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WebPermission.Union Method

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

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

'Declaration
Public Overrides Function Union ( _
	target As IPermission _
) As IPermission
'Usage
Dim instance As WebPermission
Dim target As IPermission
Dim returnValue As IPermission

returnValue = instance.Union(target)
public IPermission Union (
	IPermission target
)
public override function Union (
	target : IPermission
) : IPermission

Parameters

target

The WebPermission to combine with the current WebPermission.

Return Value

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 a null reference (Nothing in Visual Basic), the method returns a copy of the current WebPermission.
Exception typeCondition

ArgumentException

target is not a null reference (Nothing in Visual Basic) 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
 

// Create another WebPermission that is the Union of previous two 
// WebPermission instances.
WebPermission myWebPermission3 = 
    (WebPermission) myWebPermission1.Union(myWebPermission2);
Console.WriteLine("\nAttributes and values of the WebPermission after" 
    + " the Union are : ");
// Display the attributes,values and children.
Console.WriteLine(myWebPermission3.ToXml().ToString());

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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