急！ASP.NET实现文件上传的问题！

richardxulf 2003-10-22 04:47:34

我照着MSDN提供的ASP.NET实现文件上传的例子做了一个文件上传的Web.
代码基本上和例子一样：
<script language="C#" runat="server">

void Button1_Click(object Source, EventArgs e)
{

if (Text1.Value == "")
{
return;
}

if (File1.PostedFile != null)
{
try
{
File1.PostedFile.SaveAs("c:\\temp\\"+Text1.Value);
}
catch (Exception exc)
{
}
}
}

</script>
可是每次File1.PostedFile属性都是null，我怎么试也不行，求高手指点迷津！

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zjcxc 2003-10-29

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'==================================================================--
'
' 用ASP实现无组件上传/下载文件
'
' 功能简介
' 将上传的文件数据保存到数据库中,可以处理表单中的多个上传文件的情况
' 适用于各种数据库,使用ADO的方法连接数据库
' 本示例中使用的是ACCESS数据库:zj.mdb
' 表:tb_img(id int(自增列),path text(255) 保存上传文件的目录
' ,fname text(250) 保存上传的文件名,img ole对象保存上传的文件内容
'
' 邹建 2003.10
'==================================================================

'==================================================================
'
' 上传文件的HTML页: zj_up.htm
'
'==================================================================
<html>
<head>
<title>文件上传保存到数据库中</title>
</head>
<body>
<form name="form1" enctype="multipart/form-data" method="post" action="zj_up.asp">
<p>
<input type="file" name="file">
<input type="submit" name="Submit" value="上传">
</p>
</form>
</body>
</html>

'==================================================================
'
' 上传文件保存到数据库的ASP页: zj_up.asp
'
'==================================================================
<%
Response.Expires=0
Function f_Bin2Str(ByVal sBin)
Dim iI, iLen, iChr, iRe
iRe = ""
If Not IsNull(sBin) Then
iLen = LenB(sBin)
For iI = 1 To iLen
iChr = MidB(sBin, iI, 1)
If AscB(iChr) > 127 Then
iRe = iRe & Chr(AscW(MidB(sBin, iI + 1, 1) & iChr))
iI = iI + 1
Else
iRe = iRe & Chr(AscB(iChr))
End If
Next
End If
f_Bin2Str = iRe
End Function
iConcStr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _
";Data Source=" & server.mappath("zj.mdb")
iSql="tb_img"
set iRe=Server.CreateObject("ADODB.Recordset")
iRe.Open iSql,iConcStr,1,3
iLen=Request.TotalBytes
sBin=Request.BinaryRead(iLen)
iCrlf1 = ChrB(13) & ChrB(10)
iCrlf2 = iCrlf1 & iCrlf1
iLen = InStrB(1, sBin, iCrlf1) - 1
iSpc = LeftB(sBin, iLen)
sBin = MidB(sBin, iLen + 34)
iPos1 = InStrB(sBin, iCrlf2) - 1
While iPos1 > 0
iStr = f_Bin2Str(LeftB(sBin, iPos1))
iPos1 = iPos1 + 5
iPos2 = InStrB(iPos1, sBin, iSpc)

iPos3 = InStr(iStr, "; filename=""") + 12
If iPos3 > 12 Then
iStr = Mid(iStr, iPos3)
iPos3 = InStr(iStr, Chr(13) & Chr(10) & "Content-Type: ") - 2
iFn = Left(iStr, iPos3)
If iFn <> "" Then
iRe.AddNew
ire("path")=left(iFn,instrrev(iFn,"\"))
iRe("fname") = mid(iFn,instrrev(iFn,"\")+1)
iRe("type") = Mid(iStr, iPos3 + 18)
iRe("img").AppendChunk MidB(sBin, iPos1, iPos2 - iPos1)
iRe.Update
End If
End If

sBin = MidB(sBin, iPos2 + iLen + 34)
iPos1 = InStrB(sBin, iCrlf2) - 1
Wend
iRe.close
set iRe=Nothing
%>

'==================================================================
'
' 下载数据的ASP页: zj_down.asp
'
'==================================================================
<%
Response.Buffer=true
Response.Clear

iConcStr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _
";Data Source=" & server.mappath("zj.mdb")
set iRe=server.createobject("adodb.recordset")
iSql="tb_img"
iRe.open iSql,iconcstr,1,1
Response.ContentType=ire("type")
Response.BinaryWrite iRe("img")

iRe.close
set iRe=Nothing
%>

tigerwen01 2003-10-22

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使用以下代码：

< html>
< head>

< script language="C#" runat="server">

void Button1_Click(object Source, EventArgs e) {

if (Text1.Value == "") {
Span1.InnerHtml = "Error: you must enter a file name";
return;
}

if (File1.PostedFile != null) {
try {
File1.PostedFile.SaveAs("c:\\temp\\"+Text1.Value);
Span1.InnerHtml = "File uploaded successfully to c:\\temp\\"+Text1.Value+" on the web server";
}
catch (Exception exc) {
Span1.InnerHtml = "Error saving file c:\\temp\\"+Text1.Value+"
"+ exc.ToString();
}
}
}

< /head>
< body>

HtmlInputFile Sample

< form enctype="multipart/form-data" runat="server">

Select File to Upload:
<input id=File1 type=file runat="server" name="file">
Save as filename (no path): < input id="Text1" type="text" runat="server">
< span id=Span1 style="font: 8pt verdana;" runat="server" />
< input type=button id="Button1" value="Upload" OnServerClick="Button1_Click" runat="server">

< /form>

< /body>
< /html>