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原址：http://www.cnblogs.com/xtgyiq/archive/2009/07/06/1517415.html
protected void Button1_Click(object sender, EventArgs e)
{
1
protected void Button1_Click(object sender, EventArgs e)2
{3
//TransmitFile实现下载4
5
/*6
微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite7
下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。8
代码如下：9
*/10
11
Response.ContentType = “application/x-zip-compressed“;12
Response.AddHeader(“Content-Disposition“, “attachment;filename=keji.rar“);13
string filename = Server.MapPath(“keji.rar“);14
Response.TransmitFile(filename);15
Response.Write(“<script language=\“javascript\“ type=\“text/javascript\“>“);16
Response.Write(“alert(\“下载成功\“);“);17
Response.Write(“window.location.href=\“C_SC.aspx\“;“);18
Response.Write(“</script>“);19
20
}21
protected void Button2_Click(object sender, EventArgs e)22
{23
24
//WriteFile实现下载25
string fileName = “ceshi.rar“;//客户端保存的文件名26
string filePath = Server.MapPath(“keji.rar“);//路径27
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FileInfo fileInfo = new FileInfo(filePath);29
Response.Clear();30
Response.ClearContent();31
Response.ClearHeaders();32
Response.AddHeader(“Content-Disposition“, “attachment;filename=“ + fileName);33
Response.AddHeader(“Content-Length“, fileInfo.Length.ToString());34
Response.AddHeader(“Content-Transfer-Encoding“, “binary“);35
Response.ContentType = “application/octet-stream“;36
Response.ContentEncoding = System.Text.Encoding.GetEncoding(“gb2312“);37
Response.WriteFile(fileInfo.FullName);38
Response.Flush();39
Response.End();40
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}42
protected void Button3_Click(object sender, EventArgs e)43
{44
//WriteFile分块下载45
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string fileName = “GhostXP.iso“;//客户端保存的文件名47
string filePath = Server.MapPath(“GhostXP7.7.iso“);//路径48
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System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);50
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if (fileInfo.Exists == true)52
{53
const long ChunkSize = 409600;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力54
byte[] buffer = new byte[ChunkSize];55
56
Response.Clear();57
System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);58
long dataLengthToRead = iStream.Length;//获取下载的文件总大小59
Response.ContentType = “application/octet-stream“;60
Response.AddHeader(“Content-Disposition“, “attachment; filename=“ + HttpUtility.UrlEncode(fileName));61
while (dataLengthToRead > 0 && Response.IsClientConnected)62
{63
int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小64
Response.OutputStream.Write(buffer, 0, lengthRead);65
Response.Flush();66
dataLengthToRead = dataLengthToRead – lengthRead;67
}68
Response.Close();69
}70
}71
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//字符流方式下载文件73
protected void Button4_Click(object sender, EventArgs e)74
{75
string fileName = “ce2.rar“;//客户端保存的文件名76
string filePath = Server.MapPath(“keji.rar“);//路径77
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//以字符流的形式下载文件79
FileStream fs = new FileStream(filePath, FileMode.Open);80
byte[] bytes = new byte[(int)fs.Length];81
fs.Read(bytes, 0, bytes.Length);82
fs.Close();83
Response.ContentType = “application/octet-stream“;84
//通知浏览器下载文件而不是打开85
Response.AddHeader(“Content-Disposition“, “attachment; filename=“ + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));86
Response.BinaryWrite(bytes);87
Response.Flush();88
Response.End();89
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