Creates a permission that is the union of the current permission and the specified permission.
Assembly: mscorlib (in mscorlib.dll)
- Type: System.Security.IPermission
A permission to combine with the current permission. It must be of the same type as the current permission.
Return ValueType: System.Security.IPermission
A new permission that represents the union of the current permission and the specified permission.
The target parameter is not null and is not of the same type as the current permission.
The permissions are not equal and one is not a subset of the other.
The result of a call to is a permission that represents all the sites represented by both the current permission and the specified permission. Any demand that passes either permission passes their union. For example, the union of a permission that represents access to www.fourthcoffee.com and one that represents access to *.fourthcoffee.com is a permission that represents access to *.fourthcoffee.com.
The union of a permission and null is the permission that is not null. The union of a permission and a subset of that permission is the permission that contains the subset. Any other combination results in an ArgumentException being thrown. For example, the union of the site identity www.fourthcoffee.com and the site identity www.tailspintoys.com results in an exception because neither is a subset of the other.