如何在异步方法中休眠或阻止执行。 Thread.Sleep 不起作用

Question

I have an async method that has a signature like:

public static async void Run(..)
{
  //..
  var responseMessage = await client.PostAsync(..);
  // ..
   using (Stream stream = await responseMessage.Content.ReadAsStreamAsync())
   //...

   Thread.Sleep(5000);
}

I can this method inside of my console app like this:

 static async Task Main(string[] args)
 {
     for(int x = 1; x < 100; x++)
     {
        Run(...);
     }  
 }

I want to block/sleep inside of my Run method because of rate limiting, how can I do this?

I tried this:

 public static async void Run(...)
    {
      // ...
       Thread.Sleep(5000);
    }

But this didn't seem to do anything. Can someone explain why this didn't work and the correct way?

Answer 1

You need to use Task.Delay when using the async pattern:

static async Task Main(string[] args)
{
   for(int x = 1; x < 100; x++)
   {
      await Run(...);
   }  
}

public static async Task Run(...)
{
  // ...
  await Task.Delay(5000);
}

NOTE: I've also changed your Run method to be async so that it can be awaited. Also, async void is generally a bad idea and should typically only be done when writing event handlers.