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CodeAccessPermission::Union Method

When overridden in a derived class, creates a permission that is the union of the current permission and the specified permission.

Namespace:  System.Security
Assembly:  mscorlib (in mscorlib.dll)

public:
virtual IPermission^ Union(
	IPermission^ other
)

Parameters

other
Type: System.Security::IPermission
A permission to combine with the current permission. It must be of the same type as the current permission.

Return Value

Type: System.Security::IPermission
A new permission that represents the union of the current permission and the specified permission.

Implements

IPermission::Union(IPermission)

ExceptionCondition
NotSupportedException

The other parameter is not nullptr. This method is only supported at this level when passed nullptr.

The result of a call to Union is a permission that represents all the operations represented by both the current permission and the specified permission. Any demand that passes either permission passes their union.

Notes to Inheritors

You must override this method in a derived class. You should return a copy of the permission if the value of the other parameter is nullptr.

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


public:
   virtual IPermission^ Union( IPermission^ target ) override
   {
#if ( debug ) 
      Console::WriteLine( "************* Entering Union *********************" );
#endif 

      if ( target == nullptr )
      {
         return this;
      }

#if ( debug ) 
      Console::WriteLine( "This is = {0}", ((NameIdPermission)this).Name );
      Console::WriteLine( "Target is {0}", ((NameIdPermission)target).m_Name );
#endif 

      if (  !VerifyType( target ) )
      {
         throw gcnew ArgumentException( String::Format( "Argument_WrongType", this->GetType()->FullName ) );
      }

      NameIdPermission^ operand = dynamic_cast<NameIdPermission^>(target);

      if ( operand->IsSubsetOf( this ) )
      {
         return this->Copy();
      }
      else if ( this->IsSubsetOf( operand ) )
      {
         return operand->Copy();
      }
      else
      {
         return nullptr;
      }
   }


.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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