C # Object-oriented encapsulation

Encapsulation refers to hiding the internal data of a class from being manipulated directly by an object instance, and in C # provides a property mechanism to manipulate the state inside the class.

Encapsulation in C # can be represented by keywords such as public, private, protected, and internal.

Why encapsulate the inside of a class?

Cases:

public class Person

{

public string name;

public int age;

}

If I instantiate this class above

Person P=new person ()

So I assign a negative to age, which is clearly not in line with the business logic, is the person's age likely to be negative?

P.age= "-1"

After using encapsulation

public class Person

{

private string name;

public string Name

{

Get{return name;}

Set{name=value;}

}

private int age;

public string Age

{

Get{return age;}

set{

if (value>0)

{

Age=value; The age is controlled, and the age must be greater than 0 to assign a value. Then the age of 1 is not assignable.

}

Else

{

Throw (New ArgumentException ("Error", Value, "Age cannot be negative"));//Throws an exception here

}

}

}

}

Once encapsulated, the object instance can only manipulate properties, and the properties may be controlled by writing down their own logic.

C # Object-oriented encapsulation