怎样输出图片下载

Biegral 2006/9/18 16:11:00 1413

  // Identify the file to download including its path.
    string filepath = DownloadFileName;

    // Identify the file name.
    string filename = System.IO.Path.GetFileName(filepath);

    Response.Clear();

    // Specify the Type of the downloadable file.
    Response.ContentType = "application/octet-stream";

    // Set the Default file name in the FileDownload dialog box.
    Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);

    Response.Flush();

    // Download the file.
    Response.WriteFile(filepath);
private void ViewImage(string fileName, bool forceDownload)
  {
   Response.Clear();
   if(forceDownload)
   {
    Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);
   }
   else
   {
    Response.AppendHeader("Content-Disposition", "filename=" + fileName);
   }

   using(System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(ImageFolder + "/" + fileName)))
   {
    if(image.RawFormat.Equals(ImageFormat.Bmp))
    {
     Response.ContentType = "image/bmp";
    }
    else
    {
     if(image.RawFormat.Equals(ImageFormat.Gif))
     {
      Response.ContentType = "image/gif";
     }
     else
     {
      if(image.RawFormat.Equals(ImageFormat.Jpeg))
      {
       Response.ContentType = "image/jpeg";
      }
      else
      {
       if(image.RawFormat.Equals(ImageFormat.Png))
       {
        Response.ContentType = "image/png";
       }
       else
       {
        Response.ContentType = "application/octet-stream";
       }
      }
     }
     image.Save(Response.OutputStream, image.RawFormat);
    }
   }
  }
利用上面的方法输出的图片,可以控制是查看还是下载.
private void ViewImage(string fileName, bool forceDownload) 
{ 
Response.Clear(); 
if(forceDownload) 
{ 
Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName); 
} 
else 
{ 
Response.AppendHeader("Content-Disposition", "filename=" + fileName); 
} 

using(System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(ImageFolder + "/" + fileName))) 
{ 
if(image.RawFormat.Equals(ImageFormat.Bmp)) 
{ 
Response.ContentType = "image/bmp"; 
} 
else 
{ 
if(image.RawFormat.Equals(ImageFormat.Gif)) 
{ 
Response.ContentType = "image/gif"; 
} 
else 
{ 
if(image.RawFormat.Equals(ImageFormat.Jpeg)) 
{ 
Response.ContentType = "image/jpeg"; 
} 
else 
{ 
if(image.RawFormat.Equals(ImageFormat.Png)) 
{ 
Response.ContentType = "image/png"; 
} 
else 
{ 
Response.ContentType = "application/octet-stream"; 
} 
} 
} 

image.Save(Response.OutputStream, image.RawFormat); 
} 
} 
}
 
本文转载:CSDN博客

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