C# base64 Img 互转 

 1 [AcceptVerbs(HttpVerbs.Post)]
 2 public JsonResult Upload(HttpPostedFileBase fileData)
 3 {
 4 try
 5 {
 6 if (fileData != null)
 7 {
 8 string ext = Path.GetExtension(fileData.FileName).Remove(0, 1); // 文件扩展名
 9 Image img = Image.FromStream(fileData.InputStream);
10 Bitmap bmp = new Bitmap(img);
11 MemoryStream stream = new MemoryStream();
12 bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
13 stream.Position = 0;
14 byte[] data = new byte[stream.Length];
15 stream.Read(data, 0, (int)stream.Length);
16 stream.Close();
17 string base64String = "data:" + ext + ";base64," + Convert.ToBase64String(data, 0, data.Length);
18 return Json(base64String, JsonRequestBehavior.AllowGet);
19 }
20 }
21 catch (Exception)
22 {
23 }
24 return Json(null, JsonRequestBehavior.AllowGet);
25 }
26 public string Base64ToImg(string base64)
27 {
28 try
29 {
30 int len = base64.IndexOf("base64,") + 7;
31 int len1 = base64.IndexOf("data:") + 5;
32 string ext = base64.Substring(len1, len - len1 - 8);
33 string filePath = "/Content/newsImg/" + DateTime.Now.ToString("yyyyMMddHHmmssfff.") + ext;
34 base64 = base64.Remove(0, len);
35 byte[] arr = Convert.FromBase64String(base64);
36 MemoryStream ms = new MemoryStream(arr);
37 Bitmap bmp = new Bitmap(ms);
38 bmp.Save(Server.MapPath(filePath), ext.ToLower().Contains("png") ? System.Drawing.Imaging.ImageFormat.Png : System.Drawing.Imaging.ImageFormat.Jpeg);
39 ms.Close();
40 return filePath;
41 }
42 catch (Exception)
43 {
44 }
45 return "";
46 }
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posted @ 2015-09-11 18:29  灰色雨逸  阅读(1551)  评论(0)  编辑  收藏  举报