Download the instance code for the file in.net

1. //TransmitFile download

protected void Button_Click(object sender, EventArgs e)
    {
        /* 
         Microsoft is Response Object provides 1 A new approach TransmitFile To solve the use of Response.BinaryWrite 
         Download over 400mb The file time result Aspnet_wp.exe A problem with a process recall that failed to download successfully.  
         The code is as follows:  
        */ 
        Response.ContentType = "application/x-zip-compressed";
        Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
        string filename = Server.MapPath("DownLoad/z.zip");
        Response.TransmitFile(filename);
    }

2. //WriteFile download

protected void Button2_Click(object sender, EventArgs e)
    {
        /* 
        using System.IO;
        */
        string fileName = "asd.txt";// The file name saved by the client  
        string filePath = Server.MapPath("DownLoad/aaa.txt");// The path 
        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();
    }

3. //WriteFile block download

protected void Button3_Click(object sender, EventArgs e)
    {
        string fileName = "aaa.txt";// The file name saved by the client  
        string filePath = Server.MapPath("DownLoad/aaa.txt");// The path 
        System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
        if (fileInfo.Exists == true)
        {
            const long ChunkSize = 102400;//100K  Each time the file is read, only read 100K , which can relieve the pressure on the server  
            byte[] buffer = new byte[ChunkSize];
            Response.Clear();
            System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
            long dataLengthToRead = iStream.Length;// Gets the total size of the downloaded file  
            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));// Read size  
                Response.OutputStream.Write(buffer, 0, lengthRead);
                Response.Flush();
                dataLengthToRead = dataLengthToRead - lengthRead;
            }
            Response.Close();
        }
    }

4. // stream download

protected void Button4_Click(object sender, EventArgs e)
    {
        string fileName = "aaa.txt";// The file name saved by the client  
        string filePath = Server.MapPath("DownLoad/aaa.txt");// The path 
        // Download the file as a stream of characters  
        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";
        // Notifies the browser to download the file instead of opening it  
        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");
　　//' The file name 
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+"'");
　　WebForm.Response.ContentType = "Application/octet-stream";
　　//' The file content 
　　WebForm.Response.Write(FileBody);//-----------
    WebForm.Response.End();
}

// The above code is for download 1 Four dynamically generated text files. If the file already exists in the entity path on the server side, the following functions can be used: 
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");
　　// The file name 
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='" + System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +"'" );
　　WebForm.Response.ContentType = "Application/octet-stream";
　　// The file content 
　　WebForm.Response.Write(System.IO.File.Rea}dAllBytes(FilePath));//---------
　　WebForm.Response.End();
 }