我试图在Visual Studio 2010专业版项目中安装SignalR,但是我遇到了这个错误:
Could not install package 'Microsoft.Owin.Security 2.1.0'. You are trying to install this package into a project that targets '
.NETFramework,Version=v4.0', but the package does not contain any assembly references or content files that are compatible with that framework. F
or more information, contact the package author.