Provides access to individual files that have been uploaded by a client.
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class HttpPostedFile
Dim instance As HttpPostedFile
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)] public sealed class HttpPostedFile
[AspNetHostingPermissionAttribute(SecurityAction::LinkDemand, Level = AspNetHostingPermissionLevel::Minimal)] public ref class HttpPostedFile sealed
public final class HttpPostedFile
The HttpFileCollection class provides access to all the files that are uploaded from a client as a file collection. The HttpPostedFile class provides properties and methods to get information about an individual file and to read and save the file.
The HtmlInputFile control can be used to select and upload files from a client.
Files are uploaded in MIME multipart/form-data format. By default, all requests, including form fields and uploaded files, larger than 256 KB are buffered to disk, rather than held in server memory.
You can specify the maximum allowable request size by accessing the MaxRequestLength property or by setting the maxRequestLength attribute of the httpRuntime Element (ASP.NET Settings Schema) element within the Machine.config or Web.config file. The default is 4 MB.
The amount of data that is buffered in server memory for a request, which includes file uploads, can be specified by accessing the RequestLengthDiskThreshold property or by setting the requestLengthDiskThreshold attribute of the httpRuntime Element (ASP.NET Settings Schema) element within the Machine.config or Web.config file.
By adjusting the MaxRequestLength and RequestLengthDiskThreshold properties, you can fine tune the performance of your server. Additionally, you should consider setting the MaxRequestLength to prevent denial of service attacks caused by users posting large files to the server.
Server resources that are allocated to buffer the uploaded file will be destroyed when the request ends. To save a durable copy of the file, use the SaveAs method.
for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98