Action T同步和异步

Question

我有一个ContextMenuStrip控件,允许你执行一个动作是两种不同的风格:Sync和Async.

我试图用泛型覆盖所有内容所以我这样做:

public class BaseContextMenu<T> : IContextMenu
{
   private T executor;

   public void Exec(Action<T> action)
   {
      action.Invoke(this.executor);
   }

   public void ExecAsync(Action<T> asyncAction)
   {
       // ...
   }

我如何编写异步方法以执行通用操作并同时使用菜单"执行某些操作"？我看到签名BeginInvoke是这样的:

asyncAction.BeginInvoke(this.executor, IAsyncCallback, object);

Answer 1

这是Jeffrey Richter关于.NET异步编程模型的文章.http://msdn.microsoft.com/en-us/magazine/cc163467.aspx

以下是如何使用BeginInvoke的示例:

public class BaseContextMenu<T> : IContextMenu
{
    private T executor;

    public void Exec(Action<T> action)
    {
        action.Invoke(this.executor);
    }

    public void ExecAsync(Action<T> asyncAction, AsyncCallback callback)
    {
        asyncAction.BeginInvoke(this.executor, callback, asyncAction);
    }
}

这是一个可以传递给ExecAsync的回调方法:

private void Callback(IAsyncResult asyncResult)
{
    Action<T> asyncAction = (Action<T>) asyncResult.AsyncState;
    asyncAction.EndInvoke(asyncResult);
}