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CodeAccessPermission::Intersect Method

When implemented by a derived class, creates and returns a permission that is the intersection of the current permission and the specified permission.

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

public:
virtual IPermission^ Intersect(
	IPermission^ target
) abstract

Parameters

target
Type: System.Security::IPermission

A permission to intersect 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 intersection of the current permission and the specified permission. This new permission is nullptr if the intersection is empty.

Implements

IPermission::Intersect(IPermission)

ExceptionCondition
ArgumentException

The target parameter is not nullptr and is not an instance of the same class as the current permission.

The intersection of two permissions is a permission that describes the set of operations they both describe in common. Only a demand that passes both original permissions will pass the intersection.

Notes to Inheritors

You must override this method in a derived class.

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

public:
   virtual IPermission^ Intersect( IPermission^ target ) override
   {
      Console::WriteLine( "************* Entering Intersect *********************" );
      if ( target == nullptr )
      {
         return nullptr;
      }

#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 is wrong type.", this->GetType()->FullName ) );
      }

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

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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