How to set multiple selections in ASP.NET ListBox?

问题:

I can't find a way to select multiple items in an ASP.NET ListBox in the code behind? Is this something needs to be done in Javascript?

回答1:

this is the VB code to do so...

myListBox.SelectionMode = Multiple
For each i as listBoxItem in myListBox.Items
  if i.Value = WantedValue Then
      i.Selected = true
  end if 
Next

回答2:

Here's a C# sample

---

(aspx)

<form id="form1" runat="server">
        <asp:ListBox ID="ListBox1" runat="server" >
            <asp:ListItem Value="Red" />
            <asp:ListItem Value="Blue" />
            <asp:ListItem Value="Green" />
        </asp:ListBox>
        <asp:Button ID="Button1" 
                    runat="server" 
                    onclick="Button1_Click" 
                    Text="Select Blue and Green" />
</form>

(Code Behind)

protected void Button1_Click(object sender, EventArgs e)
{
     ListBox1.SelectionMode = ListSelectionMode.Multiple;            
     foreach (ListItem item in ListBox1.Items)
     {
          if (item.Value == "Blue" || item.Value == "Green")
          {
               item.Selected = true;
          }
     }
}

回答3:

You will have to use FindByValue method of the ListBox

foreach (string selectedValue in SelectedValuesArray)
                    {
                        lstBranch.Items.FindByValue(selectedValue).Selected = true;
                    }

回答4:

In C#:

foreach (ListItem item in ListBox1.Items)
{
    item.Attributes.Add("selected", "selected");
}

回答5:

I like where bill berlington is going with his solution. I don't want to iterate through the ListBox.Items for each item in my array. Here is my solution:

foreach (int index in indicesIntArray)
{
    applicationListBox.Items[index].Selected = true;
}