使用 AsyncWaitHandle.WaitOne 在 C# 中执行一行之前添加延迟

Question

I want to execute a function after some 2 seconds delay in C#

I tried the below code

IAsyncResult result;
Action action = () =>
{
    //I want to call my function here after 1 second delay
    Console.WriteLine("Delayed logging");
};

result = action.BeginInvoke(null, null);
if (result.AsyncWaitHandle.WaitOne(500000))
    Console.WriteLine("Completed");
else
    Console.WriteLine("done");

But it doesn't seem to work

Here is the fiddle

I just want to navigate to a different page after showing some alert message to user

Answer 1

Unless there's a lot more to what you're actually trying to do, messing around with IAsyncResult , Action , and BeginInvoke is massive overkill. All you need to do is:

Thread.Sleep(1000);
// call your funcction

Answer 2

As already proposed, you can use the System.Threading.Thread.Sleep method to delay your call:

public static void Main()
{

    IAsyncResult result;
    Stopwatch sw = new Stopwatch();
    sw.Start();
    Action action = () =>
    {
        Thread.Sleep(1000);
        //I want to call my function here after 1 second delay
        Console.WriteLine("Delayed logging");
    };

    result = action.BeginInvoke(null, null);
    if (result.AsyncWaitHandle.WaitOne(500000))
        Console.WriteLine("Completed");
    else
        Console.WriteLine("done");

    sw.Stop();
    Console.WriteLine(sw.ElapsedMilliseconds.ToString());
}

Output:

Delayed logging
Completed
1000