Could not load file or assembly ‘System.Threading.Tasks, Version=1.5.11.0‘解决方法

最近做了C#调用Redis功能，在本地开发时没问题，但是发到了生产就报错，

错误信息：

Could not load file or assembly 'System.Threading.Tasks, Version=1.5.11.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

在网上找了很多方法没有解决，

其中也加了runtime

<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Runtime" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.6.10.0" newVersion="2.6.10.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Threading.Tasks" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.6.10.0" newVersion="2.6.10.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

加了以上节点也不行

然后在服务器上安装了.netframework4.5.2，问题解决了。

去官方下载：NDP452-KB2901907-x86-x64-AllOS-ENU.exe