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CodeAccessPermission.FromXml Method

When overridden in a derived class, reconstructs a security object with a specified state from an XML encoding.

Namespace:  System.Security
Assembly:  mscorlib (in mscorlib.dll)
'Declaration
Public MustOverride Sub FromXml ( _
	elem As SecurityElement _
)

Parameters

elem
Type: System.Security.SecurityElement

The XML encoding to use to reconstruct the security object.

Implements

ISecurityEncodable.FromXml(SecurityElement)
ExceptionCondition
ArgumentNullException

The elem parameter is Nothing.

ArgumentException

The elem parameter does not contain the XML encoding for an instance of the same type as the current instance.

-or-

The version number of the elem parameter is not supported.

Custom code that extends security objects needs to implement the ToXml and FromXml methods to make the objects security-encodable.

Notes to Inheritors

You must override this method in a derived class.

The following code example shows an override of the FromXml method. This code example is part of a larger example provided for the CodeAccessPermission class.

Public Overrides Sub FromXml(ByVal e As SecurityElement)
            ' The following code for unrestricted permission is only included as an example for 
            ' permissions that allow the unrestricted state. It is of no value for this permission. 
            Dim elUnrestricted As String = e.Attribute("Unrestricted")
            If Nothing <> elUnrestricted Then
                m_Unrestricted = Boolean.Parse(elUnrestricted)
                Return 
            End If 

            Dim elName As String = e.Attribute("Name")
            m_name = IIf(elName Is Nothing, Nothing, elName)
        End Sub 'FromXml

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, 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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