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C# 文件下載四方法

2019-11-17 02:10:49
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C# 文件下載四方法

C# 文件下載四方法

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      1. 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.IO;public partial class _Default : System.Web.UI.Page{PRotected void Page_Load(object sender, EventArgs e){}//TransmitFile實現下載protected void Button1_Click(object sender, EventArgs e){Response.ContentType = "application/x-z;Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");string filename = Server.MapPath("DownLoad/z.zip");Response.TransmitFile(filename);}//WriteFile實現下載protected void Button2_Click(object sender, EventArgs e){string fileName ="asd.txt";//客戶端保存的文件名string filePath=Server.MapPath("DownLoad/aaa.txt");//路徑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分塊下載protected void Button3_Click(object sender, EventArgs e){string fileName = "aaa.txt";//客戶端保存的文件名string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);if (fileInfo.Exists == true){const long ChunkSize = 102400;//100K 每次讀取文件，只讀取100K，這樣可以緩解服務器的壓力byte[] buffer = new byte[ChunkSize];Response.Clear();System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);long dataLengthToRead = iStream.Length;//獲取下載的文件總大小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));//讀取的大小Response.OutputStream.Write(buffer, 0, lengthRead);Response.Flush();dataLengthToRead = dataLengthToRead - lengthRead;}Response.Close();}}//流方式下載protected 
      



      

      

      

      


      


      

      


      

      

      
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