c# – 从特定线程调用方法

发布时间：2020-12-15 08:18:44 所属栏目：百科来源：网络整理

导读：我如何在调用SomeAsyncMethod的同一线程上调用onCompleteCallBack方法？ public void SomeAsycMethod ( Actionobject onCompleteCallBack ){ // get the current thread /* var ThisThread = Thread.CurrentThread. */ Task.Factory.StartNew( () = { Thread

我如何在调用SomeAsyncMethod的同一线程上调用onCompleteCallBack方法？

public void SomeAsycMethod ( Action<object> onCompleteCallBack )
{
    // get the current thread 
    /* var ThisThread = Thread.CurrentThread. */

    Task.Factory.StartNew( () =>
    {
        Thread.Sleep( 1000 );// do some work;

        // lastly call the onCompleteCallBack on 'ThisThread'
        onCompleteCallBack( "some result" );

        // I am looking for something like:
        /* ThisThread.Invoke("some result"); */
    });
}

解决方法

虽然你不能保证你会在同一个线程上调用回调,但你可以保证它将在同一个 Synchronization Context中被调用(假设原始调用中存在一个).

public void SomeAsycMethod ( Action<object> onCompleteCallBack )
{
    // get the current context
    var context = SynchronizationContext.Current;

    Task.Factory.StartNew( () =>
    {
        Thread.Sleep( 1000 );// do some work;

        // lastly call the onCompleteCallBack on 'ThisThread'
        onCompleteCallBack( "some result" );

        // I am looking for something like:
        context.Post(s => onCompleteCallBack ("some result"),null); 
    });
}

例如,在Windows窗体或WPF程序中,上面将确保在GUI线程上调用回调(相应地通过消息循环或调度程序).类似于ASP.NET上下文.

话虽如此,我同意Justin Harvey的回复任务< T>可能会是一个更好的设计.

（编辑：李大同）

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