从特定线程调用方法

Question

我怎么能onCompleteCallBack在SomeAsyncMethod被调用的同一个线程上调用该方法？

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"); */
    });
}

Answer 1

虽然您不能保证在同一个线程上调用回调,但您可以保证它将在同一个同步上下文中调用(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,我同意贾斯汀哈维的观点,即回归Task<T>意志可能是一个更好的设计.