The use of async await in C # async operation

1. Async with await in pairs appears async is used before method, method decent face with await.

2. Using async and await to define an async method does not create a new thread.

3.await must be a long time to sweep the task, to use Task.run (() =>{}); Similar code to execute.

4. Return to written task<type>. The following code will be executed after this execution is finished.

5. Interface does not block

Example:

Private async void Button2_Click (object sender, EventArgs e)
{
Async methods
this.button2.Enabled = false;

Long length = await accesswebasync ();
This.button2.Enabled = true;
There are some things you can do that don't depend on replies.
Otherwork (); We're going to wait for Accesswebasync to execute after it's done.

This.textBox1.Text + = String.Format ("\ n Reply byte length: {0}.\r\n", length);
Txbmainthreadid.text = Thread.CurrentThread.ManagedThreadId.ToString ();
}

private void Otherwork ()
{
This.textBox1.Text + = "\ r \ n Wait for the server to reply ... \ n".
}

Private async task<long> Accesswebasync ()
{

Await Task.run (() = {Thread.Sleep (5000); Console.WriteLine ("BBB1"); Console.WriteLine ("Bbb2"); Console.WriteLine ("Bbb3"); });
MemoryStream content = new MemoryStream ();
Await Task.run (() =
{
Initiating a Web request to MSDN
HttpWebRequest webRequest = WebRequest.Create ("http://msdn.microsoft.com/zh-cn/") as HttpWebRequest;
if (webRequest! = null)
{
return reply result
using (WebResponse response = Webrequest.getresponse ())
{
using (Stream Responsestream = response. GetResponseStream ())
{
Responsestream.copyto (content);
}
}
}
});

Txbasynmethodid.text = Thread.CurrentThread.ManagedThreadId.ToString ();
return content. Length;
}

The use of async await in C # async operation