CodeAccessPermission.FromXml(SecurityElement) Method

Definition

Namespace:

System.Security

Assembly:

System.Security.Permissions.dll

Source:

CodeAccessPermission.cs

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

public:
 abstract void FromXml(System::Security::SecurityElement ^ elem);

public abstract void FromXml (System.Security.SecurityElement elem);

abstract member FromXml : System.Security.SecurityElement -> unit

Public MustOverride Sub FromXml (elem As SecurityElement)

Parameters

elem

SecurityElement

The XML encoding to use to reconstruct the security object.

Implements

FromXml(SecurityElement)

Exceptions

ArgumentNullException

The elem parameter is null.

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.

Examples

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:
   virtual void FromXml( SecurityElement^ e ) override
   {
      // 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.
      String^ elUnrestricted = e->Attribute("Unrestricted");
      if ( nullptr != elUnrestricted )
      {
         m_Unrestricted = Boolean::Parse( elUnrestricted );
         return;
      }

      String^ elName = e->Attribute("Name");
      m_Name = elName == nullptr ? nullptr : elName;
   }

public override void FromXml(SecurityElement e)
 {
     // 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.
     String elUnrestricted = e.Attribute("Unrestricted");
     if (null != elUnrestricted)
     {
         m_Unrestricted = bool.Parse(elUnrestricted);
         return;
     }

     String elName = e.Attribute( "Name" );
     m_Name = elName == null ? null : elName;
 }

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

Remarks

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

Notes to Implementers

You must override this method in a derived class.