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CodeAccessPermission.Union Method

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)

public virtual IPermission Union (
	IPermission other
)
public IPermission Union (
	IPermission other
)
public function Union (
	other : IPermission
) : IPermission

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.

Exception typeCondition

NotSupportedException

The other parameter is not a null reference (Nothing in Visual Basic). This method is only supported at this level when passed a null reference (Nothing in Visual Basic).

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 override IPermission Union(IPermission target)
        {
#if(debug)
            Console.WriteLine ("************* Entering Union *********************");
#endif
            if (target == null)
            {
                return this;
            }
#if(debug)
            Console.WriteLine ("This is = " + (( NameIdPermission)this).Name);
            Console.WriteLine ("Target is " + (( NameIdPermission)target).m_Name);
#endif
            if (!VerifyType(target))
            {
                throw new ArgumentException (String.Format ("Argument_WrongType", this.GetType ().FullName));
            }

             NameIdPermission operand = ( NameIdPermission)target;

            if (operand.IsSubsetOf (this)) return this.Copy ();
            else if (this.IsSubsetOf (operand)) return operand.Copy ();
            else
                return null;
        }

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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