//WriteFile实现下载
    protected void Button2_Click(object sender, EventArgs e)
    {
        /*
        using System.IO;

        */
        string fileName = \"asd.txt\";//客户端保存的文件名
        string filePath = Server.MapPath(\"DownLoad/aaa.txt\");//路径

        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分块下载
    protected void Button3_Click(object sender, EventArgs e)
    {
        string fileName = \"aaa.txt\";//客户端保存的文件名
        string filePath = Server.MapPath(\"DownLoad/aaa.txt\");//路径

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

        if (fileInfo.Exists == true)
        {
            const long ChunkSize = 102400;//100K 每次读取文件，只读取100K，这样可以缓解服务器的压力
            byte[] buffer = new byte[ChunkSize];

            Response.Clear();
            System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
            long dataLengthToRead = iStream.Length;//获取下载的文件总大小
            Response.ContentType = \"application/octet-stream\";
            Response.AddHeader(\"Content-Disposition\", \"attachment; filename=\" + HttpUtility.UrlEncode(fileName));
            while (dataLengthToRead > 0 && Response.IsClientConnected)
            {
                int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
                Response.OutputStream.Write(buffer, 0, lengthRead);
                Response.Flush();
                dataLengthToRead = dataLengthToRead - lengthRead;
            }
            Response.Close();
        }
    }

    //流方式下载
    protected void Button4_Click(object sender, EventArgs e)
    {
        string fileName = \"aaa.txt\";//客户端保存的文件名
        string filePath = Server.MapPath(\"DownLoad/aaa.txt\");//路径

        //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();
        Response.ContentType = \"application/octet-stream\";
        //通知浏览器下载文件而不是打开
        Response.AddHeader(\"Content-Disposition\", \"attachment; filename=\" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();
    }

//----------------------------------------------------------

public void DownloadFile( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FileBody )
{

　　WebForm.Response.ClearHeaders();
　　WebForm.Response.Clear();
　　WebForm.Response.Expires = 0;
　　WebForm.Response.Buffer = true;
　　WebForm.Response.AddHeader(\"Accept-Language\", \"zh-tw\");
　　//\'文件名称
　　WebForm.Response.AddHeader(\"content-disposition\", \"attachment; filename=\'\"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+\"\'\");
　　WebForm.Response.ContentType = \"Application/octet-stream\";
　　//\'文件内容
　　WebForm.Response.Write(FileBody);//-----------
    WebForm.Response.End();
}

//上面这段代码是下载一个动态产生的文本文件，若这个文件已经存在于服务器端的实体路径，则可以通过下面的函数：

public void DownloadFileByFilePath( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FilePath )
{
　　WebForm.Response.ClearHeaders();
　　WebForm.Response.Clear();
　　WebForm.Response.Expires = 0;
    WebForm.Response.Buffer = true;
　　WebForm.Response.AddHeader(\"Accept-Language\", \"zh-tw\");
　　//文件名称
　　WebForm.Response.AddHeader(\"content-disposition\", \"attachment; filename=\'\" + System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +\"\'\" );
　　WebForm.Response.ContentType = \"Application/octet-stream\";
　　//文件内容
　　WebForm.Response.Write(System.IO.File.ReadAllBytes(FilePath));//---------
　　WebForm.Response.End();
}
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

--保存文档
string docName, docExtended;
Stream doc = fuDoc.FileContent;
int docLength = fuDoc.PostedFile.ContentLength;
byte[] docData = new byte[docLength];
doc.Read(docData, 0, docLength);
docExtended = fuDoc.FileName.Substring(fuDoc.FileName.IndexOf(\".\"));
if (string.IsNullOrEmpty(tbDoc.Text))
docName = fuDoc.FileName;
else
docName = tbDoc.Text + docExtended;
SafetyDocInfo data = new SafetyDocInfo(ddlSort.Text, docName, fuDoc.PostedFile.ContentType, docData);
SafetyDoc safety = new SafetyDoc();
safety.Insert(data);
tbDoc.Text = string.Empty;
－－打开文档
public void ViewSafetyDoc(string pDocSort, string pDocName)
{
OracleParameter[] parms = GetSafetyDocParm(SQL_View_SafetyDoc);
parms[0].Value = pDocSort;
parms[1].Value = pDocName;
using (OracleDataReader rdr = OracleHelper.ExecuteReader(OracleHelper.ConnectionString, CommandType.Text, SQL_View_SafetyDoc, parms))
{
while (rdr.Read())
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.Charset = \"GB2312\";
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding(\"GB2312\");
HttpContext.Current.Response.ContentType = rdr.GetString(1);
HttpContext.Current.Response.BinaryWrite((byte[])rdr[\"Doc\"]);
string FileName = rdr.GetString(0);
FileName = System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);
HttpContext.Current.Response.AppendHeader(\"Content-Disposition\", \"attachment;filename=\" + FileName);
}
}
}