以下代码演示如下：

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        Pen pen = new Pen();

        public Window1()
        {
            InitializeComponent();
            pen.Brush = Brushes.Black;
        }

        protected override void OnRender(DrawingContext dc)
        {
            base.OnRender(dc);
            dc.DrawRectangle(Brushes.Black,pen,new Rect(0,600,400));
            dc.DrawEllipse(Brushes.Green,new Point(300,300),50,50);
        }
    }
}

在FrameworkElement中替换绘图逻辑(然后将元素设置为窗口的内容)工作正常.

谢谢,

丹尼