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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
'Usage
Dim instance As CodeAccessPermission 
Dim target As IPermission 
Dim returnValue As IPermission 

returnValue = instance.Intersect(target)

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

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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