HtmlInputFile.PostedFile 属性
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
获取对由客户端指定的上载文件的访问。
public:
property System::Web::HttpPostedFile ^ PostedFile { System::Web::HttpPostedFile ^ get(); };public System.Web.HttpPostedFile PostedFile { get; }member this.PostedFile : System.Web.HttpPostedFilePublic ReadOnly Property PostedFile As HttpPostedFile属性值
HttpPostedFile，它访问要上载的文件。
示例
下面的代码示例演示如何使用 PostedFile 属性启动将文件传输到服务器的实用工具。 请注意，如果上传的文件的大小（以字节为单位）超过属性的值 ContentLength ，则不会上传该文件。 若要使此示例正常工作，需要在计算机的驱动器 C 上创建一个调用 Temp 的目录。
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Button1_Click(object Source, EventArgs e)
{
// Make sure a file was submitted.
if (Text1.Value == "")
{
Span1.InnerHtml = "Error: You must enter a file name.";
return;
}
// Save the file.
if (File1.PostedFile.ContentLength > 0)
{
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>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlInputFile Example</title>
</head>
<body>
<h3>HtmlInputFile Example</h3>
<form id="form1" enctype="multipart/form-data"
runat="server">
Select File to Upload:
<input id="File1"
type="file"
runat="server"/>
<p>
Save as file name (no path):
<input id="Text1"
type="text"
runat="server"/>
</p>
<p>
<span id="Span1"
style="font: 8pt verdana;"
runat="server" />
</p>
<p>
<input type="button"
id="Button1"
value="Upload"
onserverclick="Button1_Click"
runat="server" />
</p>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Button1_Click(ByVal Source As Object, ByVal e As EventArgs)
' Make sure a file was submitted.
If Text1.Value = "" Then
Span1.InnerHtml = "Error: You must enter a file name."
Return
End If
' Save the file.
If File1.PostedFile.ContentLength > 0 Then
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 exc As Exception
Span1.InnerHtml = "Error saving file <b>c:\temp\" & _
Text1.Value & "</b><br />" & exc.ToString() + "."
End Try
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlInputFile Example</title>
</head>
<body>
<h3>HtmlInputFile Example</h3>
<form id="form1" enctype="multipart/form-data"
runat="server">
Select File to Upload:
<input id="File1"
type="file"
runat="server"/>
<p>
Save as file name (no path):
<input id="Text1"
type="text"
runat="server"/>
</p>
<p>
<span id="Span1"
style="font: 8pt verdana;"
runat="server" />
</p>
<p>
<input type="button"
id="Button1"
value="Upload"
onserverclick="Button1_Click"
runat="server" />
</p>
</form>
</body>
</html>
注解
浏览器安全限制可防止在多个请求之间维护此值。