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FileDialogPermission.Union Method

Creates a permission that is the union of the current permission and the specified permission.

Namespace:  System.Security.Permissions
Assembly:  mscorlib (in mscorlib.dll)

public override IPermission Union(
	IPermission target
)

Parameters

target
Type: System.Security.IPermission

A permission to combine with the current permission. It must be of the same type as the current permission.

Return Value

Type: System.Security.IPermission
A new permission that represents the union of the current permission and the specified permission.

Implements

IPermission.Union(IPermission)

ExceptionCondition
ArgumentException

The target parameter is not null and is not of the same type as the current permission.

The result of a call to Union is a permission that represents all operations represented by both the current permission and the specified permission. Any demand that passes either permission passes their union.

The following code example shows how the Union method performs if you execute the method from your code. For the complete code example, see the FileDialogPermission class.

NoteNote:

The code example is intended to show the behavior of the method, not to demonstrate its use. In general, the methods of permission classes are used by the security infrastructure; they are not typically used in applications.

private bool UnionDemo()
{
    bool returnValue = true;

            fileDialogPerm3 = (FileDialogPermission)fileDialogPerm1.Union(fileDialogPerm2);

            if (fileDialogPerm3 == null)
            {
                Console.WriteLine("The union of " + fileDialogPerm1.Access + 
                    " and " + fileDialogPerm2.Access + " is null.");
            }
            else
            {
                Console.WriteLine("The union of " + fileDialogPerm1.Access + " and " +
                    fileDialogPerm2.Access + " = " +
                    ((FileDialogPermission)fileDialogPerm3).Access.ToString());
            }

    return returnValue;

}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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