How Can I Synchronously Call an Asynchronous Method Using Task.Run?

Use Task.Run to call asynchronous methods synchronously

Asynchronous programming allows us to perform long-running operations without blocking the main thread. However, in some cases we may need to call asynchronous methods synchronously. Here's how to achieve this using Task.Run:

Scene:

Consider the following asynchronous method:

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

Suppose we need to call this method synchronously from another synchronous method.

Solution:

To run an asynchronous method synchronously, we can use the Task.Run method to execute it in a thread pool thread:

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

This code uses the following steps:

1. Task.Run: It creates a background thread pool task and executes the GenerateCodeAsync method.
2. GetAwaiter(): It retrieves an awaiter for the task, representing the result of the asynchronous operation.
3. GetResult(): It blocks the calling thread until the asynchronous operation is completed and returns the result of the method.

Disadvantages of using .Result directly:

The simple method of directly accessing the task's Result property (i.e. string code = GenerateCodeAsync().Result;) should be avoided as it has the following disadvantages:

• Deadlock: This method can cause a deadlock if the async method attempts to access the UI thread while blocking. Task.Run executes the method in a separate thread, thus preventing this problem.
• Exception handling: .Result Wrap any exception thrown in an asynchronous method in an AggregateException. By using .GetAwaiter().GetResult() we avoid this problem and receive the exception directly.

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