HttpFileCollection Class
TOC
Collapse the table of content
Expand the table of content

HttpFileCollection Class

 

Provides access to and organizes files uploaded by a client.

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


Public NotInheritable Class HttpFileCollection
	Inherits NameObjectCollectionBase

NameDescription
System_CAPS_pubpropertyAllKeys

Gets a string array containing the keys (names) of all members in the file collection.

System_CAPS_pubpropertyCount

Gets the number of key/value pairs contained in the NameObjectCollectionBase instance.(Inherited from NameObjectCollectionBase.)

System_CAPS_pubpropertyItem(Int32)

Gets the object with the specified numerical index from the HttpFileCollection.

System_CAPS_pubpropertyItem(String)

Gets the object with the specified name from the file collection.

System_CAPS_pubpropertyKeys

Gets a NameObjectCollectionBase.KeysCollection instance that contains all the keys in the NameObjectCollectionBase instance.(Inherited from NameObjectCollectionBase.)

NameDescription
System_CAPS_pubmethodCopyTo(Array, Int32)

Copies members of the file collection to an Array beginning at the specified index of the array.

System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_pubmethodGet(Int32)

Returns the HttpPostedFile object with the specified numerical index from the file collection.

System_CAPS_pubmethodGet(String)

Returns the HttpPostedFile object with the specified name from the file collection.

System_CAPS_pubmethodGetEnumerator()

Returns an enumerator that iterates through the NameObjectCollectionBase.(Inherited from NameObjectCollectionBase.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetKey(Int32)

Returns the name of the HttpFileCollection member with the specified numerical index.

System_CAPS_pubmethodGetMultiple(String)

System_CAPS_pubmethodGetObjectData(SerializationInfo, StreamingContext)

Implements the ISerializable interface and returns the data needed to serialize the NameObjectCollectionBase instance.(Inherited from NameObjectCollectionBase.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodOnDeserialization(Object)

Implements the ISerializable interface and raises the deserialization event when the deserialization is complete.(Inherited from NameObjectCollectionBase.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethodICollection.CopyTo(Array, Int32)

Copies the entire NameObjectCollectionBase to a compatible one-dimensional Array, starting at the specified index of the target array.(Inherited from NameObjectCollectionBase.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyICollection.IsSynchronized

Gets a value indicating whether access to the NameObjectCollectionBase object is synchronized (thread safe).(Inherited from NameObjectCollectionBase.)

System_CAPS_pubinterfaceSystem_CAPS_privpropertyICollection.SyncRoot

Gets an object that can be used to synchronize access to the NameObjectCollectionBase object.(Inherited from NameObjectCollectionBase.)

NameDescription
System_CAPS_pubmethodAsParallel()

Overloaded. Enables parallelization of a query.(Defined by ParallelEnumerable.)

System_CAPS_pubmethodAsQueryable()

Overloaded. Converts an IEnumerable to an IQueryable.(Defined by Queryable.)

System_CAPS_pubmethodCast(Of TResult)()

Casts the elements of an IEnumerable to the specified type.(Defined by Enumerable.)

System_CAPS_pubmethodOfType(Of TResult)()

Filters the elements of an IEnumerable based on a specified type.(Defined by Enumerable.)

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="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)

        ' Clear the BulletedList.
        BulletedList1.Items.Clear()

        ' Check to see if at least one file was specified.
        If (FileUpload1.HasFile Or FileUpload2.HasFile) Then

            Label1.Text = "The file collection consists of:"

            ' Get the HttpFileCollection.
            Dim hfc As HttpFileCollection = Request.Files
            For Each h As String In hfc.AllKeys

                ' Add an item to the BulletedList if a file
                ' was specified for the corresponding control.
                If (hfc(h).ContentLength > 0) Then
                    BulletedList1.Items.Add(Server.HtmlEncode(hfc(h).FileName))
                End If
            Next
        Else

            Label1.Text = "You did not specify any files to upload or " & _
                "the file(s) could not be found."

        End If
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" 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>

.NET Framework
Available since 1.1

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

Return to top
Show:
© 2016 Microsoft