学步园

话说WPF的Dispatcher类是这样的方法：

 

public DispatcherOperation BeginInvoke(Delegate method, params object[] args);

我们使用的时候不得不这样些：

 

Dispatcher.BeginInvoke((Action)delegate() 
            {
                //Do something...
            });

不觉得丑么？还要强制转换成Action。

可你说，它参数是Delegate，我杂办啊？

呵呵，你忘了扩展方法了？

如果我们能变成：

 

Dispatcher.BeginInvoke(()=>
            {
                //Do something...
            });

这样，该多方便啊，一个Lambda就搞定了。

于是我们自己写个Dispatcher的扩展方法：

 

public static class DispatcherExtensions
    {
        public static DispatcherOperation BeginInvoke(this Dispatcher dispatcher, Action action)
        {
            return dispatcher.BeginInvoke(action, new object[0]);
        }

        public static DispatcherOperation BeginInvoke(this Dispatcher dispatcher, Action action, DispatcherPriority priority)
        {
            return dispatcher.BeginInvoke(action, priority, new object[0]);
        }

        public static void Invoke(this Dispatcher dispatcher, Action action)
        {
            dispatcher.Invoke(action, new object[0]);
        }

        public static void Invoke(this Dispatcher dispatcher, Action action, TimeSpan timeout)
        {
            dispatcher.Invoke(action, timeout, new object[0]);
        }

        public static void Invoke(this Dispatcher dispatcher, Action action, DispatcherPriority priority)
        {
            dispatcher.Invoke(action, priority, new object[0]);
        }

        public static void Invoke(this Dispatcher dispatcher, Action action, TimeSpan timeout, DispatcherPriority priority)
        {
            dispatcher.Invoke(action, timeout, priority, new object[0]);
        }
    }