How Can I Synchronously Invoke an Asynchronous Method in C#?
Jan 19, 2025 pm 01:43 PMSynchronously call asynchronous methods
Question:
You have an async method with the following signature:
1 2 3 4 5 |
|
However, you need to call this method synchronously in a synchronization context. How to achieve it?
Solution:
In order to call an asynchronous method synchronously, you can use a thread pool thread to execute the method. By using the task's awaiter, you can block the calling thread until the asynchronous operation completes:
1 2 3 |
|
Note:
You need to pay attention to the disadvantages of using .Result
directly:
-
Deadlock: Using
.Result
may cause a deadlock because the main thread is blocked, preventing the asynchronous method from completing. To prevent this, use.ConfigureAwait(false)
with caution. This approach is not without its complications. However, usingTask.Run
to execute an asynchronous method on a thread pool thread eliminates this potential problem. -
Exception handling:
.Result
Encapsulate any exceptions thrown in an asynchronous method inAggregateException
. To avoid this problem, use.GetAwaiter().GetResult()
instead.
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