代碼如下:
  //TransmitFile實現下載
    protected void Button1_Click(object sender, EventArgs e)
    {
        /*
        微軟為Response對象提供了一個新的方法TransmitFile來解決使用Response.BinaryWrite
        下載超過400mb的文件時導致Aspnet_wp.exe進程回收而無法成功下載的問題。
        代碼如下：
        */
        Response.ContentType = "application/x-zip-compressed";
        Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
        string filename = Server.MapPath("DownLoad/z.zip");
        Response.TransmitFile(filename);
    }

    //WriteFile實現下載
    protected void Button2_Click(object sender, EventArgs e)
    {
        /*
        using System.IO;

        */
        string fileName = "asd.txt";//客戶端保存的文件名
        string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑

        FileInfo fileInfo = new FileInfo(filePath);
        Response.Clear();
        Response.ClearContent();
        Response.ClearHeaders();
        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
        Response.AddHeader("Content-Length", fileInfo.Length.ToString());
        Response.AddHeader("Content-Transfer-Encoding", "binary");
        Response.ContentType = "application/octet-stream";
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
        Response.WriteFile(fileInfo.FullName);
        Response.Flush();
        Response.End();
    }

    //WriteFile分塊下載
    protected void Button3_Click(object sender, EventArgs e)
    {
        string fileName = "aaa.txt";//客戶端保存的文件名
        string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑

        System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);