Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about the use of the sealed keyword in C#. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

1. Sealed keyword

When a sealed modifier is applied to a class, this modifier prevents other classes from inheriting from that class. Similar to the final keyword in Java.

In the following example, class B inherits from class A, but no class can inherit from class B.

2. Sealed modifier method or property

Allows classes to inherit from the base class and prevents them from overriding specific virtual methods or virtual properties.

1) sealed is used with override for virtual methods or attributes. If it is not virtual methods or attributes, an error will be reported: cannot be sealed because it is not an override

Public class D {/ * ConsoleApplication1.MSFun.Sealed.D.M ()'* cannot be sealed because it is not an override * / public sealed void M () {Console.WriteLine ("D.M ()");}}

2) prevent subclasses from overriding specific methods or properties

Public class A {protected virtual void M () {Console.WriteLine ("A.M ()");} protected virtual void M1 () {Console.WriteLine ("A.M1 ()");} public class B: a {protected sealed override void M () {Console.WriteLine ("B.M ()");} protected override void M1 () {Console.WriteLine ("B.M1 ()") }} public sealed class C: B {/ * ConsoleApplication1.MSFun.Sealed.C.M ()': * cannot override inherited member 'ConsoleApplication1.MSFun.Sealed.B.M ()' * because it is sealed * / protected override void M () {Console.WriteLine ("C.M ()");} protected override void M1 () {Console.WriteLine ("C.M1 ()") }} the above is the usefulness of the sealed keyword in C# shared by the editor. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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