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HttpApplication.GetVaryByCustomString Method

Provides an application-wide implementation of the VaryByCustom property.

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

public virtual string GetVaryByCustomString(
	HttpContext context,
	string custom


Type: System.Web.HttpContext
An HttpContext object that contains information about the current Web request.
Type: System.String
The custom string that specifies which cached response is used to respond to the current request.

Return Value

Type: System.String
If the value of the custom parameter is "browser", the browser's Type; otherwise, null.

You can override GetVaryByCustomString to add a new method for calculating custom vary-by values that are based on the current request. The implementation has to call the base class for custom values that it does not recognize. For more information, see How to: Cache Versions of a Page Using Custom Strings.

.NET Framework

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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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