如何将文件从服务器文件夹保存到本地驱动器/客户端？

Question

I have a formed file in some folder on server. I need to create some solution to allow user save this file local on drive on computer.

Can anyone advice me how it can be done, what control I should use.

Answer 1

This will open the Browser SaveAs dialog:

 protected void Page_Load(object sender, EventArgs e)
{  

    FileStream fs = File.OpenRead(Server.MapPath("~/imgName.jpg"));
    byte[] buffer = new byte[(int)fs.Length];
    fs.Read(buffer, 0, (int)fs.Length);
    fs.Close();
    SetResponse("imgName");
    HttpContext.Current.Response.BinaryWrite(buffer);
    HttpContext.Current.Response.Flush();
    HttpContext.Current.Response.Close();
}

private static void SetResponse(string fileName)
{
    string attachment = "attachment; filename=" + fileName + ".jpg";
    HttpContext.Current.Response.Clear();
    HttpContext.Current.Response.ClearHeaders();
    HttpContext.Current.Response.ClearContent();
    HttpContext.Current.Response.AddHeader("content-disposition", attachment);
    HttpContext.Current.Response.ContentType = "image/jpeg";
    HttpContext.Current.Response.AddHeader("Pragma", "public");
}

try opening the FileStream with this permissions:

  FileStream fs = new FileStream(Server.MapPath("~/imgName.jpg"), FileMode.Open, FileAccess.Read, FileShare.Read);

Answer 2

You will just need to put a link of your file in aspx page.

<a href="path to your file on server">some text here</a>

When user click on this link they will got the download dialog box using which they can save the file to there local system.