C# 2.0 introduction a new concept, called asymmetric Accessor Accesibility, which assentialy means you can modify the visibility of either the get accesor or set accesor on class property thah has both a getter and setter. This allows you do something like bellow
public class Customer { private int _customerID; private string _firstname = string.Empty; private string _lastname = string.Empty; public int ID { get { return _customerID; } internal set { _customerID = value; } } }
Here we have restricted the visibility of the set accessor to internal which means only a class in the same assembly as Customer can set the ID of the Customer via set accsessor. There a few restrictions to this new asymmetric accessor accessibility feature om C# 2.0 the most relavant are :
1. You can only set a different visibility on 1 of the 2 accessor, not both. Trying to restrict visibility on both get and set to internal will give the following error:
"Cannot spesify accesibility modifiers for both accessors of the property or indexwe"
2. You cannot use the feature on preperties that do not have BOTH a get and ser accessor. removing the get accessor from the example above will give you this lovely error:
"Accessibility modifier on accessor may only be used if property or indexer has both a get and a set accessor"
3. The accessibility modifier user on a get or set accessor can only restrict visibility not increase it. Hence doing something like this:
public class Customer { private int _customerID; private string _firstname = string.Empty; private string _lastname = string.Empty; protected int ID { get { return _customerID; } public set { _customerID = value; } } }
Would give you the following error because the property has a protected acces modifier that is more restrictive than the public set accessor and not the other way arround: "Accessor must be more restrictive than the property or indexer"
I have yet to use the Asymmetric Accessor Accessibility Feature of C# 2.0, but it is good know it is there. For more information on new language feature in C# 2.0, you can always check out the C# Programmung Guide on MSDN
9guowenhao0827
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