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//TransmitFile實現下載
protected
void
Button1_Click(
object
sender, EventArgs e)
{
/*
微軟爲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的文件時致使Aspnet_wp.exe進程回收而沒法成功下載的問題。
代碼以下：
*/
Response.ContentType =
"application/x-zip-compressed"
;
string
FileName =
"test.doc"
;
//使用UTF-8對文件名進行編碼
Response.AppendHeader(
"Content-Disposition"
,
"attachment;filename=\""
+ HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) +
"\""
);
Response.ContentType =
"application/octet-stream"
;
Response.AddHeader(
"Content-Disposition"
,
"attachment;filename="
+ FileName);
string
filename = Server.MapPath(
"../ReportTemplate/test.doc"
);
Response.TransmitFile(filename);
}
//WriteFile實現下載
protected
void
Button2_Click(
object
sender, EventArgs e)
{
/*
using System.IO;
*/
string
fileName =
"test.doc"
;
//客戶端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//路徑
FileInfo fileInfo =
new
FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader(
"Content-Disposition"
,
"attachment;filename=\""
+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) +
"\""
);
Response.AddHeader(
"Content-Length"
, fileInfo.Length.ToString());
Response.AddHeader(
"Content-Transfer-Encoding"
,
"binary"
);
Response.ContentType =
"application/octet-stream"
;
Response.WriteFile(fileInfo.FullName);
Response.Flush();
Response.End();
}
//WriteFile分塊下載
protected
void
Button3_Click(
object
sender, EventArgs e)
{
string
fileName =
"test.doc"
;
//客戶端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//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，這樣能夠緩解服務器的壓力
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, System.Text.Encoding.UTF8));
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 =
"test.doc"
;
//客戶端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//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();
}
}
|
注意：若是直接在aspx.cs上寫以上的代碼，response必定要手動關閉，不然就會把整個頁面的HTML代碼都給下載了。瀏覽器
還有一種方式就是把上面的代碼放入一個通常處理程序中這樣就能夠很好的避免下載整個頁面的HTML代碼服務器
代碼以下session
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using
System.Web;
using
ECS.Biz.Common.Common;
using
ECS.Biz.DEPG1210Ds.ServiceModel;
namespace
ECS.Web.Handle
{
/// <summary>
/// DownLoad の概要の説明
/// </summary>
public
class
DownLoadHttpHandler : IHttpHandler, System.Web.SessionState.IRequiresSessionState
{
public
void
ProcessRequest(HttpContext context)
{
context.Response.ContentType =
"text/plain"
;
//由於用到了session傳值，因此DownLoadHttpHandler : IHttpHandler, System.Web.SessionState.IRequiresSessionState
DEPG1210DsSvm l_svmDEPG1210Ds = (DEPG1210DsSvm)context.Session[ConstData.Session.DEPG1210_DEPG1210DsSvm];
string
l_strFileName = l_svmDEPG1210Ds.DEPG1210DsCtx.ConferenceInfoTbl.Entities[0].JournalsFileName;
byte
[] l_bytFileData = l_svmDEPG1210Ds.DEPG1210DsCtx.ConferenceInfoTbl.Entities[0].JournalsContent;
//HttpContext.Current.Response.Clear();
l_strFileName = System.Web.HttpUtility.UrlEncode(l_strFileName);
HttpContext.Current.Response.AppendHeader(
"Content-Disposition"
,
"attachment;filename="
+ l_strFileName);
if
(l_bytFileData.Length == 0)
{
l_bytFileData = System.Text.Encoding.Unicode.GetBytes(
" "
);
}
HttpContext.Current.Response.BinaryWrite(l_bytFileData);
//HttpContext.Current.Response.Flush();
//HttpContext.Current.Response.End();
}
public
bool
IsReusable
{
get
{
return
false
;
}
}
}
}
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這個的傳值我用的是Session來傳值的因此畫面調用的話就會很簡單了app
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<asp:LinkButton ID=
"lbtnAttachFiles"
runat=
"server"
href=
"../Handle/DownLoadHttpHandler.ashx"
Width=
"160px"
CssClass=
"ShortNameShow"
></asp:LinkButton>
|