从ItemContaineregener.Itemchanged活动中查找主机

Question

我正在处理C＃4.0，WPF。我有三个listView，所有三个控件都具有相同的ItemContainererator_Itemschanged“事件处理程序。所以我的问题是我想找到主机 ListView 从活动处理程序中。

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将Lambdas用作事件处理程序，以便您可以转发 ListView 实例与您的“真实”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)
}