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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)

'Declaration
Public MustOverride Function Intersect ( _
	target As IPermission _
) As IPermission

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 Nothing if the intersection is empty.

Implements

IPermission.Intersect(IPermission)

ExceptionCondition
ArgumentException

The target parameter is not Nothing 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 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

.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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