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This article mainly explains "detailed introduction of C# categories and objects". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn the "detailed introduction of C# classes and objects"!

Catalogue

I. definition and creation of objects

2. Initialization of the object

1. With the aid of a constructor or using the

two。 Instance constructor

3. Static structure

III. Citation of objects

I. definition and creation of objects

The method to define a class object is:

Class name object name

The class is of a reference type, and when an object is defined, the system allocates storage space for the data reference, but the space used to hold the object's actual data is not allocated.

Creation of object

You need to use the new operator when creating objects. The new operator can allocate and initialize memory for any instance of a specified class type.

The syntax for creating an object is as follows: object name = new class name ()

Code examples, definition and creation of objects:

Class Program {static void Main (string [] args) {/ / definition and creation of Test t = new Test (); / / or define Test T1 first; / / create T1 = new Test ();}} class Test {}

When creating row objects, you need to pay attention to:

The new operator is followed by the class name of the class to which the object to be created belongs

Parentheses after class name cannot be omitted

You can combine the definition and creation of an object

2. Initialization of the object

There are two ways to implement object initialization in C#:

With the aid of a constructor or using the

Object initialization list.

1. With the aid of a constructor or using the

The parameters in the parentheses of the expression of new operation are not arbitrary. Whether the parentheses support parameters and how many parameters can be carried are determined by the constructor form of the class to which the object belongs.

The class of C # supports two kinds of constructors: instance constructor and static constructor

The instance constructor is a member that implements the actions required to initialize the class instance.

A static constructor is a member used to implement the operations required to initialize the class itself the first time it is loaded.

The static constructor of the C # class initializes the project at the class level. Typically, the static constructor initializes the static fields of the class.

Project initialization at the class level must be before any static members are referenced and before all objects of the class are created.

two。 Instance constructor

The instance constructor is a special method that is executed when each new object of the class is created to initialize the state of the object.

The instance constructor should be declared as public.

The following is the general definition of the instance constructor:

/ / No parameter construction public class name () {function body} / / construct public class name with parameter (parameter list) {function body}

Note when defining an instance constructor:

Instance constructor can be with or without parameters

The parameter setting of the instance constructor determines the parameter format in parentheses in the new operation expression when the object is created.

The instance constructor can be overloaded.

Other instructions:

When the instance constructor is not explicitly provided in the class declaration, the compiler provides an implicit default constructor.

The default constructor takes no arguments, and the method body is empty.

When you call the default constructor to implement object creation, the parentheses after the new operation expression cannot have parameters.

3. Static structure

Static constructor:

The static constructor of the C # class initializes the project at the class level.

Typically, the static constructor initializes the static fields of the class.

Project initialization at the class level must be before any static members are referenced and before all objects of the class are created.

When using static constructors, note that:

The static constructor has only one, cannot be overloaded, and cannot take arguments

Static constructors cannot have access modifiers, which are called automatically by the system

The static constructor and instance constructor of a class can coexist

Static constructors cannot access instance members of a class.

Code example:

Class Program {static void Main (string [] args) {Test t = new Test (); / / output: 0Test 0 Console.WriteLine (t.X + "," + t.Y + "," + Test.Z) Test T1 = new Test (1mem2); / / output: 1meme2 Console.WriteLine (t1.X + "," + t1.Y + "," + Test. Test T2 = new Test (3jue 4); / / output: 3Jing 4Jing 3 Console.WriteLine (t 2.X + "," + t 2.Y + "," + Test. Console.ReadLine ();}} class Test {public int X = 0; public int Y = 0; public static int Z = 0; / / Parametric construction public Test () {Zipple;} / / Parametric construction public Test (int X, int Y) {this.X = X; this.Y = Y; Zqi + } / / static construction-initialize Z value static Test () {Z = 0;}} III. Reference to the object

The reference form of object members is as follows:

Object name. Instance member name / or object name. Instance member name (argument list)

Operation of objects two objects of the same class support assignment, equality and unequal operations. As follows:

Test t = new Test (); Test T1 = new Test (); / / output: falseConsole.WriteLine (t = = T1); / / the assignment operation of the object t = T1 position / output: true-- > at this time, tCommerce T1 is expressed as the same object Console.WriteLine (t = = T1); at this point, I believe you have a deeper understanding of the "detailed introduction of C# classes and objects", you might as well do it in practice! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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