如何在WPF中使用GDI +绘图？

using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Media.Imaging;

Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
Graphics graphics = Graphics.FromImage(bitmap);

graphics.Clear(Color.White);
graphics.DrawString("Hello, GDI+ in WPF!", new Font("Arial", 20), new SolidBrush(Color.Black), new PointF(50, 50));

MemoryStream memoryStream = new MemoryStream();
bitmap.Save(memoryStream, ImageFormat.Png);
memoryStream.Position = 0;
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.StreamSource = memoryStream;
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.EndInit();
bitmapImage.Freeze();

image.Source = bitmapImage;

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows;
using System.Windows.Media.Imaging;

namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            int width = 800;
            int height = 600;

            Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
            Graphics graphics = Graphics.FromImage(bitmap);

            graphics.Clear(Color.White);
            graphics.DrawString("Hello, GDI+ in WPF!", new Font("Arial", 20), new SolidBrush(Color.Black), new PointF(50, 50));

            MemoryStream memoryStream = new MemoryStream();
            bitmap.Save(memoryStream, ImageFormat.Png);
            memoryStream.Position = 0;

            BitmapImage bitmapImage = new BitmapImage();
            bitmapImage.BeginInit();
            bitmapImage.StreamSource = memoryStream;
            bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
            bitmapImage.EndInit();
            bitmapImage.Freeze();

            image.Source = bitmapImage;
        }
    }
}