CODEWITHSUNDEEP
c#asp.netwebformslistbox
Evan Fosmark
Evan Fosmark

Reputation: 101791

Getting all selected values from an ASP ListBox

I have an ASP ListBox that has the SelectionMode set to "Multiple". Is there any way of retreiving ALL selected elements and not just the last one?

<asp:ListBox ID="lstCart" runat="server" Height="135px" Width="267px" SelectionMode="Multiple"></asp:ListBox>

Using lstCart.SelectedIndex just returns the last element (as expected). Is there something that will give me all selected?

Upvotes: 22

Views: 70235

Answers (3)

oviniciusfeitosa
oviniciusfeitosa

Reputation: 1065

try using this code I created using VB.NET :

Public Shared Function getSelectedValuesFromListBox(ByVal objListBox As ListBox) As String
    Dim listOfIndices As List(Of Integer) = objListBox.GetSelectedIndices().ToList()
    Dim values As String = String.Empty

    For Each indice As Integer In listOfIndices
        values &= "," & objListBox.Items(indice).Value
    Next indice
    If Not String.IsNullOrEmpty(values) Then
        values = values.Substring(1)
    End If
    Return values
End Function

I hope it helps.

Upvotes: 0

Niloofar
Niloofar

Reputation: 751

use GetSelectedIndices method of listbox

  List<int> selecteds = listbox_cities.GetSelectedIndices().ToList();

        for (int i=0;i<selecteds.Count;i++)
        {
            ListItem l = listbox_cities.Items[selecteds[i]];
        }

Upvotes: 2

Ahmad Mageed
Ahmad Mageed

Reputation: 96557

You can use the ListBox.GetSelectedIndices method and loop over the results, then access each one via the items collection. Alternately, you can loop through all the items and check their Selected property.

// GetSelectedIndices
foreach (int i in ListBox1.GetSelectedIndices())
{
    // ListBox1.Items[i] ...
}

// Items collection
foreach (ListItem item in ListBox1.Items)
{
    if (item.Selected)
    {
        // item ...
    }
}

// LINQ over Items collection (must cast Items)
var query = from ListItem item in ListBox1.Items where item.Selected select item;
foreach (ListItem item in query)
{
    // item ...
}

// LINQ lambda syntax
var query = ListBox1.Items.Cast<ListItem>().Where(item => item.Selected);

Upvotes: 63

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