Asp.net實現附件下載（亂碼解決）

代碼

    private void Page_Load(object sender, System.EventArgs e)
    {
if (Request.QueryString["Recordid"] != null && Request.QueryString["Recordid"].ToString() != "")
        {
            StarTech.DBUtility.AdoHelper adoHelper = StarTech.DBUtility.AdoHelper.CreateHelper("News_Instance");
            System.Data.DataTable resourceDs = adoHelper.ExecuteSqlDataset("Select * From t_news_resource Where Recordid='" + Request.QueryString["Recordid"].ToString() + "'").Tables[0];
if (resourceDs.Rows.Count > 0)
            {
string filepath = this.MapPath(resourceDs.Rows[0]["path"].ToString());
byte[] ByteFile = GetFileByte(filepath);
if (ByteFile != null)
                {
string FileType = System.IO.Path.GetExtension(filepath);
string FileName = System.IO.Path.GetFileName(filepath);
                    Response.Clear();
                    Response.HeaderEncoding = System.Text.Encoding.Default;
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + FileName);
                    Response.AddHeader("Content-Length", ByteFile.Length.ToString());
                    Response.ContentType = CheckType(FileType);
                    Response.BinaryWrite(ByteFile);
                    Response.End();
                }
else
                {
                    Response.Write("<font color=red>找不到相關附件！【<a href='javascript:window.opener = null;window.close()'>關閉</a>】</font>");
                }
            }
        }
else
        {
            Response.Write("<font color=red>參數錯誤或者許可權不夠  【<a href='javascript:window.close()'>關閉</a>】</font>");
        }
    }
//擷取檔案二進位流
    private Byte[] GetFileByte(string path)
    {
try
        {
            System.IO.FileStream file = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read);
            Byte[] imgByte = new Byte;
            file.Read(imgByte, 0, imgByte.Length);
            file.Close();
return imgByte;
        }
catch (Exception ex)
        {
string str = ex.Message;
return null;
        }
    }
/// <summary>
/// 根據檔案的副檔名來擷取對應的"輸出資料流的HTTP MIME"類型
/// </summary>
/// <param name="FileType"></param>
/// <returns></returns>
    private string CheckType(string FileType)
    {
string ContentType;
switch (FileType.ToLower())
        {
case ".asf ":
                ContentType = "video/x-ms-asf ";
break;
case ".avi ":
                ContentType = "video/avi ";
break;
case ".doc ":
                ContentType = "application/msword "; break;
case ".zip ":
                ContentType = "application/zip "; break;
case ".xls ":
                ContentType = "application/vnd.ms-excel "; break;
case ".gif ":
                ContentType = "image/gif "; break;
case ".jpg ":
                ContentType = "image/jpeg "; break;
case "jpeg ":
                ContentType = "image/jpeg "; break;
case ".wav ":
                ContentType = "audio/wav "; break;
case ".mp3 ":
                ContentType = "audio/mpeg3 "; break;
case ".mpg ":
                ContentType = "video/mpeg "; break;
case ".mepg ":
                ContentType = "video/mpeg "; break;
case ".rtf ":
                ContentType = "application/rtf "; break;
case ".html ":
                ContentType = "text/html "; break;
case ".htm ":
                ContentType = "text/html "; break;
case ".txt ":
                ContentType = "text/plain "; break;
default:
                ContentType = "application/octet-stream ";
break;
        }
return ContentType;
    }