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HttpFileCollection Class

Provides access to and organizes files uploaded by a client.

Namespace: System.Web
Assembly: System.Web (in system.web.dll)

public sealed class HttpFileCollection : NameObjectCollectionBase
public final class HttpFileCollection extends NameObjectCollectionBase
public final class HttpFileCollection extends NameObjectCollectionBase
Not applicable.

Clients encode files and transmit them in the content body using multipart MIME format with an HTTP Content-Type header of multipart/form-data. ASP.NET extracts the encoded file(s) from the content body into individual members of an HttpFileCollection. Methods and properties of the HttpPostedFile class provide access to the contents and properties of each file.

The following example demonstrates how to access the HttpFileCollection collection returned from the Files property of the HttpRequest object. The HttpFileCollection collection is populated by two FileUpload controls on the Web page. Items in the file collection are displayed in a BulletedList control.

<%@ Page Language="C#" %>

<!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 Button1_Click(object sender, EventArgs e)
    {
        // Clear the BulletedList.
        BulletedList1.Items.Clear();
        
        // Check to see if at least one file was specified.
        if (FileUpload1.HasFile | FileUpload2.HasFile)
        {
            Label1.Text = "The file collection consists of:";
            
            // Get the HttpFileCollection.
            HttpFileCollection hfc = Request.Files;
            foreach (String h in hfc.AllKeys)
            {
                // Add an item to the BulletedList if a file
                // was specified for the corresponding control.
                if (hfc[h].ContentLength > 0)
                    BulletedList1.Items.Add(Server.HtmlEncode(hfc[h].FileName));
            }
            
        }
        else
        {
            Label1.Text = "You did not specify any files to upload or " +
                "the file(s) could not be found.";
        }

    }        
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>HttpFileCollection Example</title>
</head>
<body>
    <form id="form1" 
          runat="server">
    <div>
        <asp:FileUpload ID="FileUpload1" 
                        runat="server" />
        <br />
        <asp:FileUpload ID="FileUpload2" 
                        runat="server" />
        <br />
        <asp:Button ID="Button1" 
                    runat="server" 
                    OnClick="Button1_Click" 
                    Text="Upload" />
        <br />
        <asp:Label ID="Label1" 
                   runat="server"/>
        <br />
        <asp:BulletedList ID="BulletedList1" 
                          runat="server">
        </asp:BulletedList>
        </div>
    </form>
</body>
</html>

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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