.Formatters.Xml": "1.0.1",
    "Microsoft.AspNetCore.Authentication.Cookies": "1.1.1",
    "microsoft.aspnetcore.authentication.jwtbearer": "1.1.1",
    "System.Net.Http": "4.3.2"
  },

  "tools": {
  },

  "frameworks": {
    "net461": {}

  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "**/*.cshtml",
      "appsettings.json",
      "web.config"
    ]
  },

  "scripts": {
  }
}

In there I have written "System.Net.Http": "4.3.2" , but as you can see in this image, the reference version is 4.0.0:

What am I doing wrong and how can I fix it? I'm getting a bit confused. I declare 4.3.2, the reference is 4.0.0 and the error says 4.1.1? I have searched everywhere for version 4.1.1, but didn't find anything.

Edit: I'm using VS 2015 on a windows 7 machine.

I have also tried to redirect to the correct assembly version in the config json file with no success.

Answer 1

For whatever reason VS 2015 would fallback to v4.0.0 of System.Net.Http if multiple package versions were used. What you could do is:

1. Upgrade your .NET Core projects to v1.1 and use VS 2017.
2. Remove Microsoft.AspNetCore.Authentication.JwtBearer which has a dependency on System.Net.Http v4.0.0.

If Microsoft.AspNetCore.Authentication.JwtBearer is needed in your project, then #1 might be the only option.

Answer 2

Reference the latest version of System.Net.Http and add to your app.config bindingRedirect like that:

<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.1.0.0" newVersion="4.1.1.0" />
       </dependentAssembly>
       <!-- Other possible redirects... -->
    </assemblyBinding>
 </runtime>

Please adjust the version and other values in my redirect if needed.

At least that's how it worked before, may be in .Net Core something changed, in that case, you at least have an idea of what to do now.