.net asynchronus programming guide

Question

i`v been studing about async progrmaming in .net today and what i understood is that this code Should NOT create a new thread but i see different ThreadId with calling Thread.CurrentThread.ManagedThreadId.

  static void Main(string[] args)
    {
        Do();
        Console.WriteLine("Main {0}",Thread.CurrentThread.ManagedThreadId);

        Thread.Sleep(400);
    }

    private static async void Do()
    {
        Task<string> task = new StreamReader(@"D:\a.txt").ReadLineAsync();
        string result = await task;
        Console.WriteLine("DO {0}", Thread.CurrentThread.ManagedThreadId);
    }

thanks everyone for reading this..

This article had a good explanation: gamlor.info/wordpress/2010/10/… — Baldrick
– Baldrick, Commented Dec 7, 2013 at 13:33
@user2924454: I have an async intro on my blog that you may find helpful; I tried to make it an intro that covers everything you need to know in a single post, with detailed followup links at the bottom. — Stephen Cleary
– Stephen Cleary, Commented Dec 7, 2013 at 15:44

user1937198 · Accepted Answer · 2013-12-07 13:30:25Z

4

The reason your getting different thread ids is that you have created a console app. On a UI app there is a special SynchronizationContext saying that the callbacks should be on the UI thread. Console apps don't have this synchronization context as the console methods are thread safe so don.t need to be called on the main thread. This means that an async call on the the main thread behaves the same as on any user created threads would which is to fire callbacks to the thread pool as your seeing.

answered Dec 7, 2013 at 13:30

user1937198

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user1937198 Over a year ago

Is a console app so it behaves like a user created thread would in a UI app.

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