Creates and returns a permission that is the intersection of the current permission and the specified permission.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Overrides Function Intersect ( _ target As IPermission _ ) As IPermission
- Type: System.Security.IPermission
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, or Nothing if the intersection is empty.
The target parameter is not Nothing and is not of the same type 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 intersection of two identical strong name identity permissions is the same permission. The intersection of two different (not wildcard) expressions is an empty permission. The intersection of a wildcard expression and a matching strong name is the strong name. The intersection of two wildcard expressions that match is the longer, more specific of the two expressions.
The following code example shows the results of the use of the method, not how to use the method. This example is part of a larger example provided for the StrongNameIdentityPermission class. The best use for this example is to build and execute the entire example, and view its output.
The code example is intended to show the behavior of the method, not to demonstrate its use. In general, the methods of permission classes are used by the security infrastructure; they are not typically used in applications.
' Intersect creates and returns a new permission that is the intersection of the current ' permission and the permission specified. Private Function IntersectDemo() As Boolean Dim returnValue As Boolean = True Dim snIdPerm1, snIdPerm2, snIdPerm3 As StrongNameIdentityPermission snIdPerm1 = New StrongNameIdentityPermission(blob, "MyCompany.MyDepartment.*", New Version("220.127.116.11")) snIdPerm2 = New StrongNameIdentityPermission(blob, "MyCompany.MyDepartment.MyFile", New Version("18.104.22.168")) Try snIdPerm3 = CType(snIdPerm1.Intersect(snIdPerm2), StrongNameIdentityPermission) Console.WriteLine("The intersection of MyCompany.MyDepartment.*" + "MyCompany.MyDepartment.MyFile is " + CType(snIdPerm3, StrongNameIdentityPermission).Name.ToString()) Catch e As Exception Console.WriteLine("An exception was thrown: " + e.ToString()) returnValue = False End Try Return returnValue End Function 'IntersectDemo