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HttpCacheVaryByHeaders::Item Property

Gets or sets a custom header field that the ASP.NET output cache varies the cached responses by, and appends it to the out-going Vary HTTP header.

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

public:
property bool Item[String^ header] {
	bool get (String^ header);
	void set (String^ header, bool value);
}

Parameters

header
Type: System::String

The name of the custom header.

Property Value

Type: System::Boolean
true when the ASP.NET output cache varies by the specified custom field; otherwise, false. The default value is false.

ExceptionCondition
ArgumentNullException

header is nullptr.

The Vary header indicates the request-header fields that the server varies the response by.

For more information, see RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1, available on the World Wide Web Consortium (W3C) Web site. See section 14, "Header Field Definitions", for complete details.

The VaryByUnspecifiedParameters method is called internally if the specified header has the value * (an asterisk).

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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