为WPF的Shape添加Children

public class VisualPanel : FrameworkElement

  {      

 protected VisualCollection Children { get; set; }

       public VisualPanel()

       {

          Children = new VisualCollection(this);

       }

        protected override int VisualChildrenCount

       {

          get

          {

              return Children.Count;

          }

       }

        protected override Visual GetVisualChild(int index)

       {

          return Children[index];

       }

        protected override Size ArrangeOverride(Size finalSize)

       {

          if (VisualChildrenCount>0)

          {

              (Children[0] as FrameworkElement).Arrange(new Rect(0, 0, 100, 25));

          }

          return base.ArrangeOverride(finalSize);

       }  }

添加元素,并将加入到Window窗体中

public class  VisualTest  : VisualPanel

  {

      public  TextBlock  textblock;

        private void  TestVisual()

      {

          textblock = new  TextBlock() { Text = "Hello", Background = Brushes.Red };              this.Children.Add(textblock);

      }

        public  VisualTest()

      { 

         TestVisual();

      } 

 }