1     /// <summary>
 2     /// Image(支持 XML 序列化)
 3     /// </summary>
 4     [XmlRoot("XmlImage")]
 5     public class XmlImage : IXmlSerializable
 6     {
 7         public System.Drawing.Image Image { get; set; }
 8
 9         #region 构造函数
10
11         public XmlImage()
12         { }
13
14         protected XmlImage(SerializationInfo info, StreamingContext context)
15         { }
16         #endregion 构造函数
17
18         #region IXmlSerializable Members
19         public XmlSchema GetSchema() => null;
20
21         /// <summary>
22         ///     从对象的 XML 表示形式生成该对象(反序列化)
23         /// </summary>
24         /// <param name="xr"></param>
25         public void ReadXml(XmlReader xr)
26         {
27             if (xr.IsEmptyElement)
28                 return;
29             xr.ReadToFollowing(nameof(XmlImage));
30             Image = FromBase64String(xr.ReadElementContentAsString());
31             xr.ReadEndElement();
32         }
33
34         /// <summary>
35         ///     将对象转换为其 XML 表示形式(序列化)
36         /// </summary>
37         /// <param name="xw"></param>
38         public void WriteXml(XmlWriter xw)
39         {
40             xw.WriteStartElement(nameof(XmlImage));
41             xw.WriteValue(ToBase64String(Image, ImageFormat.Png));
42             xw.WriteEndElement();
43         }
44         #endregion IXmlSerializable Members
45
46         private static string ToBase64String(System.Drawing.Image img, ImageFormat format)
47         {
48             if (img != null)
49             {
50                 using (var ms = new MemoryStream())
51                 {
52                     img.Save(ms, format);
53                     byte[] buffer = ms.ToArray();
54                     return Convert.ToBase64String(buffer);
55                 }
56             }
57             return string.Empty;
58         }
59
60         private static System.Drawing.Image FromBase64String(string base64Str)
61         {
62             System.Drawing.Image img = null;
63             using (var ms = new MemoryStream())
64             {
65                 try
66                 {
67                     var buffer = Convert.FromBase64String(base64Str);
68                     ms.Write(buffer, 0, buffer.Length);
69                     img = System.Drawing.Image.FromStream(ms);
70                 }
71                 catch
72                 {
73                     // ignored
74                 }
75             }
76             return img;
77         }
78     }