CODEWITHSUNDEEP
c#.netasynchronous
Darkterror_jl
Darkterror_jl

Reputation: 63

confusion about asynchronous programming

class Program
{
    public delegate void ss(string s);

    public static void print(string s)
    {
        Console.WriteLine("asynchronous thread..."+s+DateTime.Now.ToLongTimeString());
        System.Threading.Thread.Sleep(3000);
    }

    static void Main(string[] args)
    {
        ss s = print;

        Console.WriteLine("Main thread..." + DateTime.Now.ToLongTimeString());

        IAsyncResult result = s.BeginInvoke("hello", null, null);

        for (int i = 0; i < 50; i++)
        {
            Console.WriteLine("Main...thread..."+DateTime.Now.ToLongTimeString());
        }

        System.Threading.Thread.Sleep(3000);

        Console.WriteLine("Main...thread...after sleep" + DateTime.Now.ToLongTimeString());
        Console.WriteLine("Main...thread...after sleep..." + DateTime.Now.ToLongTimeString());

        s.EndInvoke(result);

Output is:

Main thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
**asynchronous thread...hello 4:20:01 PM**  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
Main...thread...4:20:01 PM  
**Main...thread...after sleep4:20:04 PM**  
**Main...thread...after sleep...4:20:04 PM**

My question is why sleep method doesn't count in asynchronous method?

Upvotes: 0

Views: 82

Answers (1)

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236218

My question is why sleep method doesn't count in asynchronous method?

It does encounter. After writing line asynchronous thread...hello 4:20:01 PM your background thread goes to sleep, but main thread continues to print messages. Add message after background thread has awaken to see that Sleep worked:

public static void print(string s)
{
    Console.WriteLine("async thread..." + s + DateTime.Now.ToString("T"));
    System.Threading.Thread.Sleep(2000);
    Console.WriteLine("async thread after sleep " + DateTime.Now.ToString("T"));
}

Upvotes: 1

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