May 11, 2021 C#
Property is a named member of a class, structure, and interface. A member variable or method in a class or structure is called a domain. P roperty is an extension of the field and can be accessed using the same syntax. They use accessors to make the values of private domains read, write, or manipulate.
Property does not determine where to store it. Instead, they have accessors that read and write or calculate their values.
For example, there is a class called Student with private domains of age, name, and code. We can't access these domains directly outside the scope of the class, but we can have properties that access those private domains.
Property's accessor contains executable statements that help you get (read or calculate) or set (write) properties. A n accessor declaration can contain a get accessor, a set accessor, or both. For example:
// 声明类型为 string 的 Code 属性
public string Code
{
get
{
return code;
}
set
{
code = value;
}
}
// 声明类型为 string 的 Name 属性
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
// 声明类型为 int 的 Age 属性
public int Age
{
get
{
return age;
}
set
{
age = value;
}
}The following example demonstrates the use of property:
using System;
namespace tutorialspoint
{
class Student
{
private string code = "N.A";
private string name = "not known";
private int age = 0;
// 声明类型为 string 的 Code 属性
public string Code
{
get
{
return code;
}
set
{
code = value;
}
}
// 声明类型为 string 的 Name 属性
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
// 声明类型为 int 的 Age 属性
public int Age
{
get
{
return age;
}
set
{
age = value;
}
}
public override string ToString()
{
return "Code = " + Code +", Name = " + Name + ", Age = " + Age;
}
}
class ExampleDemo
{
public static void Main()
{
// 创建一个新的 Student 对象
Student s = new Student();
// 设置 student 的 code、name 和 age
s.Code = "001";
s.Name = "Zara";
s.Age = 9;
Console.WriteLine("Student Info: {0}", s);
// 增加年龄
s.Age += 1;
Console.WriteLine("Student Info: {0}", s);
Console.ReadKey();
}
}
}When the above code is compiled and executed, it produces the following results:
Student Info: Code = 001, Name = Zara, Age = 9
Student Info: Code = 001, Name = Zara, Age = 10Abstract classes can have abstract properties that should be implemented in derived classes. The following procedure illustrates this point:
using System;
namespace tutorialspoint
{
public abstract class Person
{
public abstract string Name
{
get;
set;
}
public abstract int Age
{
get;
set;
}
}
class Student : Person
{
private string code = "N.A";
private string name = "N.A";
private int age = 0;
// 声明类型为 string 的 Code 属性
public string Code
{
get
{
return code;
}
set
{
code = value;
}
}
// 声明类型为 string 的 Name 属性
public override string Name
{
get
{
return name;
}
set
{
name = value;
}
}
// 声明类型为 int 的 Age 属性
public override int Age
{
get
{
return age;
}
set
{
age = value;
}
}
public override string ToString()
{
return "Code = " + Code +", Name = " + Name + ", Age = " + Age;
}
}
class ExampleDemo
{
public static void Main()
{
// 创建一个新的 Student 对象
Student s = new Student();
// 设置 student 的 code、name 和 age
s.Code = "001";
s.Name = "Zara";
s.Age = 9;
Console.WriteLine("Student Info:- {0}", s);
// 增加年龄
s.Age += 1;
Console.WriteLine("Student Info:- {0}", s);
Console.ReadKey();
}
}
}When the above code is compiled and executed, it produces the following results:
Student Info: Code = 001, Name = Zara, Age = 9
Student Info: Code = 001, Name = Zara, Age = 10using System;
namespace Demo.cs
{
class Program
{
public abstract class Person
{
public abstract string Name { get; set; }
public abstract int Age { get; set; }
}
public class Student : Person
{
public string Code { get; set; } = "N.A";
public override string Name { get; set; } = "N.A";
public override int Age { get; set; } = 0;
public override string ToString()
{
return $"Code:{Code},Name:{Name},Age:{Age}";
}
}
static void Main(string[] args)
{
var s = new Student()
{
Code = "001",
Name = "Zara",
Age = 10
};
System.Console.WriteLine($"Student Info:={s}");
s.Age++;
System.Console.WriteLine($"Student Info:={s}");
}
}
}