How to Make Non-Blocking Method Calls in C# Using `ThreadPool.QueueUserWorkItem` and `Task.Run`?

Non-blocking method call in C#: Use of ThreadPool.QueueUserWorkItem and Task.Run

In C#, methods can be executed non-blockingly, allowing threads to continue executing without waiting for the method to complete.

The most direct way is to use the ThreadPool.QueueUserWorkItem method. It accepts a WaitCallback delegate as parameter, which specifies the method to be executed asynchronously.

Example:

using System.Threading;

class Foo
{
    static void Main()
    {
        // FireAway将在后台执行
        ThreadPool.QueueUserWorkItem(o => FireAway());

        Console.WriteLine("立即执行");
    }

    static void FireAway()
    {
        Thread.Sleep(5000);
        Console.WriteLine("5秒后执行");
    }
}

In this example, the FireAway method is enqueued into the thread pool and the main thread continues execution immediately after initiating the asynchronous call.

Another method: Task.Run

A more modern and concise way to run tasks asynchronously is to use the Task.Run method, which returns a Task object representing the asynchronous operation.

Example:

using System.Threading.Tasks;

class Foo
{
    static void Main()
    {
        // FireAway将在后台执行
        Task.Run(() => FireAway());

        Console.WriteLine("立即执行");
    }

    static void FireAway()
    {
        Thread.Sleep(5000);
        Console.WriteLine("5秒后执行");
    }
}

ThreadPool.QueueUserWorkItem and Task.Run both provide efficient ways to execute methods non-blockingly in C#. However, when using these technologies in different scenarios, it is important to consider their potential impacts and limitations.

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