System.Net.Http 版本冲突导致构建警告

Question

nuget 包 Microsoft.Net.Http.2.0.20710.0 导致我发出构建警告，因为它使用 System.Net.Http, Version=2.0.0.0 与来自另一个包的版本 4 发生冲突。

解决这个问题的最佳方法是什么？ Microsoft.Net.Http.2.0.20710.0 包是否已过时，我应该在我的项目中手动引用 System.Net.Http, Version=4.0.0.0 吗？

构建输出是：

  There was a conflict between "System.Net.Http, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" and "System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
      "System.Net.Http, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was chosen because it was primary and "System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was not.
      References which depend on "System.Net.Http, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [C:\Working\MyProject\packages\Microsoft.Net.Http.2.0.20710.0\lib\net40\System.Net.Http.dll].
          C:\Working\MyProject\packages\Microsoft.Net.Http.2.0.20710.0\lib\net40\System.Net.Http.dll
            Project file item includes which caused reference "C:\Working\MyProject\packages\Microsoft.Net.Http.2.0.20710.0\lib\net40\System.Net.Http.dll".
              System.Net.Http, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL
      References which depend on "System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Net.Http.dll].
          C:\Working\MyProject\packages\Microsoft.AspNet.WebApi.Core.4.0.20710.0\lib\net40\System.Web.Http.dll
            Project file item includes which caused reference "C:\Working\MyProject\packages\Microsoft.AspNet.WebApi.Core.4.0.20710.0\lib\net40\System.Web.Http.dll".
              System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
              System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
          C:\Working\MyProject\packages\Microsoft.AspNet.WebApi.Client.4.0.20710.0\lib\net40\System.Net.Http.Formatting.dll
            Project file item includes which caused reference "C:\Working\MyProject\packages\Microsoft.AspNet.WebApi.Client.4.0.20710.0\lib\net40\System.Net.Http.Formatting.dll".
              System.Web.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
              System.Net.Http.Formatting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
              System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
          C:\Working\MyProject\packages\Microsoft.AspNet.WebApi.WebHost.4.0.20710.0\lib\net40\System.Web.Http.WebHost.dll
            Project file item includes which caused reference "C:\Working\MyProject\packages\Microsoft.AspNet.WebApi.WebHost.4.0.20710.0\lib\net40\System.Web.Http.WebHost.dll".
              System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1578,5): warning MSB3247: Found conflicts between different versions of the same dependent assembly.

Answer 1

您可以尝试this Microsoft Connect bugreport 中提到的解决方法。

或者您可以尝试在您的 Web.config 中添加类似的内容：

  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

编辑：

这是 Connect Bug 中的解决方法：

修改.......：
阅读......：