C# listview does not let me to remove an selected

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trying to remove item from a listview of a window form application.
it is so weird that it try to throw an exception each time i do it. And there is the code that i use originally :

exception say: Index was out of range.Must be non-negative and less than the size of the collection. Parameter name:index

C#

private void Remove( )
        {
            
            try
            {
                
                      listView1.Items.RemoveAt(listView1.SelectedItems[0].Index);


            }
            catch (Exception ex) { MessageBox.Show(ex.Message); }
        }

What I have tried:

even though i tried to put in direct index 0 , it still would throw the same exception

C#

ListView.SelectedListViewItemCollection album = this.listView1.SelectedItems;
                if (album.Count > 0)
                    listView1.Items.RemoveAt(0);

Posted 14-Jan-17 23:50pm

Member 12950663

Updated 15-Jan-17 0:40am

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#realJSOP · Answer 1 · 2017-01-15T00:01:00

Solution 1

Did you inspect the SelectedItems collection to make sure it's not empy?

Posted 15-Jan-17 0:01am

#realJSOP

Member 12950663 · Answer 2 · 2017-01-15T00:25:00

Solution 2

yes, i did this , the exception get thrown at **

C#

if (listView1.SelectedItems.Count > 0)
                {
                    listView1.Items.RemoveAt(listView1.SelectedItems[0].Index); **
                    
                    
                }

Posted 15-Jan-17 0:25am

Member 12950663

Comments

Wendelius 15-Jan-17 6:41am

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Wendelius · Answer 3 · 2017-01-15T00:40:00

Taken this is Windows Forms....

In the first example you don't examine if there is a selected index or not so it clearly fails when there is no selection.

If the second example fails with the same exact exception, then perhaps the problem is caused by the location of your code. If you execute the code too early the control may not yet be created. You can investigate the situation from Control.IsHandleCreated Property (System.Windows.Forms)[^]

For example if you call the following code from the form constructor you get the message that the listview isn't created yet. Also if you omit the message and let the code run, you can see that there are three items in the listview so deletion hasn't taken place.

If you call it for example from a button click event, it should work fine

C#

public void RemoveItems(bool omitCheck=false) {

   if (!omitCheck) {
      if (!this.listView1.IsHandleCreated) {
         MessageBox.Show("Listview not fully created yet");
         return;
      }
   }

   this.listView1.MultiSelect = true;

   // Add a few items
   this.listView1.Items.Add("First");
   this.listView1.Items.Add("Second");
   this.listView1.Items.Add("Third");

   // Delete selected items (none)
   foreach (ListViewItem item in this.listView1.SelectedItems) {
      this.listView1.Items.Remove(item);
   }

   // Select two items
   this.listView1.Items[0].Selected = true;
   this.listView1.Items[2].Selected = true;

   // Delete selected items (two)
   foreach (ListViewItem item in this.listView1.SelectedItems) {
      this.listView1.Items.Remove(item);
   }
}