CodeAccessPermission.Union Method
.NET Framework 3.0
When overridden in a derived class, creates a permission that is the union of the current permission and the specified permission.
Namespace: System.Security
Assembly: mscorlib (in mscorlib.dll)
Assembly: mscorlib (in mscorlib.dll)
public IPermission Union ( IPermission other )
public function Union ( other : IPermission ) : IPermission
Not applicable.
Parameters
- other
A permission to combine with the current permission. It must be of the same type as the current permission.
Return Value
A new permission that represents the union of the current permission and the specified permission.The result of a call to Union is a permission that represents all the operations represented by both the current permission and the specified permission. Any demand that passes either permission passes their union.
Notes to Inheritors: You must override this method in a derived class. You should return a copy of the permission if the value of the other parameter is a null reference (Nothing in Visual Basic).The following code example shows an override of the Union method. This code example is part of a larger example provided for the CodeAccessPermission class.
public: virtual IPermission^ Union( IPermission^ target ) override { #if ( debug ) Console::WriteLine( "************* Entering Union *********************" ); #endif if ( target == nullptr ) { return this; } #if ( debug ) Console::WriteLine( "This is = {0}", ((NameIdPermission)this).Name ); Console::WriteLine( "Target is {0}", ((NameIdPermission)target).m_Name ); #endif if ( !VerifyType( target ) ) { throw gcnew ArgumentException( String::Format( "Argument_WrongType", this->GetType()->FullName ) ); } NameIdPermission^ operand = dynamic_cast<NameIdPermission^>(target); if ( operand->IsSubsetOf( this ) ) { return this->Copy(); } else if ( this->IsSubsetOf( operand ) ) { return operand->Copy(); } else { return nullptr; } }
Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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