Initializes a new instance of the HtmlInputFile class.
Assembly: System.Web (in System.Web.dll)
Remarks
Use this constructor to create and initialize a new instance of the HtmlInputFile class.
The following table shows the initial property value for an instance of HtmlInputFile.
Property | Initial Value |
|---|---|
The "file" literal string. |
Examples
The following code example demonstrates how to create a new instance of the HtmlInputFile class. For this example to work properly, you need to create a directory called Temp on your computer's drive C.
<%@ 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 sender As Object, ByVal e As EventArgs)
' Get HtmlInputFile control from the Controls collection
' of the PlaceHolder control.
Dim file As HtmlInputFile = _
CType(Place.FindControl("File1"), HtmlInputFile)
' 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 file.PostedFile.ContentLength > 0 Then
Try
file.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
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Create a new HtmlInputFile control.
Dim file As HtmlInputFile = New HtmlInputFile()
file.ID = "File1"
' Add the control to the Controls collection of the
' PlaceHolder control.
Place.Controls.Clear()
Place.Controls.Add(file)
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlInputFile Constructor Example</title>
</head>
<body>
<h3>HtmlInputFile Constructor Example</h3>
<form id="form1" enctype="multipart/form-data"
runat="server">
Specify the file to upload:
<asp:PlaceHolder id="Place"
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="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 sender, EventArgs e)
{
// Get the HtmlInputFile control from the Controls collection
// of the PlaceHolder control.
HtmlInputFile file = (HtmlInputFile)Place.FindControl("File1");
// Make sure a file was submitted.
if (Text1.Value == "")
{
Span1.InnerHtml = "Error: You must enter a file name.";
return;
}
// Save the file.
if (file.PostedFile.ContentLength > 0)
{
try
{
file.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() + ".";
}
}
}
void Page_Load(object sender, EventArgs e)
{
// Create a new HtmlInputFile control.
HtmlInputFile file = new HtmlInputFile();
file.ID = "File1";
// Add the control to the Controls collection of the
// PlaceHolder control.
Place.Controls.Clear();
Place.Controls.Add(file);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlInputFile Constructor Example</title>
</head>
<body>
<h3>HtmlInputFile Constructor Example</h3>
<form id="form1" enctype="multipart/form-data"
runat="server">
Specify the file to upload:
<asp:PlaceHolder id="Place"
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>
Platforms
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.