[英]download file from server asp.net
我想将文件从服务器下载到本地主机。
我有一个网上的代码,该代码应该可以工作但不能正常工作
protected void Button4_Click(object sender, EventArgs e)
{
//To Get the physical Path of the file(test.txt)
string filepath = Server.MapPath("test.txt");
// Create New instance of FileInfo class to get the properties of the file being downloaded
FileInfo myfile = new FileInfo(filepath);
// Checking if file exists
if (myfile.Exists)
{
// Clear the content of the response
Response.ClearContent();
// Add the file name and attachment, which will force the open/cancel/save dialog box to show, to the header
Response.AddHeader("Content-Disposition", "attachment; filename=" + myfile.Name);
// Add the file size into the response header
Response.AddHeader("Content-Length", myfile.Length.ToString());
// Set the ContentType
Response.ContentType = ReturnExtension(myfile.Extension.ToLower());
// Write the file into the response (TransmitFile is for ASP.NET 2.0. In ASP.NET 1.1 you have to use WriteFile instead)
Response.TransmitFile(myfile.FullName);
// End the response
Response.End();
}
}
private string ReturnExtension(string fileExtension)
{
switch (fileExtension)
{
case ".htm":
case ".html":
case ".log":
return "text/HTML";
case ".txt":
return "text/plain";
case ".doc":
return "application/ms-word";
case ".tiff":
case ".tif":
return "image/tiff";
case ".asf":
return "video/x-ms-asf";
case ".avi":
return "video/avi";
case ".zip":
return "application/zip";
case ".xls":
case ".csv":
return "application/vnd.ms-excel";
case ".gif":
return "image/gif";
case ".jpg":
case "jpeg":
return "image/jpeg";
case ".bmp":
return "image/bmp";
case ".wav":
return "audio/wav";
case ".mp3":
return "audio/mpeg3";
case ".mpg":
case "mpeg":
return "video/mpeg";
case ".rtf":
return "application/rtf";
case ".asp":
return "text/asp";
case ".pdf":
return "application/pdf";
case ".fdf":
return "application/vnd.fdf";
case ".ppt":
return "application/mspowerpoint";
case ".dwg":
return "image/vnd.dwg";
case ".msg":
return "application/msoutlook";
case ".xml":
case ".sdxl":
return "application/xml";
case ".xdp":
return "application/vnd.adobe.xdp+xml";
default:
return "application/octet-stream";
}
}
现在,当单击按钮时,应该将文件从服务器下载到本地主机...但是似乎什么也没有发生...
我在serer的桌面上有test.txt ...保存文件选项也不在客户端上。
我发布文件并将其放在服务器的inetpub文件夹中,并从客户端运行GUI。
任何建议...请帮助
这个程序下载一个文件,如果它在inetpub文件夹中..我想从服务器内的任何位置下载...
??
“写在”按钮上,单击要下载文件的位置
protected void Button1_Click(object sender, EventArgs e)
{
string allowedExtensions = ".mp4,.pdf,.m4v,.gif,.jpg,.png,.swf,.css,.htm,.html,.txt";
// edit this list to allow file types - do not allow sensitive file types like .cs or .config
string fileName = "Images/apple.jpg";
string filePath = "";
//if (Request.QueryString["file"] != null) fileName = Request.QueryString["file"].ToString();
//if (Request.QueryString["path"] != null) filePath = Request.QueryString["path"].ToString();
if (fileName != "" && fileName.IndexOf(".") > 0)
{
bool extensionAllowed = false;
// get file extension
string fileExtension = fileName.Substring(fileName.LastIndexOf('.'), fileName.Length - fileName.LastIndexOf('.'));
// check that we are allowed to download this file extension
string[] extensions = allowedExtensions.Split(',');
for (int a = 0; a < extensions.Length; a++)
{
if (extensions[a] == fileExtension)
{
extensionAllowed = true;
break;
}
}
if (extensionAllowed)
{
// check to see that the file exists
if (File.Exists(Server.MapPath(filePath + '/' + fileName)))
{
// for iphones and ipads, this script can cause problems - especially when trying to view videos, so we will redirect to file if on iphone/ipad
// if (Request.UserAgent.ToLower().Contains("iphone") || Request.UserAgent.ToLower().Contains("ipad")) { Response.Redirect(filePath + '/' + fileName); }
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=" + fileName);
Response.WriteFile(Server.MapPath(filePath + '/' + fileName));
Response.End();
}
else
{
litMessage.Text = "File could not be found";
}
}
else
{
litMessage.Text = "File extension is not allowed";
}
}
else
{
litMessage.Text = "Error - no file to download";
}
}
您提到test.txt在服务器的桌面上。 它也位于您要测试的页面旁边吗? 尝试完全限定到桌面的路径(“ C:\\ Documents and Settings \\ JohnDoe \\ Desktop \\ test.txt”),或将文件复制到.aspx页旁边。
您可以将文件夹更改到您的位置:
Directory.SetCurrentDirectory(HttpContext.Current.Server.MapPath("~ your path in here")
好的,所以我把一个Response.Write之后
string filepath = Server.MapPath("test.txt");
并发现文件路径指向inetpub文件夹...因此,当我将test.txt放入该文件夹时,它起作用了...所以程序正确。
但是现在如果文件在服务器中的任何其他位置,我应该如何修改程序...我正在使用它,但是欢迎任何建议
好吧,我也能找到任何答案
我删除了server.mappath并放置了完整位置。.之前不知道为什么会出现问题..但现在它可以工作了...
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