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;
 } 
}