How Can I Synchronously Execute an Async Task Method?

How to Synchronously Run an Async Task Method

Async programming offers a convenient way to handle asynchronous operations, but there may be scenarios where you need to execute an async method synchronously. One common misconception is attempting to use Task.RunSynchronously(), which can result in an InvalidOperationException.

To avoid this issue, consider using the following methods from the AsyncHelpers class:

public static void RunSync(Func<Task> task);
public static T RunSync<T>(Func<Task<T>> task);

Usage:

var customerList = AsyncHelpers.RunSync(() => GetCustomers());

Implementation:

The RunSync method creates an ExclusiveSynchronizationContext instance and sets it as the current SynchronizationContext. It posts a delegate to execute the async task and waits for its completion. If an exception occurs during execution, it is rethrown as an AggregateException within the Run method.

Advantages:

• Works even if the dispatcher is in a suspended state.
• Eliminates the need for error handling with try-catch or await blocks.
• Provides synchronous execution semantics for async methods.

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