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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 Versions and Dependencies.

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

Response.Cache.SetETagFromFileDependencies();
 

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

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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