Add event handler for ListView Items_added

In C# Windows Form Application; Is there an event handler for the ListView control that is fired when items are added to the listview it开发者_运维知识库ems ?

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You dont need to edit other source!

Ok: change from ListView to myListView

Long time ago - but i search for an solution without implements with own ItemAdd-Function! The best way to do it... use the WndProc-Function.

Message: LVM_INSERTITEM

http://msdn.microsoft.com/en-us/library/windows/desktop/bb761107%28v=vs.85%29.aspx

//COMMCTRL.H
#define LVM_FIRST               0x1000           // ListView messages
#define LVM_INSERTITEMA         (LVM_FIRST + 7)  
#define LVM_INSERTITEMW         (LVM_FIRST + 77) 
//edit itemremove (LVM_DELETEITEM)
#define LVM_DELETEITEM          (LVM_FIRST + 8)

C#-implementation

class myListView : ListView {

    protected override void WndProc(ref Message m){
        base.WndProc(ref m);

        switch (m.Msg){
            case 0x1007:    //ListViewItemAdd-A
                System.Diagnostics.Debug.WriteLine("Item added (A)");
                break;
            case 0x104D:    //ListViewItemAdd-W
                System.Diagnostics.Debug.WriteLine("Item added (W)");
                break;
            //edit for itemremove
            case 0x1008:
                System.Diagnostics.Debug.WriteLine("Item removed");
                break;
            case 0x1009:
                System.Diagnostics.Debug.WriteLine("Item removed (All)");
                break;
            default:
                break;
        }
    }
}

Now you can fire your own ItemAddedEvent. I hope that helps other people, who have the same issue.

gegards raiserle

(edit: please vote ;) )

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I would see here or here. They are more or less the same answer, just written in very different styles. Short version, add ItemAdded event to ListViewItemCollection.

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There is no event that do that. But you can always create your own list box:

public class MyListView : ListView
{
    public void AddItem(ListViewItem item)
    {
        Items.Add(item);
        if (ItemAdded != null)
            ItemAdded.Invoke(this, new ItemsAddedArgs(item));
    }

    public EventHandler<ItemsAddedArgs> ItemAdded;
}

public class ItemsAddedArgs : EventArgs
{
    public ItemsAddedArgs(ListViewItem item)
    {
        Item = item;
    }

    public object Item { get; set; }
}

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Another alternative is to hold the items in an instance of the ObservableCollection class, set ListView.ItemsSource to that collection and subscribe to the ObservableCollection.CollectionChanged event.

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The framework does not define an event such as ItemAdded. However, make sure to visit this workaround: An Observer Pattern and an Extended ListView Event Model. For example, the following events are defined there:

public event ListViewItemDelegate ItemAdded; 
public event ListViewItemRangeDelegate ItemRangeAdded; 
public event ListViewRemoveDelegate ItemRemoved; 
public event ListViewRemoveAtDelegate ItemRemovedAt;