C#四种下载文件方法

Button5事件在我本机测试有问题。大家可以再看看。

//TransmitFile下载

protected void Button1_Click(object sender, EventArgs e)

{

//Response.ContentType = "application/x-zip-compressed";

Response.AddHeader("Content-Disposition", "attachment;filename=1.txt");

string filename = Server.MapPath("/UpLoadFile/1.txt");

Response.TransmitFile(filename);

}

//WriteFile下载

protected void Button2_Click(object sender, EventArgs e)

{

string fileName = "1.txt";//客户端保存的文件名

string filePath = Server.MapPath("/UpLoadFile/1.txt");//路径

FileInfo fileInfo = new FileInfo(filePath);

Response.Clear();

Response.ClearContent();

Response.ClearHeaders();

Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName); //加上这行可下载txt文档(通知浏览器是下载文件而不是打开)

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("/UpLoadFile/1.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("/UpLoadFile/1.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();

}

//保存文件并打开

protected void Button5_Click(object sender, EventArgs e)

{

//string filePath = Server.MapPath("/UpLoadFile/");//路径

////这里输入你要下载的url地址

//string remoteUri = filePath;

////输入下载的文件名称

//string fileName = "pic.jpg", myStringWebResource = null;

////创建WebClient实例

//WebClient myWebClient = new WebClient();

//// web地址全名

//myStringWebResource = remoteUri + fileName;

//Console.WriteLine("Downloading File \"{0}\" from \"{1}\" .......\n\n", fileName, myStringWebResource);

//// 下载保存文件到程序运行目录下

//myWebClient.DownloadFile(myStringWebResource, fileName);

//Console.WriteLine("Successfully Downloaded File \"{0}\" from \"{1}\"", fileName, myStringWebResource);

//Console.WriteLine("\nDownloaded file saved in the following file system folder:\n\t" + Application.StartupPath);

//// 打开文件

//Process myProcess = new Process();

//myProcess.StartInfo.FileName = Application.StartupPath + "\\" + fileName;

//myProcess.StartInfo.Verb = "Open";

//myProcess.StartInfo.CreateNoWindow = true;

//myProcess.Start();

}