Auto Property In C# 6.O

The auto property came into existence at C# version 3.0. It is used for code simplification and by using this your code becomes more readable


One of the great features of c# is you can declare a property.

Code:

public class Student
    {
        public Guid Id { get; }=Guid.NewGuid();
    }

In this code, you can initialize the property at the time of declaration. By using this feature you don’t have a need to write a constructor and initialize the property in that constructor.

In the previous version of c# we not able to write a property only with get.



Above image shows it will give an error in c# version 5.0 and below but if you declared read-only property in c# it will not throw an error. Below is the image of version 6.0



Why auto-property initialization needed?
Suppose I have a class like below

Code:

public class Student
    {
       public string Fname { get; private set; }
    }

I am writing this code because I want my property read-only and I don’t want to set value from outside. But somehow by mistake, I implement one method and changed the value of that Fname field like below which is completely valid.

Code:

public class Student
    {
       public string Fname { get; private set; }

       public void ByMistake()
       {
           Fname = "sagar";
       }
    }

To avoid this in C# 6.0 introduced auto property initialization for read-only field and our code become

Code:

public class Student
    {
        public string Fname { get; } = "Mr.";

    }

By using this our field becomes Immutable.





And if try to change in the class itself it gives the compile-time error.

Code:

  public class Student
    {
        public string Fname { get; } = "Mr.";

        public void tryToChange()
        {
            Fname = "sagar";
        }
    }

Check below code by that you will able to change read-only property value but it is in the constructor.

Code:

public class Student
    {
        public string Fname { get; } = "Mr.";

        public Student()
        {
            Fname = "sagar";
        }

        public void tryToChange()
        {
            Fname = "sagar";
        }
    }