blocks|key|155566|text|尝试使用包管理控制台并执行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|155567|Update-Package+Owin+-Reinstall|code-block|syntax|javascript|155568|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try to use Package Manage Console and do 

<pre><code>Update-Package Owin -Reinstall
</code></pre>

blocks|key|4661905|text|下面在F#中使用的等价物提出了一个隐藏IAppBuilder的问题。事实证明，Owin规定被解释为不完整的System.Web.Http.Owin引用，即使提供Owin名称空间的Owin.dll被引用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4661906|open+System.Net.Http
open+System.Web.Http
open+Microsoft.Owin
open+Owin|code-block|syntax|javascript|4661907|通过按如下方式重新安排用法，解决了该问题：|4661908|open+Microsoft.Owin
open+Owin
open+System.Net.Http
open+System.Web.Http|4661909|...granted，这可能是F#编译器特有的错误，在C#和其他地方可以更好地处理名称冲突。|4661910|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

My following using's equivalent in F# present a problem of hiding the IAppBuilder. It turns out that the Owin stipulation was being interpreted as an incomplete System.Web.Http.Owin reference, even though the Owin.dll providing the Owin namespace was referenced.

<pre><code>open System.Net.Http
open System.Web.Http
open Microsoft.Owin
open Owin
</code></pre>

The problem was resolved by rearranging the usings as follows:

<pre><code>open Microsoft.Owin
open Owin
open System.Net.Http
open System.Web.Http
</code></pre>

...granted, this may be a bug peculiar to the F# compiler and name conflicts are handle better in C# and elsewhere.

blocks|key|4661952|text|我也有类似的问题。但显然，问题是导致Microsoft.Owin的原因|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4661953|Update-Package+Owin+-Reinstall|code-block|syntax|javascript|4661954|没有用，Update-Package+Owin也没有用|offset|length|style|CODE|4661955|但|4661956|Install-Package+Microsoft.Owin|4661957|对我来说很好，谢谢。|4661958|entityMap^0|0|0|4|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

I was having similar issue. But instead Owin, problem was causing Microsoft.Owin, obviously 

<pre><code>Update-Package Owin -Reinstall
</code></pre>

Didn't work, neither did <code>Update-Package Owin</code>

BUT

<pre><code>Install-Package Microsoft.Owin
</code></pre>

did work fine for me, thanks.

blocks|key|4662020|text|由于某种原因，我的Visual+Studio+2013没有意识到引用路径的存在。引用前面的黄色感叹号显示了所有添加的包。我检查了../packages/，但所有文件都存在，我还打开了引用正确路径的.csproj文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4662021|关闭和打开解决方案返回了相当多的错误，并且无法加载解决方案中包含的项目。|4662022|重新启动Visual+Studio+2013拯救了这一天，原因不明。|4662023|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

My Visual Studio 2013 for some reason didn't realize that the references paths existed. The yellow exclamation mark in front of the references was shown for all the added packages. I checked ../packages/ but all files existed, i also opened the .csproj file which referenced the correct paths.

Closing and opening the solution returned quite a lot of errors, and could not load the projects included in the solution.

Restarting Visual Studio 2013 saved the day for some unexplained reason.

blocks|key|4662070|text|http://www.asp.net/signalr/overview/getting-started/tutorial-getting-started-with-signalr|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4662071|检查您正在使用的visual+studio，您可以找到以下注释|4662072|注意:如果您使用的是Visual+Studio2012，则SignalR中心类(v2)模板将不可用。您可以添加一个名为ChatHub的普通类。|4662073|另请注意:如果您使用的是Visual+Studio+2012，则OWIN启动类模板将不可用。您可以添加一个名为Startup的普通类。|4662074|entityMap|0|LINK|mutability|MUTABLE|url^0|0|2H|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|4]]]]

<a href="http://www.asp.net/signalr/overview/getting-started/tutorial-getting-started-with-signalr" rel="nofollow">http://www.asp.net/signalr/overview/getting-started/tutorial-getting-started-with-signalr</a>

Check for the visual studio you are using
You can find the following comment

Note: If you are using Visual Studio 2012, the SignalR Hub Class (v2) template will not be available. You can add a plain Class called ChatHub instead.

Also
Note: If you are using Visual Studio 2012, the OWIN Startup Class template will not be available. You can add a plain Class called Startup instead.

blocks|key|4662147|text|这是一个排序问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4662148|using+Microsoft.Owin;
using+Owin;|code-block|syntax|javascript|4662149|导致首先定义Microsoft.Owin，然后在已经导入的微软命名空间下找到Owin。如果你将鼠标移到使用Owin的Owin上，你应该会看到它再次被解析为Microsoft.Owin，而且集成开发环境将会灰显，使用Owin作为多余的未使用的引用。|4662150|执行以下操作：|4662151|using+global::Owin;|4662152|这澄清了编译器不会在已经定义的命名空间(例如，Microsoft.命名空间)。|4662153|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

It's an ordering issue.

<pre><code>using Microsoft.Owin;
using Owin;
</code></pre>

Leads to Microsoft.Owin to be defined first, then Owin is found under already imported Microsoft namespace. If you mouse over Owin of using Owin you should see it was resolved to Microsoft.Owin again and furthermore IDE will gray out using Owin as redundant unused reference.

Do:

<pre><code>using global::Owin;
</code></pre>

Which clarifies for the compiler not to look for Owin under already defined namespaces (e.g. Microsoft. namespace).

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.

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

Following is my start up class

<pre><code>using Microsoft.Owin;
using Owin;
using WhiteBoardApp;

namespace WhiteBoardApp
{
 public class Startup
 {
 public void Configuration(IAppBuilder app)
 {
 app.MapSignalR();
 }
 }
}
</code></pre>

I have installed <code>Owin</code> 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

The type or namespace IAppBuilder could not be found(missing using a directive pr an assembly reference)

集成开发环境

Visual Studio

编译器

我正在开发一个Asp.Net MVC4应用程序，其中我使用的是SignalR 2.0.1，我使用Owin启动类对其进行了映射，它一开始工作得很好。突然，当我尝试重新构建我的应用程序时，它告诉我的类型是命名空间IAppbuilder找不到。下面是我的启动课using Microsoft.Owin;using Owin;u...

问找不到类型或命名空间IAppBuilder (使用指令取消程序集引用时丢失)
EN

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