如何设置列表框中选择的多个项目？

Question

I have one ListBox with selection mode of multiple. In code behind, I want to set some values as selected. These values are present in a ListItems[] named 'Names' .

HTML code:

<asp:ListBox ID="lbto" class="chosen" runat="server" Width="450px" 
 Height="20px" SelectionMode="Multiple">
    <asp:ListItem>Mandy</asp:ListItem>
    <asp:ListItem>Amit</asp:ListItem>
    <asp:ListItem>sundar</asp:ListItem>
    <asp:ListItem>ragu</asp:ListItem>
    <asp:ListItem>raju</asp:ListItem>
</asp:ListBox>

ListItem[] Names contains 'ragu' and 'raju' . Now, when the page loads, the ListBox should contain 'ragu' and 'raju' as selected values.

Answer 1

What about setting the Selected -property of the ListItem ?

var names = new List<string>(new string[] { "ragu", "raju" });

foreach (var item in lbto.Items)
{
    if (names.Contains(item.Text))
        item.Selected = true;
}

Answer 2

You can use FindByValue method

foreach (string item in stringList)
    lbxList.Items.FindByValue(item).Selected = true;

Answer 3

int[] IndexList = new int[] { 1, 3, 5, 7, 9 };
for (int i = 0; i < IndexList.Length; i++)
{
    if (listBox1.Items.Count > IndexList[i])
    {
        listBoxFX.SetSelected(IndexList[i], true);
    }
}

Answer 4

Using One line of linq

lbto.Items.Cast<String>().ForEach(i => i.Selected = names.Contains(i.Text));

OR

lbto.Items.OfType<string>().ForEach(i => i.Selected = names.Contains(i.Text));