在C#中快速实现拖放操作
拖放操作是一個我比較喜歡的用戶體驗,但實現(xiàn)起來稍顯麻煩,這里我將它的常用方式簡單的集合了一下,作為擴展方法,以便快速調(diào)用:
static class DrapDropExtend
{
????public static void SimpleDrapDrop<T>(this Control c, string dataformat, Action<T> hanlder) where T : class
????{
????????c.AllowDrop = true;
????????c.DragEnter += (s, e) =>
????????????{
????????????????if (e.Data.GetDataPresent(dataformat))
????????????????????e.Effect = DragDropEffects.Copy;
????????????????else
????????????????????e.Effect = DragDropEffects.None;
????????????};
????????c.DragDrop += (s, e) =>
????????????{
????????????????var data = e.Data.GetData(dataformat) as T;
????????????????hanlder(data);
????????????};
????}
????public static void SimpleDrapDrop(this Control c, Action<DragEventArgs> enterHanlder, Action<DragEventArgs> dropHanlder)
????{
????????c.AllowDrop = true;
????????c.DragEnter += (s, e) => enterHanlder(e);
????????c.DragDrop += (s, e) => enterHanlder(e);
????}
????public static void SimpleDrapDrop(this Control c, DragEventHandler enterHanlder, DragEventHandler dropHanlder)
????{
????????c.AllowDrop = true;
????????c.DragEnter += enterHanlder;
????????c.DragDrop += dropHanlder;
????}
}
該類使得實現(xiàn)拖放更加簡單了,一個簡單的示例如下:
public Form1()
{
????InitializeComponent();
????this.SimpleDrapDrop<string>(DataFormats.Text, x => this.Text = x);
}
這比通過IDE來實現(xiàn)要簡潔得多。
轉(zhuǎn)載于:https://www.cnblogs.com/TianFang/archive/2008/09/20/1294984.html
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