14.6.seven Abstract procedures
A conceptual means report raises a special virtual strategy however, do not provide an utilization of you to approach. Instead, non-conceptual derived kinds have to offer their own implementation by the overriding one to approach. Because the a conceptual means brings no actual execution, the method_system out-of a conceptual strategy merely contains an excellent semicolon.
the shape class talks of new abstract concept of an excellent geometrical profile target that may paint by itself. The latest Painting experience conceptual because there is no meaningful standard implementation. The new Ellipse and you can Container classes was tangible Profile implementations. Mainly because classes try low-conceptual, he’s expected to bypass brand new Color strategy and offer an genuine implementation. avoid analogy
A conceptual method statement try allowed to override a virtual approach. This enables an abstract class to force re also-implementation of the procedure in the derived kinds, and you may makes the modern utilization of the method not available.
classification An effective declares an online strategy, category B overrides this procedure with a conceptual strategy, and you can group C overrides the fresh new abstract method to bring its own implementation. end analogy
14.6.8 Exterior strategies
When a method statement is sold with a keen extern modifier, the process is claimed become an external method. Outside strategies is actually implemented on the exterior, generally using a words apart from C#. Just like the an outward method report provides not any execution, the method_human body away from an external means merely contains a good semicolon. An external method should never be universal.
fourteen.six.nine Partial actions
Whenever a strategy declaration is sold with a partial modifier, you to method is 
said to be a limited strategy. Partial methods may only end up being proclaimed because the members of partial brands (§14.dos.7), and therefore are subject to a lot of limitations.
Limited actions are outlined in one single part of a questionnaire statement and then followed an additional. The latest execution try optional; in the event the no part tools this new partial means, this new partial method declaration and all of calls in order to they are got rid of in the type statement as a consequence of the mixture of the bits.
Limited methods will maybe not establish supply modifiers; he or she is implicitly personal. The get back kind of is going to be gap , as well as their variables will n’t have the latest out modifier. The identifier partial is regarded as an excellent contextual search term (§6.cuatro.4) from inside the a method declaration only when it appears to be instantaneously before the emptiness keyword. A limited strategy don’t explicitly use program actions.
There have been two types of limited method declarations: If your system of your own approach report try a beneficial semicolon, new report is said become a determining limited method statement. In case your body’s provided due to the fact an excellent take off, the fresh declaration is claimed are an implementing partial method statement. Along the components of a type report, there is only one determining limited strategy declaration having an effective considering trademark, and there may be only 1 using limited approach declaration which have confirmed trademark. In the event the an implementing limited strategy report is offered, a matching defining partial strategy report shall occur, and the declarations shall fits because specified in the pursuing the:
- New elizabeth modifiers (however fundamentally in identical purchase), means term, level of type details and you may level of details.
- Involved details regarding the age modifiers ( not necessarily in the same buy) plus the same items (modulo variations in variety of factor brands).
- Corresponding sorts of details from the age restrictions (modulo variations in form of factor names).
Simply a defining limited means participates when you look at the overload quality. For this reason, even in the event an applying report is offered, invocation terms may resolve so you can invocations of one’s partial approach. Given that a partial method constantly output emptiness , instance invocation words will still be term comments. Furthermore, since a limited system is implicitly private , such as for instance comments are always can be found within one of parts of the kind statement in this which the partial method is stated.
