IPermission.Intersect Method (IPermission)
Creates and returns a permission that is the intersection of the current permission and the specified permission.
Assembly: mscorlib (in mscorlib.dll)
A permission to intersect with the current permission. It must be of the same type as the current permission.
Return ValueType: System.Security.IPermission
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.
The target parameter is not null 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.
The following statements are required to be true for all implementations of the IPermission object references that are not null.method. X and Y represent
X.Intersect(X) returns a value equal to X.
X.Intersect(Y) returns the same value as Y.Intersect(X).
X.Intersect(null) returns null.
The following code example demonstrates implementing the IPermission class.method. This code example is part of a larger example provided for the
' Return a new object that contains the intersection of 'this' and 'target'. Public Overrides Function Intersect(ByVal target As IPermission) As IPermission ' If 'target' is null, return null. If target Is Nothing Then Return Nothing End If ' Both objects must be the same type. Dim soundPerm As SoundPermission = VerifyTypeMatch(target) ' If 'this' and 'target' are unrestricted, return a new unrestricted permission. If m_specifiedAsUnrestricted AndAlso soundPerm.m_specifiedAsUnrestricted Then Return Clone(True, SoundPermissionState.PlayAnySound) End If ' Calculate the intersected permissions. If there are none, return null. Dim val As SoundPermissionState = CType(Math.Min(CType(m_flags, Int32), CType(soundPerm.m_flags, Int32)), SoundPermissionState) If val = 0 Then Return Nothing End If ' Return a new object with the intersected permission value. Return Clone(False, val) End Function 'Intersect
Available since 1.1