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Important properties, events
Enabled: disable the FileUpload control.
FileBytes: get the uploaded file as a byte array.
FileContent: get the uploaded file as a stream.
FileName: get the name of the file uploaded.
HasFile: Returns True when a file has been uploaded.
PostedFile: get the uploaded file wrapped in the HttpPostedFile object.
Focus: set the form focus to the FileUpload control.
SaveAs: save the uploaded file to the file system.
<%@ Page Language="C#" %>
<%@ Import Namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btnAdd_Click(object sender, EventArgs e)
{
if (upImage.HasFile)
{
if (CheckFileType(upImage.FileName))
{
String filePath = "~/UploadImages/" + upImage.FileName;
upImage.SaveAs(MapPath(filePath));
}
}
}
bool CheckFileType(string fileName)
{
string ext = Path.GetExtension(fileName);
switch (ext.ToLower())
{
case ".png":
return true;
case ".jpg":
return true;
default:
return false;
}
}
void Page_PreRender()
{
string upFolder = MapPath("~/UploadImages/");
DirectoryInfo dir = new DirectoryInfo(upFolder);
dlstImages.DataSource = dir.GetFiles();
dlstImages.DataBind();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>FileUpload File</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblImageFile"
Text="Image File:"
AssociatedControlID="upImage"
Runat="server" />
<asp:FileUpload
id="upImage"
Runat="server" />
<br /><br />
<asp:Button
id="btnAdd"
Text="Add Image"
OnClick="btnAdd_Click"
Runat="server" />
<hr />
<asp:DataList
id="dlstImages"
RepeatColumns="3"
runat="server">
<ItemTemplate>
<asp:Image ID="Image1"
ImageUrl='<%# Eval("Name", "~/UploadImages/{0}") %>'
style="width:200px"
Runat="server" />
<br />
<%# Eval("Name") %>
</ItemTemplate>
</asp:DataList>
</div>
</form>
</body>
</html>
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