c#只有空白窗体没有内容

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace C_yuan
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public System.Drawing.Color Black { get; private set; }

        public MainWindow()
        {
            InitializeComponent();
        }
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            Graphics g = CreateGraphics();
        g.TranslateTransform((float)(100), (float) (100));
            Pen pen = new Pen(Color(100,200,200,200),2);
            g.DrawEllipse(pen, 10, 10, 200, 200); 
        }

        private Brush Color(int v1, int v2, int v3, int v4)
        {
            throw new NotImplementedException();
        }

        private Graphics CreateGraphics()
        {
            throw new NotImplementedException();
        }
    }

    internal class Graphics
    {
        internal void DrawEllipse(Pen pen, int v1, int v2, int v3, int v4)
        {
            throw new NotImplementedException();
        }

        internal void TranslateTransform(float v1, float v2)
        {
            throw new NotImplementedException();
        }
    }
}

程序运行只有空白窗格，是个需要画圆的程序，应该怎么修改呀？