C # Advanced Road --4.C # class attributes and methods

C # Advanced Road --C # class attributes and methods

basis:

1, the role of attributes: protection field, and the field value to be assigned is defined

Attributes

public class field which corresponds to c # property exposed to the outside, but it is different from the ordinary field attribute field just outside of the package, without any of its content, the method similar returned. Still need to set up internal fields. private class field corresponding to fields of the inner classes. Accessor properties can be viewed as private variables.

 

 

2, the use of the property:

grammar

[访问修饰符] _name(属性名) public [对应字段类型] 属性名Name { get{return _name;} set{_name=value;} }

 

 

 

 

 

 

 

 

 

3, field names and format attributes:

Naming fields commonly used: _cameCase

Naming fields commonly used: PascalCase

4, after the property had often to access the field through the property.

Properties are typically declared as public, fields are often declared as private.

Field external access class, are achieved through the property. g

et of values ​​can be defined set of assignments can be defined, generally we will get called and set accessor.

 5, is divided into four kinds of attributes,

1) both read and write: contains both get and set

2) Read Only: Contains only get

3) Write Only: Contains only set

4) automatic properties

 

Examples

class gwyy { private string _name; //字段 私有 public string Name { get { return _name + 'a'; } set { _name = value; } } //属性，公有 但是还是需要依赖于实体字段 }

 

method:

"Method" code block comprising a series of statements.

In C #, each of the instruction execution is done in the context of a method. Method declared in the class or structure. When you declare, you need to specify when declaring the access level, return values, method name, and any method parameters. Method parameter in parentheses and separated by commas. Empty parentheses method takes no parameters.

 

Class contains the following three methods:

class Motorcycle { public void StartEngine() { } public void AddGas(int gallons) { }  public int Drive(int miles, int speed) {    return 0;  } }

 

Advanced:

 

Static method

A static method does a specific instance of the class, call time, you need to specify the class name calling

 

Non-static method

 

 

Method overloading

The method of the same name, but different data types of the parameters, the number, order

 

variable parameter

We can accept a variable parameter in a one-dimensional array of columns to method parameters params properties

 

Examples

public void test1(params string[] list) { for (int i = 0; i < list.Length; i++) { Console.WriteLine(list[i]); } }

 

 

ref passed by reference

When you call a method, any changes made to parameters in the method are reacted in the variable. 使用ref参数 必须方法声明 和调用方都必须显示的使用 ref关键字

 

示例

int i = 3; Console.WriteLine(i); g.test2(ref i); Console.WriteLine(i); public void test2(ref int i) { i = 55; }

 

out定义输出参数

参数通过引用来传递。ref要求变量必须在传递前初始化。而out参数不用初始化。 必须声明和调用方都显示使用 out

 

示例

int value; g.test3(out value); public void test3(out int i) { i = 66; }

参考：

https://www.cnblogs.com/gwyy/p/8028872.html