C#实现站点文件的防盗链

//download.aspx.cs

protected void Page_Load(object sender, EventArgs e)

{

String fileUrl = Request.QueryString["file"].Trim().Replace("~", "");

string DownloadFileName = Server.MapPath("~") + fileUrl;

string filepath = DownloadFileName;

string filename = System.IO.Path.GetFileName(filepath);

Response.Clear();

Response.ContentType = "application/octet-stream";

Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);

Response.Flush();

Response.WriteFile(filepath);

}