Question

C#中如何进行两个listbox之间的拖动

Answer 1

假设有listBox1, listBox2。
假设从listBox1拖到listBox2：
首先要AllowDrop：listBox2.AllowDrop = true;
然后listBox1响应mousedown事件：
private void listBox1_MouseDown(
object sender, System.Windows.Forms.MouseEventArgs e)
{
if(listBox1.Items.Count==0)
return;

int index = listBox1.IndexFromPoint(e.X,e.Y);
string s = listBox1.Items[index].ToString();
DragDropEffects dde1=DoDragDrop(s,
DragDropEffects.All);

if(dde1 == DragDropEffects.All )
{
listBox1.Items.RemoveAt(listBox1.IndexFromPoint(e.X,e.Y));
}
}

当拖动到listBox2时，响应DragDorp:
private void listBox2_DragOver(
object sender, System.Windows.Forms.DragEventArgs e)
{
e.Effect=DragDropEffects.All;
}

最后drop事件：
private void listBox2_DragDrop(
object sender, System.Windows.Forms.DragEventArgs e)
{
if(e.Data.GetDataPresent(DataFormats.StringFormat))
{
string str= (string)e.Data.GetData(
DataFormats.StringFormat);

listBox2.Items.Add(str);
}
}