Programmatically select a Listview item

I can't programmatically select an item on a listview in c# 2005 beta2. Basically, I:

1. Create a Listview called Listview1
2. Populate Listview1 with some preset items during startup of form
3. Select first item by:
Listview1.Items[0].Selected = true;
4. Problem is that I get zero when I execute:
Listview1.SelectedItems.Count

I have tried setting focus to Listview1 but I still set zero returned. Is this a bug - or am I doing something wrong

Thanks

Answer this question

Programmatically select a Listview item

catlion

This is just a wild guess, but do you run multiple threads in this program If you do, have you made sure all the UI related calls happen on the UI thread

It isn't a terribly good guess, I'd expect you have problems in VB.NET as well as C# if it was something like this.

The following simple test case seems to do what one would expect so there must be some wrinkle in your program we aren't seeing

Create a simple form program and drop a a ListView and two Buttons on the form. Use the designer to add one column to the ListView.

The first button's click handler fills the list view

private void button1_Click(object sender, System.EventArgs e)
{
ListViewItem item1 = new ListViewItem("item1");
listView1.Items.Add (item1);

ListViewItem item2 = new ListViewItem("item2");
listView1.Items.Add (item2);

ListViewItem item3 = new ListViewItem("item3");
listView1.Items.Add (item3);
}

The second button programmatically selects the first item in the list

private void button2_Click(object sender, System.EventArgs e)
{
   listView1.Items[0].Selected = true;

   int i = GetSelectedIndex (listView1);

   Console.WriteLine ("Select: i={0}", i);
}

public static int GetSelectedIndex(ListView InListView)
{
   if (InListView.SelectedItems.Count == 0)
   {
      return 0;
   }

   // Too lazy to dial out the index
   return InListView.SelectedItems.Count;
}

rainboy
Thanks for the suggestions. The procedure is called during form startup and that seems to be the problem. Using debug, I can see that the item's selected value is correctly set to true but the selected.count is zero. Once the form is up and running, the procedure works perfectly. I presume this is a bug in beta2.

I have got round the problem by looping through each item on the listview and check if its selected value is true.
adeel alvi
Post the code to reproduce this.
Allan Mitchell
Not sure if posting all the code will help because it is very long ... below are parts of it. Program is a free song projection software which I have written in VB.NET. I am in the process of porting it to c#:

//Calling Procedure
//WorshipList is the ListView which has just been populated with data from a text file

if (WorshipList.Items.Count > 0)
{
WorshipList.Items[0].Selected = true;
WorshipListIndexChanged(1);
}

private void WorshipListIndexChanged(int StartingSlide)
{
int Selecteditem;
gf.PreviewItem.Source = gf.ItemSource.WorshipList;
gf.TotalWorshipListItems = WorshipList.Items.Count;
Selecteditem = gf.GetSelectedIndex(WorshipList);
if (Selecteditem >= 0)
{
...
}

public static int GetSelectedIndex(ListView InListView)
{
if (InListView.SelectedItems.Count == 0)
{
...
}
}

//The above: InListView.SelectedItems.Count returns 0
anibaki
Hello,

Try this...

lvTheList.SelectedIndex = iIndexToSelect; //e.g 0 for the first item etc

Hope this helps,
Gary
Programmatically select a Listview item

Answer this question