找不到OWIN HttpListener

Question

当我尝试开始时:

WebApp.Start<SrvcHst>(new StartOptions { Port = 9956, 
     ServerFactory = "Microsoft.Owin.Host.HttpListener" });

我得到以下异常.可能是根本原因？

System.MissingMemberException was caught
  HResult=-2146233070
  Message=The server factory could not be located for the given input: Microsoft.Owin.Host.HttpListener
  Source=Microsoft.Owin.Hosting
  StackTrace:
       at Microsoft.Owin.Hosting.Engine.HostingEngine.ResolveServerFactory(StartContext context)
       at Microsoft.Owin.Hosting.Engine.HostingEngine.Start(StartContext context)
       at Microsoft.Owin.Hosting.Starter.DirectHostingStarter.Start(StartOptions options)
       at Microsoft.Owin.Hosting.Starter.HostingStarter.Start(StartOptions options)
       at Microsoft.Owin.Hosting.WebApp.StartImplementation(IServiceProvider services, StartOptions options)
       at Microsoft.Owin.Hosting.WebApp.Start(StartOptions options)
       at Microsoft.Owin.Hosting.WebApp.Start[TStartup](StartOptions options)

Answer 1

您必须Microsoft.Owin.Host.HttpListener.dll在项目参考中包含.

您可以通过NuGet添加它.

但是,如果代码执行:

WebApp.Start<SrvcHst> (...);

包含在类库中,确保使用该库的可执行文件还包含对该程序的引用Microsoft.Owin.Host.HttpListener.dll,否则它将不会与您的程序一起部署,因为类库中没有对它的显式引用.

看看你的bin/Debug文件夹,确保DLL在那里.

Answer 2

确保你有安装包 Microsoft.Owin.Host.HttpListener

要安装包,请使用以下命令行:

Install-Package Microsoft.Owin.Host.HttpListener

Answer 3

有时NuGet引用是以不完整的状态添加的.如果您安装了软件包,但不包括引用,请尝试通过以下方式重新安装它们;

Update-Package -reinstall

在包管理器控制台中.