怎样将一个listbox的item，转到另一个listbox

Question

if (listbox1.selectindex!=-1)
{
listbox2.items.add(listbox1.selectitem.text);
}

Answer 1

先listbox2.items.add(listbox1.selectitem.text);可能要做个循环，然后你应该把ListBox1的那个Item删除。

Answer 2

private void btnAdd_Click(object sender, System.EventArgs e)
{
if(this.listSource.Items.Count>0)
{
this.listSource.Items[0].Selected=true;
ListItem item = this.listSource.SelectedItem;


if(item != null)
{
this.listSource.Items.Remove(item);
this.AddOneToList(item,this.listTarget);
     }
}
          this.listTarget.SelectedIndex=-1;
           
} private void AddOneToList(ListItem item,ListBox box)
{
bool isAdd=true;
foreach(ListItem listItem in box.Items)
{
if(item.Value == listItem.Value)
{
isAdd = false;
break;
}
}
if(isAdd)
{
box.Items.Add(item);
}
} private void btnDel_Click(object sender, System.EventArgs e)
{
if(this.listTarget.Items.Count>0)
{
this.listTarget.Items[0].Selected=true;
        ListItem item = this.listTarget.SelectedItem;
if(item != null)
{
this.listTarget.Items.Remove(item);
this.AddOneToList(item,this.listSource);
}
   }
this.listSource.SelectedIndex=-1; } private void btnAddAll_Click(object sender, System.EventArgs e)
{
this.listSource.SelectedIndex = -1;
for(int i=0;i<this.listSource.Items.Count;i++)
{
this.AddOneToList(this.listSource.Items[i],this.listTarget);
}
this.listSource.Items.Clear();
} private void btnDelAll_Click(object sender, System.EventArgs e)
{
this.listTarget.SelectedIndex = -1;
for(int i=0;i<this.listTarget.Items.Count;i++)
{
this.AddOneToList(this.listTarget.Items[i],this.listSource);
}
this.listTarget.Items.Clear(); }