Why does HttpContext.AcceptWebSocketRequest function make an error when it gets an instance?

Question

According to some samples in the internet and this guide I created a connection of webSocket .

public class sockets: IHttpHandler {

    public bool IsReusable {
        get {
            throw new NotImplementedException();
        }
    }
    public void ProcessRequest(HttpContext context) {
        if (context.IsWebSocketRequest) {
            context.AcceptWebSocketRequest(new socketHandler());
        }
    }
}

public class socketHandler: WebSocketHandler {

    public socketHandler(): base(null) {}
}

There is an error in the line-

context.AcceptWebSocketRequest(new socketHandler());

the error:

Argument 1: cannot convert from 'socketHandler' to 'System.Func(System.Web.WebSockets.AspNetWebSocketContext,System.Threading.Tasks.Task)'

Can anyone help me?

Pieter · Accepted Answer · 2015-06-19 06:29:31Z

4

The AcceptWebSocketRequest takes a method as argument, not a class instance. You code should look something like this:

public void ProcessRequest(HttpContext context) {
    if (context.IsWebSocketRequest) {
        context.AcceptWebSocketRequest(HandleWebSocket);
    }
}

private Task HandleWebSocket(WebSocketContext wsContext)
{
    // Do something useful
}

answered Jun 19, 2015 at 6:29

Pieter

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2 Comments

Adi Malachi Over a year ago

thanks for helping..then the sample in the guide i linked to was wrong? however, in the socketHandler class I implemented the OnOpen, OnMessage etc functions...Now i dont understand when those functions will happen? and more important, when would the onOpen function in the javascript happen?

Pieter Over a year ago

You should take a look at this SO question, one of the answers might suite your needs. stackoverflow.com/questions/25668398/…

MosheG · Accepted Answer · 2016-03-03 13:48:32Z

2

You are referencing a function from System.Web while attempting to use a function from Microsoft.Web.WebSockets.
Add the appropriate reference and it will work.

answered Mar 3, 2016 at 13:48

MosheG

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1 Comment

Charles Owen Over a year ago

Thanks that worked. The tutorial didn't seem to have a code download. This really helped me resolve the issue

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