在C#中拖放
本文关键字:拖放 | 更新日期: 2023-09-27 18:20:58
如何在c#中进行"拖动和交换"?我希望我的第一个标签取代第二个,反之亦然。谢谢下面是我的拖放代码——我希望能在dragdrop方法下插入一些东西,但我不知道如何引用数据发布的位置。
private void DragDrop_MouseDown(object sender, MouseEventArgs e)
{
Label myTxt = (Label)sender;
myTxt.DoDragDrop(myTxt.Text, DragDropEffects.Copy);
}
private void DragDrop_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Text))
e.Effect = e.AllowedEffect;
else
e.Effect = DragDropEffects.None;
}
private void DragDrop_DragDrop(object sender, DragEventArgs e)
{
Label myTxt = (Label)sender;
myTxt.Text = e.Data.GetData(DataFormats.Text).ToString();
}
创建一个DataObject
实例,以便传递Label
本身,而不是拖动字符串。您可以指定自己的自定义格式名称,以确保内容符合您的期望。这里有一个快速的例子:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private string DataFormatName = "SomeCustomDataFormatName";
private void DragDrop_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
Label source = (Label)sender;
DataObject data = new DataObject(DataFormatName, source);
source.DoDragDrop(data, DragDropEffects.Copy);
}
}
private void DragDrop_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormatName))
e.Effect = e.AllowedEffect;
else
e.Effect = DragDropEffects.None;
}
private void DragDrop_DragDrop(object sender, DragEventArgs e)
{
Label target = (Label)sender;
Label source = (Label)e.Data.GetData(DataFormatName);
string tmp = target.Text;
target.Text = source.Text;
source.Text = tmp;
}
}