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這篇文章主要介紹asp.net+C#如何實現下載文件,文中介紹的非常詳細,具有一定的參考價值,感興趣的小伙伴們一定要看完!
代碼如下:
protected void Button1_Click(object sender, EventArgs e)
{
/*
微軟為Response對象提供了一個新的方法TransmitFile來解決使用Response.BinaryWrite
下載超過400mb的文件時導致Aspnet_wp.exe進程回收而無法成功下載的問題。
代碼如下:
*/Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
string filename = Server.MapPath("DownLoad/aaa.zip");
Response.TransmitFile(filename);
}//WriteFile實現下載
protected void Button2_Click(object sender, EventArgs e)
{
/*
using System.IO;
*/string fileName ="aaa.zip";//客戶端保存的文件名
string filePath=Server.MapPath("DownLoad/aaa.zip");//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.zip";//客戶端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.zip");//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 void Button4_Click(object sender, EventArgs e)
{
string fileName = "aaa.zip";//客戶端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.zip");//路徑//以字符流的形式下載文件
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";
//通知瀏覽器下載文件而不是打開
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();}
C#是一個簡單、通用、面向對象的編程語言,它由微軟Microsoft開發,繼承了C和C++強大功能,并且去掉了一些它們的復雜特性,C#綜合了VB簡單的可視化操作和C++的高運行效率,以其強大的操作能力、優雅的語法風格、創新的語言特性和便捷的面向組件編程從而成為.NET開發的首選語言,但它不適用于編寫時間急迫或性能非常高的代碼,因為C#缺乏性能極高的應用程序所需要的關鍵功能。
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