How to ".Wait( )" on a ConfiguredTaskAwaitable in C#?

How to ".Wait( )" on a ConfiguredTaskAwaitable in C#?

In C#, you should avoid using the Wait() method on a ConfiguredTaskAwaitable object because it can lead to deadlocks in certain situations. Instead, you can use the GetAwaiter().GetResult() method to block the current thread until the task completes. Here's an example:

public async Task MyAsyncMethod() { await Task.Delay(1000).ConfigureAwait(false); } public void MySyncMethod() { MyAsyncMethod().ConfigureAwait(false).GetAwaiter().GetResult(); }

In this example, we have an asynchronous method called MyAsyncMethod that uses ConfigureAwait(false) to prevent the method from returning to the original synchronization context. We also have a synchronous method called MySyncMethod that calls MyAsyncMethod and blocks the current thread until it completes using GetAwaiter().GetResult().

Note that calling GetAwaiter().GetResult() on a ConfiguredTaskAwaitable object can still lead to deadlocks if the current synchronization context is blocked, so you should use this method with caution. In general, it's recommended to use async/await instead of blocking methods like Wait() and GetAwaiter().GetResult() to prevent deadlocks and improve performance.

Examples

  1. Await on a ConfiguredTaskAwaitable in C#

    • Description: Learn how to use the await keyword to wait for the completion of a ConfiguredTaskAwaitable.
    • Code:
      // Using await to wait for the completion of a ConfiguredTaskAwaitable async Task MyAsyncMethod() { await MyAsyncOperation().ConfigureAwait(false); }

  2. Use Task.Wait on a ConfiguredTaskAwaitable in C#

    • Description: Understand how to use Task.Wait to wait for the completion of a ConfiguredTaskAwaitable.
    • Code:
      // Using Task.Wait to wait for the completion of a ConfiguredTaskAwaitable Task MySyncMethod() { MyAsyncOperation().ConfigureAwait(false).GetAwaiter().GetResult(); }

  3. Synchronously block on ConfiguredTaskAwaitable in C#

    • Description: Learn how to synchronously block and wait for the completion of a ConfiguredTaskAwaitable.
    • Code:
      // Synchronously blocking on ConfiguredTaskAwaitable MyAsyncOperation().ConfigureAwait(false).GetAwaiter().GetResult();

  4. Task.WaitAll with ConfiguredTaskAwaitable in C#

    • Description: Understand how to use Task.WaitAll with ConfiguredTaskAwaitable for waiting on multiple asynchronous operations.
    • Code:
      // Using Task.WaitAll with ConfiguredTaskAwaitable Task.WaitAll(MyAsyncOperation().ConfigureAwait(false), AnotherAsyncOperation().ConfigureAwait(false));

  5. Task.Run and ConfiguredTaskAwaitable in C#

    • Description: Explore using Task.Run with ConfiguredTaskAwaitable to run an asynchronous operation on a different thread.
    • Code:
      // Using Task.Run with ConfiguredTaskAwaitable Task.Run(() => MyAsyncOperation().ConfigureAwait(false)).Wait();

  6. Wait on ConfiguredTaskAwaitable with timeout in C#

    • Description: Learn how to wait for the completion of a ConfiguredTaskAwaitable with a specified timeout.
    • Code:
      // Waiting on ConfiguredTaskAwaitable with timeout bool completed = MyAsyncOperation().ConfigureAwait(false).Wait(TimeSpan.FromSeconds(10));

  7. Wait on ConfiguredTaskAwaitable with CancellationToken in C#

    • Description: Understand how to wait for the completion of a ConfiguredTaskAwaitable with a CancellationToken.
    • Code:
      // Waiting on ConfiguredTaskAwaitable with CancellationToken CancellationTokenSource cancellationTokenSource = new CancellationTokenSource(); CancellationToken cancellationToken = cancellationTokenSource.Token; MyAsyncOperation().ConfigureAwait(false).Wait(cancellationToken);

  8. Task.WhenAll with ConfiguredTaskAwaitable in C#

    • Description: Learn how to use Task.WhenAll with multiple ConfiguredTaskAwaitable instances for parallel waiting.
    • Code:
      // Using Task.WhenAll with ConfiguredTaskAwaitable await Task.WhenAll(MyAsyncOperation().ConfigureAwait(false), AnotherAsyncOperation().ConfigureAwait(false));

  9. Task.WaitAny with ConfiguredTaskAwaitable in C#

    • Description: Understand how to use Task.WaitAny with multiple ConfiguredTaskAwaitable instances for waiting on any completed task.
    • Code:
      // Using Task.WaitAny with ConfiguredTaskAwaitable int completedIndex = Task.WaitAny(MyAsyncOperation().ConfigureAwait(false), AnotherAsyncOperation().ConfigureAwait(false));

  10. BlockingCollection and ConfiguredTaskAwaitable in C#

    • Description: Explore using BlockingCollection with ConfiguredTaskAwaitable for synchronizing asynchronous operations.
    • Code:
      // Using BlockingCollection with ConfiguredTaskAwaitable BlockingCollection<Task> taskCollection = new BlockingCollection<Task>(); taskCollection.Add(MyAsyncOperation().ConfigureAwait(false).AsTask()); taskCollection.Add(AnotherAsyncOperation().ConfigureAwait(false).AsTask()); Task.WaitAll(taskCollection.ToArray());

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