SocketPermission.Union Method (IPermission)
Returns the logical union between two SocketPermission instances.
Assembly: System (in System.dll)
Return ValueType: System.Security.IPermission
The result of a call to Socket connections represented by the current instance as well as the access represented by target. Any demand that passes either the current instance or target passes their union. This method overrides Union and is implemented to support the IPermission interface.is a permission that represents all of the access to
The following example uses the SocketPermission instances.method to return the logical union of two existing
' Creates a SocketPermission restricting access to and from all URIs. Dim mySocketPermission1 As New SocketPermission(PermissionState.None) ' The socket to which this permission will apply will allow connections from www.contoso.com. mySocketPermission1.AddPermission(NetworkAccess.Accept, TransportType.Tcp, "www.contoso.com", 11000) ' Creates a SocketPermission which will allow the target Socket to connect with www.southridgevideo.com. Dim mySocketPermission2 As New SocketPermission(NetworkAccess.Connect, TransportType.Tcp, "www.southridgevideo.com", 11002) ' Creates a SocketPermission from the union of two SocketPermissions. Dim mySocketPermissionUnion As SocketPermission = CType(mySocketPermission1.Union(mySocketPermission2), SocketPermission) ' Checks to see if the union was successfully created by using the IsSubsetOf method. If mySocketPermission1.IsSubsetOf(mySocketPermissionUnion) And mySocketPermission2.IsSubsetOf(mySocketPermissionUnion) Then Console.WriteLine("This union contains permissions from both mySocketPermission1 and mySocketPermission2") ' Prints the allowable accept URIs to the console. Console.WriteLine("This union accepts connections on :") Dim myEnumerator As IEnumerator = mySocketPermissionUnion.AcceptList While myEnumerator.MoveNext() Console.WriteLine(CType(myEnumerator.Current, EndpointPermission).ToString()) End While Console.WriteLine("This union establishes connections on : ") ' Prints the allowable connect URIs to the console. Console.WriteLine("This union permits connections to :") myEnumerator = mySocketPermissionUnion.ConnectList While myEnumerator.MoveNext() Console.WriteLine(CType(myEnumerator.Current, EndpointPermission).ToString()) End While End If
Available since 1.1