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HttpCachePolicy::SetETagFromFileDependencies Method

Sets the ETag HTTP header based on the time stamps of the handler's file dependencies.

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

public:
void SetETagFromFileDependencies()

ExceptionCondition
InvalidOperationException

The ETag header has already been set.

The SetETagFromFileDependencies method sets the ETag header by retrieving the last modified time stamps of all files on which the handler is dependent, combining all file names and time stamps into a single string, then hashing that string into a single digest that is used as the ETag.

SetETagFromFileDependencies is introduced in the .NET Framework version 3.5. For more information, see .NET Framework 3.5 Architecture.

The following code example demonstrates how to set the ETag header.

No code example is currently available or this language may not be supported.

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

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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