找不到类型或命名空间 IAppBuilder(缺少使用指令和程序集引用) [英] The type or namespace IAppBuilder could not be found(missing using a directive pr an assembly reference)

问题描述

我正在开发一个 Asp.Net MVC 4 应用程序，我在其中使用 SignalR 2.0.1 并使用 Owin Startup 类对其进行了映射，并且起初运行良好.

I am working on an Asp.Net MVC 4 Application in which I am using SignalR 2.0.1 and I Mapped it using Owin Startup class and it worked fine at first.

突然当我试图重建我的应用程序时，它说类型是命名空间 IAppbuilder 找不到.

All of a sudden when I tried to rebuild my app it said that the type are namespace IAppbuilder could not be found.

以下是我的入门课

using Microsoft.Owin;
using Owin;
using WhiteBoardApp;

namespace WhiteBoardApp
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }
    }
}

我也安装了 Owin 包，但由于某些原因我找不到 Owin Startup 类，所以我只添加了一个普通类并包含了所有需要的引用.请问我哪里出错了

I have installed Owin package too, and for some reasons I could not find Owin Startup class so I just added a normal class and included all the references that are needed. May I know where I am making a mistake

推荐答案

尝试使用 Package Manage Console 并执行

Try to use Package Manage Console and do

Update-Package Owin -Reinstall

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