C# base64 和图片互转
C# imgage图片转base64字符/base64字符串转图片另存成
//图片转为base64编码的字符串 protected string ImgToBase64String(string Imagefilename) { try { Bitmap bmp = new Bitmap(Imagefilename); MemoryStream ms = new MemoryStream(); bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); byte[] arr = new byte[ms.Length]; ms.Position = 0; ms.Read(arr, 0, (int)ms.Length); ms.Close(); return Convert.ToBase64String(arr); } catch (Exception ex) { return null; } } //base64编码的字符串转为图片 protected Bitmap Base64StringToImage(string strbase64) { try { byte[] arr = Convert.FromBase64String(strbase64); MemoryStream ms = new MemoryStream(arr); Bitmap bmp = new Bitmap(ms); bmp.Save(@"d:\test.jpg", System.Drawing.Imaging.ImageFormat.Jpeg); //bmp.Save(@"d:\"test.bmp", ImageFormat.Bmp); //bmp.Save(@"d:\"test.gif", ImageFormat.Gif); //bmp.Save(@"d:\"test.png", ImageFormat.Png); ms.Close(); return bmp; } catch (Exception ex) { return null; } }
2: 图片直接显示
3:转换成图片另存为然后图片显示出来
string Base64String = "";//太长就不贴出来了 byte[] bytes = Convert.FromBase64String(Base64String); ImageTagId.ImageUrl = "data:image/jpeg;base64," + Convert.ToBase64String(bytes);//
public System.Drawing.Image Base64ToImage(string base64String) { byte[] imageBytes = Convert.FromBase64String(base64String); MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length); ms.Write(imageBytes, 0, imageBytes.Length); System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true); return image; } 使用方法: Base64ToImage(dd).Save(Server.MapPath("Hello.jpg")); Image1.ImageUrl = "Hello.jpg";
4:直接转换存为路径下图片
string dd = "";//base64字符串 var bytes = Convert.FromBase64String(dd); using (var imageFile = new FileStream(@"d:\Hello1.jpg", FileMode.Create)) { imageFile.Write(bytes, 0, bytes.Length); imageFile.Flush(); }
5://直接转换存为路径下图片
string base64Str=""/ byte[] bytes = System.Convert.FromBase64String(dd); File.WriteAllBytes(@"d:\newfile.jpg", bytes); string filePath = @"d:\MyImage.jpg"; File.WriteAllBytes(filePath, Convert.FromBase64String(base64Str));
6:多张base64图片转换为图片另存为
public string Base64ToImage(string upimgPath, string base64String) { string goodspath = Server.MapPath(upimgPath); //用来生成文件夹 if (!Directory.Exists(goodspath)) { Directory.CreateDirectory(goodspath); } var imgPath = string.Empty; if (!string.IsNullOrEmpty(base64String)) { var splitBase = base64String.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries); foreach (var item in splitBase) { var path = upimgPath + Guid.NewGuid() + ".jpg"; string filePath = Server.MapPath(path);// Server.MapPath(upimgPath + Guid.NewGuid() + ".jpg"); File.WriteAllBytes(filePath, Convert.FromBase64String(item)); imgPath += path + ";"; } } else { imgPath = ";"; } return imgPath.TrimEnd(';'); }
使用方法:
va headimg=""; Base64ToImage("UpLoadImg/HeadImage/", headimg)