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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;
      }
   }

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

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