CodeAccessPermission.Intersect(IPermission) Method
Definition
Important
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When implemented by a derived class, creates and returns a permission that is the intersection of the current permission and the specified permission.
public:
abstract System::Security::IPermission ^ Intersect(System::Security::IPermission ^ target);public abstract System.Security.IPermission Intersect (System.Security.IPermission target);abstract member Intersect : System.Security.IPermission -> System.Security.IPermissionPublic MustOverride Function Intersect (target As IPermission) As IPermissionParameters
- target
- IPermission
A permission to intersect with the current permission. It must be of the same type as the current permission.
Returns
A new permission that represents the intersection of the current permission and the specified permission. This new permission is null if the intersection is empty.
Implements
Exceptions
The target parameter is not null and is not an instance of the same class as the current permission.
Examples
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;
}
}
public override IPermission Intersect(IPermission target)
{
Console.WriteLine ("************* Entering Intersect *********************");
if (target == null)
{
return null;
}
#if(debug)
Console.WriteLine ("This is = " + (( NameIdPermission)this).Name);
Console.WriteLine ("Target is " + (( NameIdPermission)target).m_Name);
#endif
if (!VerifyType(target))
{
throw new ArgumentException (String.Format ("Argument is wrong type.", this.GetType ().FullName));
}
NameIdPermission operand = ( NameIdPermission)target;
if (operand.IsSubsetOf (this)) return operand.Copy ();
else if (this.IsSubsetOf (operand)) return this.Copy ();
else
return null;
}
Public Overrides Function Intersect(ByVal target As IPermission) As IPermission
Console.WriteLine("************* Entering Intersect *********************")
If target Is Nothing Then
Return Nothing
End If
#If (Debug) Then
Console.WriteLine(("This is = " + CType(Me, NameIdPermission).Name))
Console.WriteLine(("Target is " + CType(target, NameIdPermission).m_name))
#End If
If Not VerifyType(target) Then
Throw New ArgumentException(String.Format("Argument is wrong type.", Me.GetType().FullName))
End If
Dim operand As NameIdPermission = CType(target, NameIdPermission)
If operand.IsSubsetOf(Me) Then
Return operand.Copy()
ElseIf Me.IsSubsetOf(operand) Then
Return Me.Copy()
Else
Return Nothing
End If
End Function 'Intersect
Remarks
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 Implementers
You must override this method in a derived class.
