Question

Using Visual Studio 2008, .Net 3.5

I have a ListView loaded with a bunch of items. I have a right-click popup for removing an item. After removal of an item, I redraw the list view by re-accessing my primary data, and reset the selected item. However, the selected item does not show as selected.

An idea of the code:

public ListView m_lv;  
public MyDataCollection m_Data;  // Has a function to get data based on a tag.  

public void RemoveEventHandler(object sender, EventArgs e)  
{  
  int iSelectedItem= m_lv.FocusedItem.Index;

  int iDataIndexToRemove= m_Data.GetIndexOf(m_lv.FocusedItem.Tag.ToString());  

  m_Data.RemoveAt(iDataIndexToRemove);  // Remove the item.  

  if(0 != m_lv.Items.Count)  
  {  
    if(iSelectedItem == m_Data.Items.Count)  // Removed last.  
      iSelectedItem= m_Data.Items.Count - 1;  
  }

  m_lv.Items.Clear();  // Clear the list view items.  

  // Completely rebuild the list view.  
  foreach(MyData md in m_Data)  
  {  
    ListViewItem lvi= new ListViewItem(md.Column0.ToString());  
    lvi.SubItems.Add(md.Column1.ToString());  
    lvi.SubItems.Add(md.Column3.ToString());  
    lvi.SubItems.Add(md.Column4.ToString());  

    m_lv.Items.Add(lvi);  
  }  

  // Set up tags, column sizes, etc.  

  if(0 != m_lv.Items.Count)  
    m_lv.Items[iSelectedItem].Selected= true;  // Set the selection.      
}  

If I do something like the above, the selected item never shows visually as selected (no background color change) unless I re-size a column or sort. Then it shows as selected. However, if I use the debugger or add a button to use a message box to show me selected items, the item knows it is selected.

I know it is some kind of refresh/drawing problem – any ideas?

Answer 1

It ended up being pretty easy:

// Figure out index of item to remove, iRemoved, do some work....  

m_lv.Items.RemoveAt(iRemoved);  
m_lv.Refresh();

// Figure out what is left so new selection, iNewSelection, can be set....
m_lv.Items[iNewSelection].Selected = true;  

Forgot I had not updated this post!