How Can I Synchronously Invoke an Asynchronous Method in C#?

Synchronously call asynchronous methods

Question:

You have an async method with the following signature:

<code class="language-c#">public async Task<string> GenerateCodeAsync()
{
    string code = await GenerateCodeService.GenerateCodeAsync();
    return code;
}</code>

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:

<code class="language-c#">string code = Task.Run(() => GenerateCodeAsync())
                 .GetAwaiter()
                 .GetResult();</code>

Note:

You need to pay attention to the disadvantages of using .Result directly:

1. 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, using Task.Run to execute an asynchronous method on a thread pool thread eliminates this potential problem.
2. Exception handling: .Result Encapsulate any exceptions thrown in an asynchronous method in AggregateException. To avoid this problem, use .GetAwaiter().GetResult() instead.

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