WPF将图像作为内容添加到按钮不工作

我正在尝试创建图像15拼图游戏，你必须通过滑动方块来组合图像。几乎所有的工作都是正确的，除了在按钮中显示图像，它显示为一个文本"System.Drawing.Image"。

下面是我的MainWindow.xaml.cs代码:

using System;
using System.Windows;
using System.Windows.Controls;
using System.Collections;
using static System.Math;
using System.Collections.Generic;
using System.Drawing;
using Image = System.Drawing.Image;
using Brushes = System.Windows.Media.Brushes;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace Quizz
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    //Array of buttons
    private static readonly List<Button> Buttons = new List<Button>(15);
    // Position of an empty space
    private static int _xPos;
    private static int _yPos;
    public MainWindow()
    {
        InitializeComponent();
    }
    private void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        for (var i = 0; i < 15; i++)
        {
            Buttons.Add(new Button() { Background = Brushes.AliceBlue });
        }
        _xPos = new Random(int.Parse(Guid.NewGuid().ToString().Substring(0, 8), System.Globalization.NumberStyles.HexNumber)).Next(3);
        _yPos = new Random(int.Parse(Guid.NewGuid().ToString().Substring(0, 8), System.Globalization.NumberStyles.HexNumber)).Next(3);
        CreateDynamicWpfGrid();
    }
    private void CreateDynamicWpfGrid()
    {
        // Create the Grid
        var dynamicGrid = new Grid { ShowGridLines = true };
        // Create Columns
        var gridCol1 = new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) };
        var gridCol2 = new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) };
        var gridCol3 = new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) };
        var gridCol4 = new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) };
        dynamicGrid.ColumnDefinitions.Add(gridCol1);
        dynamicGrid.ColumnDefinitions.Add(gridCol2);
        dynamicGrid.ColumnDefinitions.Add(gridCol3);
        dynamicGrid.ColumnDefinitions.Add(gridCol4);
        // Create Rows
        var gridRow1 = new RowDefinition { Height = new GridLength(1, GridUnitType.Star) };
        var gridRow2 = new RowDefinition { Height = new GridLength(1, GridUnitType.Star) };
        var gridRow3 = new RowDefinition { Height = new GridLength(1, GridUnitType.Star) };
        var gridRow4 = new RowDefinition { Height = new GridLength(1, GridUnitType.Star) };
        dynamicGrid.RowDefinitions.Add(gridRow1);
        dynamicGrid.RowDefinitions.Add(gridRow2);
        dynamicGrid.RowDefinitions.Add(gridRow3);
        dynamicGrid.RowDefinitions.Add(gridRow4);

        // Bind Buttons and Grid Cells
        int j = 0;
        var imgList = Randomizer();
        for (var i = 0; i < 16; i++)
        {
            if (i % 4 != _xPos || _yPos != i / 4)
            {
                //Add image in a button
                Buttons[j].Content = imgList[j];
                Buttons[j].Click += Button_Click;
                Grid.SetColumn(Buttons[j], i%4);
                Grid.SetRow(Buttons[j], i/4);
                dynamicGrid.Children.Add(Buttons[j]);
                j++;
            }
        }
        // Display grid into a Window
        RootWindow.Content = dynamicGrid;
    }
    private void Button_Click(object sender, RoutedEventArgs e)
    {
        var button = (Button)sender;
        var x = Grid.GetColumn(button);
        var y = Grid.GetRow(button);
        if ((Abs(_xPos - x) != 1 || Abs(_yPos - y) != 0) && (Abs(_yPos - y) != 1 || Abs(_xPos - x) != 0)) return;
        Grid.SetColumn(button, _xPos);
        Grid.SetRow(button, _yPos);
        _xPos = x;
        _yPos = y;
    }
    private List<Image> Randomizer()
    {
        var imageList = CropImage();
        var randomImageList = new List<Image>(15);
        for (var i = 0; i < 15; i++)
        {
            var pos = new Random(int.Parse(Guid.NewGuid().ToString().Substring(0, 8), System.Globalization.NumberStyles.HexNumber)).Next(imageList.Count);
            randomImageList.Add(imageList[pos]);
            imageList.RemoveAt(pos);
        }
        return randomImageList;
    }
    private Bitmap ResizeImage(Image image)
    {
        var destRect = new Rectangle(0, 0, (int)RootWindow.Width ,(int) RootWindow.Height );
        var destImage = new Bitmap((int)RootWindow.Width, (int)RootWindow.Height);
        destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
        using (var graphics = Graphics.FromImage(destImage))
        {
            graphics.CompositingMode = CompositingMode.SourceCopy;
            graphics.CompositingQuality = CompositingQuality.HighQuality;
            graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphics.SmoothingMode = SmoothingMode.HighQuality;
            graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
            using (var wrapMode = new ImageAttributes())
            {
                wrapMode.SetWrapMode(WrapMode.TileFlipXY);
                graphics.DrawImage(image, destRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
            }
        }
        return destImage;
    }
    private List<Image> CropImage()
    {
        var imgList = new List<Image>(16);
        var img = (Image)ResizeImage(Image.FromFile(@"D:'Documents'Шаг'Программы WPF'Quizz'Quizz'Resources'Image.jpeg"));
        for (int i = 0; i < 4; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                var index = i * 4 + j;
                imgList.Add(new Bitmap(80, 80));
                var graphics = Graphics.FromImage(imgList[index]);
                graphics.DrawImage(img, new Rectangle(0, 0, 80, 80), new Rectangle(i * 80, j * 80, 80, 80), GraphicsUnit.Pixel);
                graphics.Dispose();
            }
        }
        imgList.RemoveAt(imgList.Count - 1);
        return imgList;
    }
}
}

这是我的主窗口。xaml代码:

<Window x:Class="Quizz.MainWindow"
    Title="Пятнашки"       Icon="pack://application:,,,/Quizz;component/resources/Icon.ico"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="320" Width="320"
    Name="RootWindow" ResizeMode="NoResize"
    Loaded="MainWindow_Loaded">
</Window>

我做错了什么?