从ItemContainerGenerator.itemChanged事件中查找主机

Question

我正在研究C＃4.0，WPF。我有三个ListView，并且所有三个控件都具有相同的ItemContainerGenerator_ItemsChanged“事件处理程序。所以我的问题是我想从事件处理程序中找到主机ListView。

lst1.ItemContainerGenerator.ItemsChanged += new System.Windows.Controls.Primitives.ItemsChangedEventHandler(ItemContainerGenerator_ItemsChanged);

lst2.ItemContainerGenerator.ItemsChanged += new System.Windows.Controls.Primitives.ItemsChangedEventHandler(ItemContainerGenerator_ItemsChanged);

lst3.ItemContainerGenerator.ItemsChanged += new System.Windows.Controls.Primitives.ItemsChangedEventHandler(ItemContainerGenerator_ItemsChanged);


void ItemContainerGenerator_ItemsChanged(
    object sender,
    System.Windows.Controls.Primitives.ItemsChangedEventArgs e)
    {
        //TODO: Find ListView instance.
        // **REAL Problem**
        // ListViewItem's Visible property has been set based on the deletion
        // button click, so at one place i have to get the count of rows which
        // are visible and proceed with related buttons enable/disable operation.
    }

Answer 1

最简单的解决方案是使用lambdas作为事件处理程序，以便您可以将ListView实例转发到“真正的”处理程序。

lst1.ItemContainerGenerator.ItemsChanged += 
    (o, e) => this.ListViewGeneratorItemsChanged(o, e, lst1);

lst2.ItemContainerGenerator.ItemsChanged += 
    (o, e) => this.ListViewGeneratorItemsChanged(o, e, lst2);

lst3.ItemContainerGenerator.ItemsChanged += 
    (o, e) => this.ListViewGeneratorItemsChanged(o, e, lst3);

void ListViewGeneratorItemsChanged(object sender, ItemsChangedEventArgs e, ListView listView)
{
    // We have the ListView and also the ItemContainerGenerator (in sender)
}