未能加载文件或程序集

　　

问题如图，

解决方法如下：

 <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
     
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.AspNet.SignalR.Core" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.2.1.0" newVersion="2.2.1.0" />
      </dependentAssembly>

    </assemblyBinding>
  </runtime>