定義多個Listbox,可以實現相互拖動,如listbox1,listbox2,設置如下allowdrop=true和
this.listBox2.DragDrop += new System.Windows.Forms.DragEventHandler(this.ListBox1_DragDrop);
this.listBox2.MouseDown += new System.Windows.Forms.MouseEventHandler
(this.ListBox1_MouseDown);
this.listBox2.DragOver += new System.Windows.Forms.DragEventHandler
(this.ListBox1_DragOver);
private void moveUpListBox(ListBox ListBox1) //向上移動
{
//by 閆磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.10.11
//若不是第一行則上移
if (ListBox1.SelectedIndex > 0)
{
int index = ListBox1.SelectedIndex;
string temp = ListBox1.Items[index - 1].ToString();
ListBox1.Items[index - 1] = ListBox1.SelectedItem.ToString(); ;
ListBox1.Items[index] = temp;
ListBox1.SelectedIndex = index - 1;
}
}
private void moveDownListBox(ListBox ListBox1) /**/////向下移動
{
//若不是第最后一行則下移
if (ListBox1.SelectedIndex < ListBox1.Items.Count - 1)
{
int index = ListBox1.SelectedIndex;
string temp = ListBox1.Items[index + 1].ToString();
ListBox1.Items[index + 1] = ListBox1.SelectedItem.ToString(); ;
ListBox1.Items[index] = temp;
ListBox1.SelectedIndex = index + 1;
//ListBox1.val
}
}
private void button1_Click(object sender, EventArgs e) //調用向上移動
{
moveUpListBox(ListBox1);
}
private void button2_Click(object sender, EventArgs e) //調用向下移動
{
moveUpListBox(ListBox1);
}
//下面是拖動
//by 閆磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.10.11
private ListBox sourcelbl;//拖動源
private void ListBox1_DragOver(object sender, DragEventArgs e)
{
//拖動源和放置的目的地一定是一個ListBox
if (e.Data.GetDataPresent(typeof(System.String)))
{
e.Effect = DragDropEffects.Move;
}
else
e.Effect = DragDropEffects.None;
}
private void ListBox1_DragDrop(object sender, DragEventArgs e)
{
ListBox listbox = (ListBox)sender;
int indexoftarget = listbox.IndexFromPoint(listbox.PointToClient(new Point(e.X, e.Y)));
//拖動源和放置的目的地可能不一樣
int idx = -1;
for (int i = sourcelbl.SelectedItems.Count - 1; i == 0; i--)
{
if (!listbox.Equals(sourcelbl) && indexoftarget == -1)
{
idx = listbox.Items.Add(sourcelbl.SelectedItems[i].ToString());
}
else
{
listbox.Items.Insert(indexoftarget, sourcelbl.SelectedItems[i].ToString());
}
}
sourcelbl.Items.RemoveAt(sourcelbl.SelectedIndex);
if (idx > -1)
{
listbox.SelectedIndex = idx;
}
else
listbox.SelectedIndex = indexoftarget;
}
private void ListBox1_MouseDown(object sender, MouseEventArgs e)
{
sourcelbl = (ListBox)sender;
int indexofsource = sourcelbl.SelectedIndex;
if (indexofsource > -1)
{
sourcelbl.DoDragDrop(sourcelbl.Items[indexofsource].ToString(), DragDropEffects.All);
}
}
//本文參考:http://blog.csdn.net/J_S_S/archive/2007/06/02/1635012.aspx,對本文的作者表示由衷感謝
//////////////////////////////////////////
實現listbox 之間的自由拖拽源代碼
public static int n;
private void listBox1_MouseDown(object sender, MouseEventArgs e)
{
int i = 0;
for (i = 0; i <= listBox1.Items.Count - 1; i++)
{
if (listBox1.GetSelected(i))
{
n = i;
break;
}
}
}
private void listBox2_MouseHover(object sender, EventArgs e)
{
bool flag = false;
for (int i = 0; i <= listBox2.Items.Count - 1; i++)
{
if (listBox1.Items[n].ToString() == listBox2.Items[i].ToString())
{
flag = true;
break;
}
}
if (flag)
{
MessageBox.Show("對不起，移動錯誤!");
}
else
{
listBox2.Items.Add(listBox1.Items[n].ToString());
}
}
private void Form1_Load(object sender, EventArgs e)
{
}