将多个选定项从ListBox传输到另一个ListBox

Question

I would like to know how to move the items I have selected from left ListBox to the right ListBox ? I tried to search but I've only seen moving the single item or all items from one ListBox to another.

Answer 1

You can iterate over all items of the listbox, check each item if it is selected and transfer that item to the other listbox

foreach (ListItem item in ListBox1.Items.Where(li=>li.Selected))
{
  // Move item to the other Listbox (You already have the code for this as you mentioned)
}

Answer 2

Firstly set the Listbox 's SelectionMode property to Multiple :

<asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
<asp:ListBox ID="ListBox2" runat="server" SelectionMode="Multiple">

Then:

foreach (ListItem item in ListBox1.Items.Cast<ListItem>().Where(item => item.Selected))
{
    ListBox2.Items.Add(item);
}

In ListBox1 select multiple items by holding Ctrl key then by clicking the button it should transfer multi selected items to ListBox2 .

Answer 3

I already have solution on my problem:

foreach (ListItem item in listbox1.Items)
{
  if (item.Selected == true)
  {
    listbox2.Items.Add(item);
  }
}