HttpFileCollection Class
Provides access to and organizes files uploaded by a client.
Namespace: System.Web
Assembly: System.Web (in System.Web.dll)
The HttpFileCollection type exposes the following members.
| Name | Description | |
|---|---|---|
 | AllKeys | Gets a string array containing the keys (names) of all members in the file collection. |
| Count | Gets the number of key/value pairs contained in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.) |
| Item[Int32] | Gets the object with the specified numerical index from the HttpFileCollection. |
| Item[String] | Gets the object with the specified name from the file collection. |
| Keys | Gets a NameObjectCollectionBase.KeysCollection instance that contains all the keys in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.) |
| Name | Description | |
|---|---|---|
| CopyTo | Copies members of the file collection to an Array beginning at the specified index of the array. |
| Equals(Object) | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
| Get(Int32) | Returns the HttpPostedFile object with the specified numerical index from the file collection. |
| Get(String) | Returns the HttpPostedFile object with the specified name from the file collection. |
| GetEnumerator | Returns an enumerator that iterates through the NameObjectCollectionBase. (Inherited from NameObjectCollectionBase.) |
| GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
| GetKey | Returns the name of the HttpFileCollection member with the specified numerical index. |
| GetMultiple | Returns all files that match the specified name. |
| GetObjectData | Implements the ISerializable interface and returns the data needed to serialize the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| OnDeserialization | Implements the ISerializable interface and raises the deserialization event when the deserialization is complete. (Inherited from NameObjectCollectionBase.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
| Name | Description | |
|---|---|---|
| ICollection.CopyTo | Copies the entire NameObjectCollectionBase to a compatible one-dimensional Array, starting at the specified index of the target array. (Inherited from NameObjectCollectionBase.) |
 | ICollection.IsSynchronized | Gets a value indicating whether access to the NameObjectCollectionBase object is synchronized (thread safe). (Inherited from NameObjectCollectionBase.) |
| ICollection.SyncRoot | Gets an object that can be used to synchronize access to the NameObjectCollectionBase object. (Inherited from NameObjectCollectionBase.) |
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>
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
