ASP.NET下載檔案(彈出開啟儲存檔案對話方塊)

看了好多種方法

好像都是通過Response轉換來的

 

Code
public void Open()
    {
 
        string FullFileName = "";
        
        //ASP.NET下載檔案(彈出開啟儲存檔案對話方塊) 
        //fileURL為帶路徑的檔案全名 
        /*
        string fileURL = url;
        System.IO.FileInfo fileInfo = new System.IO.FileInfo(fileURL); 
        Response.Clear(); 
        Response.AddHeader("content-disposition","attachment;filename="+Server.UrlEncode(fileInfo.Name.ToString())); 
        Response.AddHeader("content-length",fileInfo.Length.ToString()); 
        Response.ContentType = "application/octet-stream"; 
        Response.ContentEncoding = System.Text.Encoding.Default; 
        Response.WriteFile(fileURL); 
         */

        //無錯版: 
        try
        {
            string FileName = ".//路徑//書名.pdf";
            FileName = ".//路徑//檔案名稱.副檔名";
            FullFileName = Server.MapPath(FileName); 
            //FileName--要下載的檔案名稱 
            FileInfo DownloadFile = new FileInfo(FullFileName);
            if (DownloadFile.Exists)
            {
                Response.Clear();
                Response.ClearHeaders();
                Response.Buffer = false;
                Response.ContentType = "application/octet-stream";
                Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.ASCII));
                Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
                Response.WriteFile(DownloadFile.FullName);
                Response.Flush();
                Response.End();
            }
            else
            {
                //檔案不存在
            }
        }
        catch
        {
           //開啟時異常了
        } 

    }