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lihao9806 2003-08-01
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你要设置一下Accept属性为“image/*”就可以了。
给你个例子：
<%@ Page Language="C#" AutoEventWireup="True" %>
<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 <b>c:\\temp\\" +
Text1.Value + "</b> on the Web server";
}
catch (Exception exc)
{
Span1.InnerHtml = "Error saving file <b>c:\\temp\\" +
Text1.Value + "</b><br>" + exc.ToString();
}
}
}
</script>
</head>
<body>
<h3>HtmlInputFile Sample</h3>
<form enctype="multipart/form-data" runat="server">
Select File to Upload:
<input id="File1"
type="file"
accept="image/*"
runat="server"/>
<p>
Save as filename (no path):
<input id="Text1"
type="text"
runat="server"/>
<p>
<span id=Span1
style="font: 8pt verdana;"
runat="server" />
<p>
<input type=button
id="Button1"
value="Upload"
OnServerClick="Button1_Click"
runat="server">
</form>
</body>
</html>
给你个例子：
<%@ Page Language="C#" AutoEventWireup="True" %>
<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 <b>c:\\temp\\" +
Text1.Value + "</b> on the Web server";
}
catch (Exception exc)
{
Span1.InnerHtml = "Error saving file <b>c:\\temp\\" +
Text1.Value + "</b><br>" + exc.ToString();
}
}
}
</script>
</head>
<body>
<h3>HtmlInputFile Sample</h3>
<form enctype="multipart/form-data" runat="server">
Select File to Upload:
<input id="File1"
type="file"
accept="image/*"
runat="server"/>
<p>
Save as filename (no path):
<input id="Text1"
type="text"
runat="server"/>
<p>
<span id=Span1
style="font: 8pt verdana;"
runat="server" />
<p>
<input type=button
id="Button1"
value="Upload"
OnServerClick="Button1_Click"
runat="server">
</form>
</body>
</html>
xiajianfeng 2003-08-01
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using System.IO;//need use System.IO namespace
xiajianfeng 2003-08-01
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public bool isImage(string strFileName)
{
if(strFileName!="")
{
strFileName = (System.IO.Path.GetFileName(strFileName)).ToLower();
//define allow image type string[] strExt = new string[5];
strExt[0] = ".gif";
strExt[1] = ".jpg";
strExt[2] = ".jpeg";
strExt[3] = ".jpe";
strExt[4] = ".bmp";
//get extend file name
string strExtensions = Path.GetExtension(strFileName);
//Judge image type if (Array.IndexOf(strExt, strExtensions) == -1 && strFileName!="")
return false;
else
return true;
}
else
{
return true;
}
}
{
if(strFileName!="")
{
strFileName = (System.IO.Path.GetFileName(strFileName)).ToLower();
//define allow image type string[] strExt = new string[5];
strExt[0] = ".gif";
strExt[1] = ".jpg";
strExt[2] = ".jpeg";
strExt[3] = ".jpe";
strExt[4] = ".bmp";
//get extend file name
string strExtensions = Path.GetExtension(strFileName);
//Judge image type if (Array.IndexOf(strExt, strExtensions) == -1 && strFileName!="")
return false;
else
return true;
}
else
{
return true;
}
}
sndy77 2003-08-01
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我是想这样，当上传文件时，点击HTMLINPUTFILE控件的浏览按扭时，弹出对话框时只出现图片格式的扩展名。
kyo1209 2003-08-01
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在前台和后台分别判断文件扩展名,会安全一些，例如用right("xxxxx",4)是否等于.jpg。
sndy77 2003-08-01
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老大，给段代码
cyp503 2003-08-01
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判断文件的扩展名,gif,jpg,png,bmp……
sndy77 2003-08-01
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要在弹出的对话西框中实现,不要提交以后在判断。
