In .NET 2.0 winforms, is it possible to use the CheckedListBox basically as a radio listbox? I'd like to allow only one selection in the CheckedListBox. In the future there will probably be more but I want to build the current code around a CheckedListBox.
Thanks,
Brett
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Thanks. Here's an off topic question: I have a string that shows in the listbox. But there is a numeric value associated with it, which I don't want displayed. I'm storing both in the listbox and parsing to get the value part. But both are displayed, which I don't want. Is there a better way to do this?
You can utilise the DataSource, ValueMember and DisplayMember properties. Imagine you had a simple Item class with the properties Name and Code (and you only wanted to display the Name but retrieve the Code), the class could be defined as:
public class Item
{
private string name;
private int code;
public Item (string name, int code)
{
this.name = name;
this.code = code;
}
public string Name
{
get { return this.name; }
set { this.name = value; }
}
public int Code
{
get { return this.code; }
set { this.code = value; }
}
}
You can then store objects of type Item into a collection such as an List and have the DataSource property of the ListBox refer to the List object. To do this, declare the List globally in your class:
private List<Item> itemList;
Then in your Form's constructor, initialise the List object and setup the ListBox as follows:
itemList = new List<Item>();
this.listBox1.DisplayMembe
this.listBox1.ValueMember = "Code";
Then you can add items to your ListBox and update the DataSource property so that the ListBox shows whatever Item objects are in your List:
this.itemList.Add(new Item("TV", 12345));
this.listBox1.DataSource = itemList;
After executing the above two statements the ListBox will only show one item with the string "TV". You can use the SelectedValue property to retrieve the value part for the selected item in the ListBox:
int selectedCode = int.Parse(this.listBox1.Se
selectedCode will hold 12345 if the TV item was selected.
Hope this helps!
Unfortunately, I didn't know multi-select wasn't available for checkedListBox: http://msdn.microsoft.com/
drat!
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Answer for Membership
by: Zephyr__Posted on 2007-02-12 at 17:51:24ID: 18520019
Hi, you can accomplish that by handling the ItemCheck event of the CheckedListBox like:
private void checkedListBox1_ItemCheck(
{
if (this.checkedListBox1.Chec
e.NewValue = CheckState.Unchecked;
}
The above code checks if any items are checked, if there is one it doesn't allow a new item to be checked.