从ASP.NET页面调用异步方法使我等待结果

Question

From my ASP.NET Page I call a method from a referenced project like this:

Dim oValServiceAgent As New ServiceAgents.ValServiceAgent(System.Security.Principal.TokenImpersonationLevel.Impersonation, "ValEndPointName")
Using (CType(HttpContext.Current.User.Identity, System.Security.Principal.WindowsIdentity).Impersonate())
    oValServiceAgent.DoStuffAsync()
End Using

Referenced project ServiceAgents with class valServiceAgent:

public void DoStuffAsync()
{
    //invokes async method using delegates
}

I want the user to be able to navigate to a different page before the DoStuffAsync() is finished. In the current situation this is not possible.

I'm using VS2010 and target .NET framework 3.5

Answer 1

Have you tried calling Request.End() after you start the async process? That will force the current request to end right away. Not sure if that would work but something for you to try.

Note that launching background threads is not a preferable thing to do in web pages since you are not guaranteed that that thread will not be killed before completing what it is trying to complete because of app pool recycling. That thread becomes part of the current application pool and will be at the mercy of it after you kick it off. The approach I prefer is to queue the operation and process it outside of the web application instead. You can use whatever queue framework you would like or even roll your own by writing a record into a table or something.

Answer 2

The problem was in the async method as Falanwe suggested, not in my asp.net code.

Thanks for the suggestions.

Answer 3

Here some points

• async and await keyword methods are .Net 4.5 features.
• async suffix is a convention only for methods that support async

More on async here in .Net 4.5

In .net 3.5 you should use Thread or a BackgroundWorker to create your own asynchronous method.

We need more precision on your async method body to give you further help