C#图片转字符串------>>>>字符串在转回图片两种方法

 C#图片转字符串------>>>>字符串在转回图片两种方法

 1  #region 调用方法
 2         private void Form1_Load(object sender, EventArgs e)
 3         {
 4             OpenFileDialog dialog = new OpenFileDialog();
 5             dialog.Multiselect = true;//该值确定是否可以选择多个文件
 6             dialog.Title = "请选择文件夹";
 7             dialog.Filter = "所有文件(*.*)|*.*";
 8             if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
 9             {
10                 string file = dialog.FileName;
11                 var imageString = ImageConvertString(file);
12                 var iamgePath = StringToImage(imageString);
13 
14                 var downImageString = DownloadImageConvertString(file);
15                 var downIamgePath = StringConvertImage(imageString);
16             }
17         } 
18         #endregion
19         #region 网络图片转换
20         public string DownloadImageConvertString(string imagepath)
21         {
22             using (System.Net.WebClient wc = new System.Net.WebClient())
23             {
24                 wc.Headers.Add("User-Agent", "Chrome");
25                 return Convert.ToBase64String(wc.DownloadData(imagepath));
26             }
27         }
28         public static string StringConvertImage(string buffer, string fileName = "bg_print1")
29         {
30             string path = string.Format("{0}/{1}{2}.png", System.Environment.CurrentDirectory, System.DateTime.Now.ToString("yyyyMMddHHmmss"), fileName);
31             byte[] bytes = Convert.FromBase64String(buffer);
32             MemoryStream ms = new MemoryStream();
33             ms.Write(bytes, 0, bytes.Length);
34             Bitmap bmp = new Bitmap(ms);
35             if (Directory.Exists(path))
36             {
37                 Directory.Delete(path);
38             }
39             bmp.Save(path);
40             return path;
41         } 
42         #endregion
43         #region 本地图片转换
44         /// <summary>
45         /// Base64String转本地图片
46         /// </summary>
47         /// <param name="buffer">Base64String</param>
48         /// <param name="fileName">文件名</param>
49         /// <returns></returns>
50         public static string StringToImage(string buffer, string fileName = "bg_print2")
51         {
52             string path = string.Format("{0}/{1}{2}.png", System.Environment.CurrentDirectory, System.DateTime.Now.ToString("yyyyMMddHHmmss"), fileName);
53             using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(buffer)))
54             {
55                 using (Image image = System.Drawing.Image.FromStream(ms))
56                 {
57                     if (Directory.Exists(path))
58                     {
59                         Directory.Delete(path);
60                     }
61                     image.Save(path);
62                     return path;
63                 }
64             }
65         }
66         /// <summary>
67         /// 本地图片文件转Base64字符串
68         /// </summary>
69         /// <param name="imagepath">本地文件路径</param>
70         /// <returns>Base64String</returns>
71         public string ImageConvertString(string imagepath)
72         {
73             using (FileStream fs = new FileStream(imagepath, FileMode.Open))
74             {
75                 byte[] byData = new byte[fs.Length];
76                 fs.Read(byData, 0, byData.Length);
77                 fs.Close();
78                 return Convert.ToBase64String(byData);
79             }
80         } 
81         #endregion