//圖片轉為base64編碼的字符串
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;
}
}
//threeebase64編碼的字符串轉為圖片
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;
}
}
//圖片轉為base64編碼的字符串
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;
}
}
//threeebase64編碼的字符串轉為圖片
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: 圖片直接顯示
string Base64String = "";//太長就不貼出來了
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:轉換成圖片另存為然后圖片顯示出來
string dd = "";//太長就不貼出來了
var bytes = Convert.FromBase64String(dd);
using (var imageFile = new FileStream(@"d:\Hello1.jpg", FileMode.Create))
{
imageFile.Write(bytes, 0, bytes.Length);
imageFile.Flush();
}
//5://直接轉換存為路徑下圖片
string base64Str=""/
e[] bytes = System.Convert.FromBase64String(dd);
File.WriteAllBytes(@"d:\newfile.jpg", bytes);
string filePath = @"d:\MyImage.jpg";
File.WriteAllBytes(filePath, Convert.FromBase64String(base64Str));
6:多張base64圖片轉換為圖片另存為
public string Base64ToImage(string upimgPath, string base64String)
{
string goodspath = Server.MapPath(upimgPath); //用來生成文件夾
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)