ItemsControl.GetContainerForItemOverride 方法

public class CustomTabControl : TabControl
{
public CustomTabControl()
{
}
public Type AutoGenerateItemType
{
get { return (Type)GetValue(AutoGenerateItemTypeProperty); }
set { SetValue(AutoGenerateItemTypeProperty, value); }
}
public static readonly DependencyProperty AutoGenerateItemTypeProperty =
DependencyProperty.Register("AutoGenerateItemType", typeof(Type), typeof(CustomTabControl),
new FrameworkPropertyMetadata(typeof(TabItem), FrameworkPropertyMetadataOptions.AffectsMeasure,
OnAutoGenerateItemTypeChanged, new CoerceValueCallback(CoerceAutoGenerateItemTypeValue)));

public static void OnAutoGenerateItemTypeChanged(DependencyObject sender,DependencyPropertyChangedEventArgs e)
{
}

public static object CoerceAutoGenerateItemTypeValue(DependencyObject sender, object value)
{
Type type = value as Type;
// 应保证提供的类型为HeaderedContentControl。
if(type.IsSubclassOf(typeof(HeaderedContentControl)))
return value;
else
return sender.GetValue(AutoGenerateItemTypeProperty);;
}
///
/// 生成自定义的TabItem控件。
///
protected override DependencyObject GetContainerForItemOverride()
{
System.Reflection.ConstructorInfo info = this.AutoGenerateItemType.GetConstructor(Type.EmptyTypes);
if (info == null) throw new InvalidProgramException(AutoGenerateItemType.FullName + "不存在无参构造函数。");
return info.Invoke(null) as DependencyObject;
}
}