C #-classes, interfaces, constructors, destructors,

Definitions of classes and interfaces:

• class with The class keyword is defined, and the interface is defined with the interface keyword.

• can use Public , the internal keyword defines the accessibility of classes and interfaces;

• class can be defined as abstract or sealed to control inheritance;

• The parent class and the parent class interface are specified in a comma-delimited list, placed after the class or interface name and a colon.

• In a class definition, you can specify only one parent class, and must be the first item in the list;

1. definition of Class

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2. abstract class (inheritable, cannot be instantiated )

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3. sealed Class (non-inheriting)

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4. Inheritance of classes

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an inner class can inherit from a common base class, but the public base class cannot inherit from an inner class.

Classes inherit from interfaces and classes, and all interface members must be implemented in a class that supports that interface.

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5. combinations of access modifiers that can be used in a class:

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6. the definition of the interface, the interface does not contain implementation code, are implemented in the class.

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7. Inheritance of interfaces

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8. System.Object base class

all classes are inherited from the System.Object

Object methods to include:

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GetType () and the typeof () Use of:

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9. Constructors and destructors: The compiler automatically adds them, initializes and cleans up objects

Constructors and destructors:

• Classes automatically have implementation code with default constructors and destructors, and we rarely need to provide our own destructors, which can be defined using accessibility, class names, and any parameters that might be required.

• The constructor of the base class is executed before the constructor of the derived class.

• Use This and the Base constructor Initialization keywords, you can control the execution order of these constructors in the class;

Constructor Execution Order:

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Destruction function

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. Net Framework to ensure that the call Finalize () Method

the symbols in Class view

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Object Browser:

View-object Browser

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Add Class , The class name you create is named after the file name.

Add-new Item

class diagram:Show Base type

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Class Library project:

Class Library:

• You can create class library projects that contain only class definitions that cannot be executed directly, but must be accessed through the client code in an executable program . VS and the VCE provides various tools for creating, modifying, and testing classes

Class Series:

• Classes can be combined into series to provide common operations or to share common features. To do this, you can inherit from the base class (which can be abstract), or implement the interface;

The Class Library project is compiled to . DLL Assembly , you can access its contents by adding a reference to the class Library project in other projects. Project-add Reference

This article comes from the "Ricky's blog" blog, please be sure to keep this source http://57388.blog.51cto.com/47388/1651610

C #-classes, interfaces, constructors, destructors,