It needs the system.web.http.webhost which is part of this package. I fixed this by installing the following package:
PM> Install-Package Microsoft.AspNet.WebApi.WebHost
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It needs the system.web.http.webhost which is part of this package. I fixed this by installing the following package:
PM> Install-Package Microsoft.AspNet.WebApi.WebHost
转载于:https://www.cnblogs.com/haoliansheng/p/4730405.html