WebPermission.Union Method (IPermission)

 

Returns the logical union between two instances of the WebPermission class.

Namespace:   System.Net
Assembly:  System (in System.dll)

Public Overrides Function Union (
	target As IPermission
) As IPermission

Parameters

target
Type: System.Security.IPermission

The WebPermission to combine with the current WebPermission.

Return Value

Type: System.Security.IPermission

A WebPermission that represents the union of the current instance and the target parameter. If either WebPermission is Unrestricted, the method returns a WebPermission that is Unrestricted. If the target is null, the method returns a copy of the current WebPermission.

Exception Condition
ArgumentException

target is not null or of type WebPermission.

Union returns a WebPermission that contains all the permissions in both target and the current instance.

The following example takes the logical union of two WebPermission instances to create a third instance of WebPermission.

   ' Create another WebPermission that is the Union of previous two WebPermission 
   ' instances.
   Dim myWebPermission3 As WebPermission = CType(myWebPermission1.Union(myWebPermission2), WebPermission)
   Console.WriteLine(ControlChars.Cr + "Attributes and values of the WebPermission after the Union are : ")
   ' Display the attributes,values and children.
   Console.WriteLine(myWebPermission3.ToXml().ToString())
End Sub 'CreateUnion

.NET Framework
Available since 1.1
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