Image(支持 XML 序列化)，注意C#中原生的Image类是无法进行Xml序列化的

     /// <summary>
     /// Image(支持 XML 序列化)
     /// </summary>
     [XmlRoot("XmlImage")]
     public class XmlImage : IXmlSerializable
     {
         public System.Drawing.Image Image { get; set; }

         #region 构造函数

         public XmlImage()
         { }

         protected XmlImage(SerializationInfo info, StreamingContext context)
         { }
         #endregion 构造函数

         #region IXmlSerializable Members
         public XmlSchema GetSchema() => null;

         /// <summary>
         ///     从对象的 XML 表示形式生成该对象(反序列化)
         /// </summary>
         /// <param name="xr"></param>
         public void ReadXml(XmlReader xr)
         {
             if (xr.IsEmptyElement)
                 return;
             xr.ReadToFollowing(nameof(XmlImage));
             Image = FromBase64String(xr.ReadElementContentAsString());
             xr.ReadEndElement();
         }

         /// <summary>
         ///     将对象转换为其 XML 表示形式(序列化)
         /// </summary>
         /// <param name="xw"></param>
         public void WriteXml(XmlWriter xw)
         {
             xw.WriteStartElement(nameof(XmlImage));
             xw.WriteValue(ToBase64String(Image, ImageFormat.Png));
             xw.WriteEndElement();
         }
         #endregion IXmlSerializable Members

         private static string ToBase64String(System.Drawing.Image img, ImageFormat format)
         {
             if (img != null)
             {
                 using (var ms = new MemoryStream())
                 {
                     img.Save(ms, format);
                     byte[] buffer = ms.ToArray();
                     return Convert.ToBase64String(buffer);
                 }
             }
             return string.Empty;
         }

         private static System.Drawing.Image FromBase64String(string base64Str)
         {
             System.Drawing.Image img = null;
             using (var ms = new MemoryStream())
             {
                 try
                 {
                     var buffer = Convert.FromBase64String(base64Str);
                     ms.Write(buffer, , buffer.Length);
                     img = System.Drawing.Image.FromStream(ms);
                 }
                 catch
                 {
                     // ignored
                 }
             }
             return img;
         }
     }