Response.AddHeader实现下载

/// <summary>
/// Response.AddHeader实现下载
/// </summary>
/// <param name="filePath">完整的文件路径</param>
/// <param name="fileName">文件名</param>
private void DownFile(string filePath, string fileName)
{
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();
}