CODEWITHSUNDEEP
c#.netwinformscomboboxlistbox
tzam
tzam

Reputation: 1962

Get the value for a listbox item by index

This must be very easy but I am stuck. I have a listBox with X Items. Each Item has a text description (Which appears in the listBox) and its value(numerical). I want to be able to get the value property of an item, using the index number of the item.

Upvotes: 15

Views: 173692

Answers (7)

Reza Aghaei
Reza Aghaei

Reputation: 125197

Here I can't see even a single correct answer for this question (in WinForms tag) and it's strange for such frequent question.

Items of a ListBox control may be DataRowView, Complex Objects, Anonymous types, primary types and other types. Underlying value of an item should be calculated base on ValueMember.

ListBox control has a GetItemText which helps you to get the item text regardless of the type of object you added as item. It really needs such GetItemValue method.

GetItemValue Extension Method

We can create GetItemValue Extension Method to get item value which works like GetItemText:

using System;
using System.Windows.Forms;
using System.ComponentModel;
public static class ListControlExtensions
{
    public static object GetItemValue(this ListControl list, object item)
    {
        if (item == null)
            throw new ArgumentNullException("item");

        if (string.IsNullOrEmpty(list.ValueMember))
            return item;

        var property = TypeDescriptor.GetProperties(item)[list.ValueMember];
        if (property == null)
            throw new ArgumentException(
                string.Format("item doesn't contain '{0}' property or column.",
                list.ValueMember));
        return property.GetValue(item);
    }
}

Using above method you don't need to worry about settings of ListBox and it will return expected Value for an item. It works with List<T>, Array, ArrayList, DataTable, List of Anonymous Types, list of primary types and all other lists which you can use as data source. Here is an example of usage:

//Gets underlying value at index 2 based on settings
this.listBox1.GetItemValue(this.listBox1.Items[2]);

Since we created the GetItemValue method as an extension method, when you want to use the method, don't forget to include the namespace which you put the class in.

This method is applicable on ComboBox and CheckedListBox too.

Upvotes: 13

Jair Martinez
Jair Martinez

Reputation: 9

simply try this 'listBox' is your list and 'yu' is a veriable to which the value on index 0 will be assigned

string yu = listBox1.Items[0].ToString();
MessageBox.Show(yu);

Upvotes: 1

user3666179
user3666179

Reputation: 171

It would be

String MyStr = ListBox.items[5].ToString();

Upvotes: 17

Mike K
Mike K

Reputation: 1313

I'm using a BindingSource with a SqlDataReader behind it and none of the above works for me.

Question for Microsoft: Why does this work:

  ? lst.SelectedValue

But this doesn't?

   ? lst.Items[80].Value

I find I have to go back to to the BindingSource object, cast it as a System.Data.Common.DbDataRecord, and then refer to its column name:

   ? ((System.Data.Common.DbDataRecord)_bsBlocks[80])["BlockKey"]

Now that's just ridiculous.

Upvotes: 4

Akram Shahda
Akram Shahda

Reputation: 14771

If you are working on a windows forms project you can try the following:

Add items to the ListBox as KeyValuePair objects:

listBox.Items.Add(new KeyValuePair(key, value);

Then you will be able to retrieve them the following way:

KeyValuePair keyValuePair = listBox.Items[index];
var value = keyValuePair.Value;

Upvotes: 5

Bibhu
Bibhu

Reputation: 4081

Suppose you want the value of the first item.

ListBox list = new ListBox();
Console.Write(list.Items[0].Value);

Upvotes: 2

DaveShaw
DaveShaw

Reputation: 52788

This works for me:

ListBox x = new ListBox();
x.Items.Add(new ListItem("Hello", "1"));
x.Items.Add(new ListItem("Bye", "2"));

Console.Write(x.Items[0].Value);

Upvotes: 2

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