关于asp.net 下载文件有中文出现乱码的问题

[hebaobao19880921]

protected void FN_ResponseFile()
        {
            string id = Request["id"].ToString();
            NRBLL.File bf = new Asiastar.NRBLL.File();
            Guid guid = new Guid(id);
            System.IO.Stream iStream = null;
            byte[] buffer = new Byte[10000];
            string path = bf.FN_SerchPathByFileId(guid).Tables["ds"].Rows[0]["FilePath"].ToString();//这是从数据库取的完整路径 .
            int length;
            long dataToRead;
            string filename = System.IO.Path.GetFileName(path);
            try
            {
                if (Request.UserAgent.Contains("MSIE") || Request.UserAgent.Contains("msie"))
                {
                    filename = ToHexString(filename);
                }
                iStream = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
                dataToRead = iStream.Length; Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.GetEncoding("GB2312")));
                while (dataToRead > 0)
                {
                    if (Response.IsClientConnected)
                    {
                        length = iStream.Read(buffer, 0, 10000);
                        Response.OutputStream.Write(buffer, 0, length);
                        Response.Flush();
                        buffer = new Byte[10000];
                        dataToRead = dataToRead - length;
                    }
                    else
                    {
                        dataToRead = -1;
                    }
                }
            }
            catch (Exception ex)
            {
                Response.Write("文件下载时出现错误!");
            }
            finally
            {
                if (iStream != null)
                {
                    iStream.Close();
                }
            }
        }
        /// <summary>
        /// 为字符串中的非英文字符编码
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string ToHexString(string s)
        {
            char[] chars = s.ToCharArray();
            StringBuilder builder = new StringBuilder();
            for (int index = 0; index < chars.Length; index++)
            {
                bool needToEncode = NeedToEncode(chars[index]);
                if (needToEncode)
                {
                    string encodedString = ToHexString(chars[index]);
                    builder.Append(encodedString);
                }
                else
                {
                    builder.Append(chars[index]);
                }
            }

            return builder.ToString();
        }

        /// <summary>
        ///指定 一个字符是否应该被编码
        /// </summary>
        /// <param name="chr"></param>
        /// <returns></returns>
        private static bool NeedToEncode(char chr)
        {
            string reservedChars = "$-_.+!*'(),@=&";

            if (chr > 127)
                return true;
            if (char.IsLetterOrDigit(chr) || reservedChars.IndexOf(chr) >= 0)
                return false;

            return true;
        }

        /// <summary>
        /// 为非英文字符串编码
        /// </summary>
        /// <param name="chr"></param>
        /// <returns></returns>
        private static string ToHexString(char chr)
        {
            UTF8Encoding utf8 = new UTF8Encoding();
            byte[] encodedBytes = utf8.GetBytes(chr.ToString());
            StringBuilder builder = new StringBuilder();
            for (int index = 0; index < encodedBytes.Length; index++)
            {
                builder.AppendFormat("%{0}", Convert.ToString(encodedBytes[index], 16));
            }
            return builder.ToString();
        }

在网上找到了这个解决办法 不知道为什么还是乱码- -

[孟子E章]

是内容乱还是文件名乱？

[孟子E章]

文件名的处理方法

String ExportFileName = "中文文件名";
if (Request.Browser.Browser.IndexOf("MSIE") > -1)
{
ExportFileName = Server.UrlEncode(ExportFileName);
}

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