sliverlight本身沒有提供DoubleClick，如果實現可以在網上找到很多實現發方法，

我試了幾個，這邊這個算是最簡單的，不過對於button這種已經繫結了click觸發器總是有問題，

對於其他所有控制元件都可以正常使用，只要繫結了MouseLeftButtonDown和MouseLeftButtonUp這兩個觸發器就OK了

實現原理很簡單，記錄MouseLeftButtonUp和MouseLeftButtonDown的時間戳，計算時間差，只要小於1/10秒就可以，大於0就算雙擊，就是雙擊中第一次點選和第二次點選時間差小於1/10秒。

實現程式碼：

    public class GraphicsUtils
    {
        #region Double click

///

/// Holds the millis for the first click.
///

private long lastClickedTime = 0;

///

/// Delegate definition for the call back function.
///

        ///
        ///
        public delegate void DoubleClickHandler(object sender, MouseButtonEventArgs e);

///

/// Holder for the call back function.
///

private DoubleClickHandler doubleClickCallBackFunction;
///

/// This will attach a double click to an object.
///

        ///
        /// Due to Silverlight lack of double click event a custom implementation is needed.
        /// this function and its adjacent handlers will attach a double click event to any object
        /// deriving from UIElement.
        ///
        /// the UIElement to attach the event to.
        /// the function to call upon the double click event.
        public void AttachDoubleClick(object doubleClickTarget, DoubleClickHandler function)
        {
            UIElement target = (UIElement)doubleClickTarget;
            target.MouseLeftButtonUp += new MouseButtonEventHandler(target_MouseLeftButtonUp);
            target.MouseLeftButtonDown += new MouseButtonEventHandler(target_MouseLeftButtonDown);
            doubleClickCallBackFunction = function;
        }

        private void target_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            lastClickedTime = DateTime.Now.Ticks / 10000;
        }

        private void target_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            long currentMillis = DateTime.Now.Ticks / 10000;

            if (currentMillis - lastClickedTime < 100 && currentMillis - lastClickedTime > 0)
            {
                //HERE IS DOUBLE CLICK
                doubleClickCallBackFunction(sender, e);
            }

}

#endregion
}

使用方法，比如裡面有個橢圓，名稱是doubleclick，那麼繫結方法如下：

    GraphicsUtils.DoubleClickHandler dblClickHandler = new GraphicsUtils.DoubleClickHandler(MyMethodToHandleDoubleClick);
            GraphicsUtils gu = new GraphicsUtils();
            gu.AttachDoubleClick(this.doubleclick, dblClickHandler);

MyMethodToHandleDoubleClick是雙擊觸發的事件，很簡單，就和click事件一樣寫、

這個可以放在頁面初始化時候進行繫結，是一個比較方便簡單的方法，

原載與

sliverlight簡單方法實現雙擊觸發

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