How Can I Call Asynchronous Methods from Synchronous Methods in C#?

Call asynchronous method in the synchronization method in C#

Calling asynchronous methods in synchronous code (usually async modification symbol logo) is a common development problem. Asynchronous programming can perform the operation of the CEO for a long time while maintaining the UI response, but this usually needs to adjust the code structure, which may not match the existing synchronization method.

Plan 1: task.waitandunwrapexception

If the asynchronous method (MyasyncmedHod) can run independently, without the need to synchronize the context, you can use task.waitandunwrapexception to provide a simple solution:

However, you need to pay attention when using task.wait or task.Result, they will pack abnormal packaging in AggregateException.

<code class="language-csharp">var task = MyAsyncMethod();
var result = task.WaitAndUnwrapException();</code>

Plan 2: AsyncContext.runtask

or, if myAsyncmedhod needs to be synchronized with context, asynccontext.runtask provides a method of nested context:

Plan 3: task.run

<code class="language-csharp">var result = AsyncContext.RunTask(MyAsyncMethod).Result;</code>

In some cases, asyncContext.runtask may be limited, such as asynchronous methods that depend on UI events. In this case, the asynchronous method can be performed on the thread pool:

Please note that this method requires that MyasyncmetHod can be compatible with the context of the thread pool, including the restrictions on UI element updates and ASP.NET request context access.

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