How to set multiple items as selected in ListBox?

问题

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.

回答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;
}

回答2:

You can use FindByValue method

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

回答3:

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));

来源：https://stackoverflow.com/questions/15943883/how-to-set-multiple-items-as-selected-in-listbox