文件流方式下载文件

FileDU.UploadDown(url, name);

/// <summary>
/// 下载文件，根据文件所在路径
/// </summary>
/// <param name="path">文件路径</param>
/// <param name="name">文件名</param>
public static void UploadDown(string path, string name)
{
//流方式下载文件
string fileName = name;//客户端保存的文件名
string filePath = HttpContext.Current.Server.MapPath(path);//路径
string extension = filePath.Substring(filePath.LastIndexOf('.') + 1);
string file = filePath.Substring(filePath.LastIndexOf('\\')+1);
//以字符流的形式下载文件
FileStream fs = new FileStream(filePath, FileMode.Open);
byte[] bytes = new byte[(int)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
HttpContext.Current.Response.ContentType = "application/octet-stream";
//HttpContext.Current.Response.ContentType = getContentType(extension);
//通知浏览器下载文件而不是打开
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(file, System.Text.Encoding.UTF8));
HttpContext.Current.Response.BinaryWrite(bytes);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}