直接读取出来是Bitmap类型 xmal 中无法直接转换，我们需要编写一个转换器

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;
using System.Windows.Interop;
using System.Windows.Media.Imaging;

namespace MyApp
{

    class ResourceToSourceConverter : IValueConverter
    {

        [DllImport("gdi32.dll", SetLastError = true)]
        private static extern bool DeleteObject(IntPtr hObject);


        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
            {
                return null;
            }
            Bitmap bitmap = (Bitmap)value;
            IntPtr hBitmap = bitmap.GetHbitmap();
            BitmapSource bitmapSource = Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
            //DeleteObject 处理内存泄漏问题
            return !DeleteObject(hBitmap) ? throw new Win32Exception() : bitmapSource;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

xaml 中使用

<Image Height="130">
   <Image.Source>
     <Binding Source="{x:Static res:Resources.title}">
        <Binding.Converter>
           <local:ResourceToSourceConverter />
        </Binding.Converter>
    </Binding>
  </Image.Source>
</Image>

<Page.Background>
  <ImageBrush>
    <ImageBrush.ImageSource>
      <Binding Source="{x:Static res:Resources.bg}">
        <Binding.Converter>
          <local:ResourceToSourceConverter />
        </Binding.Converter>
      </Binding>
    </ImageBrush.ImageSource>
  </ImageBrush>
</Page.Background>