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Await vs. Result in .NET Asynchronous Programming: Why Does Using 'Result' Lead to Deadlocks?

Mary-Kate Olsen
Mary-Kate OlsenOriginal
2025-01-31 13:36:11499browse

Await vs. Result in .NET Asynchronous Programming: Why Does Using 'Result' Lead to Deadlocks?

.NET asynchronous programming

The difference between and await: Why use Result to cause dead locks? Result In the .NET asynchronous programming, understanding the difference between

and

is very important. await Allow collaborative multi -task processing, and Result may cause dead locks. await Result

The working principle and the cause of the

obstruction await Result The test program is hung in the example because it tries to use

to obtain the

result twice simultaneously. This can cause dead locks because the underlying HTTP request is blocked when waiting for response. CheckStatusTwiceResultTest Result CheckStatus() The advantages of

The keyword allows the execution of the pause method, and the execution is resumed after the asynchronous operation is completed. In this example, will not hang when runtime, because await Keywords will be controlled to other tasks when waiting for HTTP response.

Synchronous and asynchronous programming

await CheckStatusAwaitTest Extension method Create a await, and use the asynchronous commission to set its results. However, calling

in the return task is actually performing asynchronous operations in synchronization. This is why

hanging. Avoid dead locks

ExecuteTaskAsync To avoid dead locks, the results of TaskCompletionSource obtaining asynchronous operations are always used. The best practice is to avoid calling Result on the task, especially when performing in UI threads or other sensitive environments. CheckStatusTwiceResultTest

Use the execution

method in the code. For asynchronous methods, this is not recommended, because await will allocate a new thread. Instead, the inherent asynchronousness provided by the .NET framework should be used, and the method should be set to asynchronous methods. Result

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