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HttpCachePolicy.SetVaryByCustom Method

.NET Framework 4.5

Specifies a custom text string to vary cached output responses by.

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

public void SetVaryByCustom(
	string custom
)

Parameters

custom: Type: System.String
The text string to vary cached output by.

Exceptions

Exception	Condition
ArgumentNullException	custom is null.
InvalidOperationException	The SetVaryByCustom method has already been called.

Remarks

SetVaryByCustom is introduced in the .NET Framework version 3.5. For more information, see .NET Framework Versions and Dependencies.

Topic	Location
How to: Cache Versions of a Page Using Custom Strings	Building ASP .NET Web Applications
How to: Cache Versions of a Page Using Custom Strings	Building ASP .NET Web Applications

Examples

The following code example demonstrates how to set the custom vary string to "Accept-Charset", which causes the origin-server's cache to choose one of several cached responses depending on the browser's Accept-Charset header.

Response.Cache.SetVaryByCustom("Accept-Charset");

Version Information

.NET Framework

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

Platforms

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.

Reference

HttpCachePolicy Class

System.Web Namespace

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