This documentation is archived and is not being maintained.

Transform Class

Represents the abstract base class from which all <Transform> elements that can be used in an XML digital signature derive.

Namespace:  System.Security.Cryptography.Xml
Assembly:  System.Security (in System.Security.dll)

public ref class Transform abstract

When performing XML signing and verification, the <Transform> element describes how the signer transformed the data object that was signed. The verifier of a document then uses the <Transform> element to transform the signed data in the same manner. If the verifier cannot transform the signed data in the same manner, the document cannot be verified.

Use a class that derives from the Transform class whenever you need to add one or more transform objects to an encrypted XML document or to a signed XML document.

For more information about the <Transform> element, see the XMLDSIG specification, which is available from the World Wide Web Consortium (W3C) at, or the XML encryption specification, which is available from the W3C at

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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