Questions about the MVC SIGNALR

Just read @Learning hard [SIGNALR chapter of the ASP] topic One: ASP. SIGNALR Quick Start

Follow the steps of the blog, this is the new way of learning

However, the author's development environment and @Learning hard different, resulting in a number of small problems!

First, create a new MVC environment

Author Environment VS2013 +. NET 4.5 + MVC 4.0

The new project selects the Internet application, and in order to support SignalR, use the NuGet console to install SignalR into the project (these are system defaults and have not changed so-called authentication, but I don't know @learning hard And what the network says about identity authentication)

Install-package Microsoft.AspNet.SignalR

Then, the body that needs to be added

Create a new SIGNALR Hub (V2) class file that inherits the Hub class, creating a method that the business logic requires, in this case the main method to apply:

// Call the SendMessage method for all clients Clients.All.sendMessage (name, message);

Finally, the SignalR class is instantiated in the page to do the specific business logic

The code can refer to the "original" part given in the original text.

@section scripts{<!--referencing the SIGNALR library. -<script src="~/scripts/jquery.signalr-2.2.0.min.js"></script> <!--refer to the automatically generated SIGNALR hub (hub) script. When running, you can see the <script src= under browser source"~/signalr/hubs"></script> <script>$ (function () {//referencing the auto-generated hub agent            varChat =$.connection.serverhub; //define client SendMessage for server-side calls to display new messagesChat.client.sendMessage=function (name, message) {//add a message to a page$('#discussion'). Append ('<li><strong>'+HtmlEncode (name)+'</strong>:'+ htmlEncode (message) +'</li>');                       }; //set focus to input box$('#message'). focus (); //start connecting to the server$.connection.hub.start (). Done (function () {$ ('#sendmessage'). Click (function () {//call the Send method of the server-side hubChat.server.send ($ ('#message'). Val ()); //Empty input box information and get focus$('#message'). Val ("'). focus ();            });        });                }); //HTML-encode the displayed messagefunction HtmlEncode (value) {varEncodedvalue = $ ('<div/>'). Text (value). html (); returnEncodedvalue; }    </script>}

Other

The addition of the Controller and the view will not be said, so look at the MVC primer basically.

Here's the problem!

 while attempting to load the app. - No assembly found containing an owinstartupattribute. class  "false"in theclass in your web. config.

After running, it should be a lot of friends have such an error (may be the wrong hint in Chinese)!

Look at the error hint, in fact, directly know what the situation, Owinstartupattribute did not find!

followed by a hint of two approaches, that is, both of these practices mislead beginners!

We follow the prompts, so the search results on the Internet are:

<appSettings>    <add key= "Owin:automaticappstartup" value= "false"/></appsettings>

Hey, you really do not look, incredibly really do not error, but the following problems are bigger, because the world's business logic does not ah, how to, debugging found, browse to the business page, error:

GET http://localhost:10292/signalr/hubs 404 (not Found)

Uncaught Typeerror:cannot Read property ' client ' of undefined

Hey, what is this ...? To search the Internet a lot, and finally searched: https://github.com/SignalR/SignalR/issues/2649

The last @xiaohongt reply gives the correct method, but also the official use of SignalR steps:

Http://www.asp.net/signalr/overview/getting-started/tutorial-getting-started-with-signalr

There is one step:

6. In Solution Explorer, right-click the project, then click Add | OWIN Startup Class. Name the new class Startup and click OK. Note:if you is using Visual Studio, the OWIN Startup Class template is not being available. You can add a plain Class called Startup instead.

Then give the code (note the red):

 using   Microsoft.owin;  using   Owin; [Assembly:owinstartup ( typeof   ( Signalrchat.startup)]]  namespace   signalrchat{ public  class   Startup { public  void   Configuration (Iappbuilder app) { //  any connection or hub wire up and configuration should go here   app.        MAPSIGNALR (); }    }}

Sure enough, when this class is added, the problem is solved and the business function is implemented (remove the error code that was added to the previous web. config)!

Concluding words

Yes, yes, the problem is solved, however ... What the situation, then, there is the following conclusion:

Owin:open Web Interface for. NET

The web frameworks that support Owin are:

• Nancy
• SignalR
• WebApi
• Fubumvc
• Simple.web
• Duovia.http

See also: http://kb.cnblogs.com/page/509236/

Each web framework that uses the Owin component requires a startup entry class to declare the Owin component:

1. The project will automatically scan the class named startup under the root of the assembly as the entry class

2. Mark the entry class by adding a [Assembly:owinstartup (typeof(Signalrchat.startup))] tag

3. If your startup class is not under the current namespace <add key= "Owin:appstartup" value= "[NameSpace]. Startup "/>

4. Because 1th exists, if the class is named Startup and is not an entry point, you need to use <add key= "Owin:automaticappstartup" value= "false"/>

If there is any wrong place, please park friends pointed out, in case misleading new, thank you!

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Questions about the MVC SIGNALR