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Control.OpenFile Method

Gets a Stream used to read a file.

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

protected internal Stream OpenFile(
	string path
)

Parameters

path
Type: System.String

The path to the desired file.

Return Value

Type: System.IO.Stream
A Stream that references the desired file.

ExceptionCondition
HttpException

Access to the specified file was denied.

The OpenFile method returns a Stream object that can be used to read the contents of the file specified in the path parameter. The path parameter can be either a relative or root URL without a protocol (such as "~/mySite/myFile.txt), or a physical path, either local ("c:\mySite\myFile.txt") or UNC ("\\myServer\myFile.txt").

The OpenFile method uses file access security to control access to the specified file. If the current ASP.NET user does not have access to the file, then the file is not opened and an HttpException exception is thrown to indicate that access was denied. If the path parameter specified a relative path, the exception does not include information about the physical path to the requested file.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

Windows 8.1, Windows Server 2012 R2, 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.

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