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SignedCms Constructor

The SignedCms() constructor creates an instance of the SignedCms class.

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

public SignedCms()


A null reference was passed to a method that does not accept it as a valid argument.

The SignedCms class has the following default property values.


Default value


1.2.840.113549.1.7.1 (data)Length: zero


Detached state: false The content that is signed is included in the CMS/PKCS #7 message along with the signature information.

The default SubjectIdentifierType for signers is SubjectIdentifierType.IssuerAndSerialNumber.

If the detached state is false (the default), the signed content is included in the CMS/PKCS #7 message along with the signature information. If the detached state is true, clients that cannot decode S/MIME messages can still see the content of the message if it is sent separately. This may be useful in an archiving application that archives message content whether the message sender can be verified for authenticity.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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