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readonly keyword

readonly keyword

Santosh Reddy

Santosh Reddy

9y824Visual Basic .NET

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication19

{

class a

{

public int www;

readonly string ww = "rrr";

public string check;

}

class b : a

{

public b(int www, string ww)

{

www = 123;

ww = "rrr";

}

public void get()

{

Console.WriteLine("enter details");

this.check = Console.ReadLine();

}

public b()

{

///// if will not taken in this constructor i got the some error if it given no error why?

}

public void dis()

{

Console.WriteLine("check is a" + this.check);

}

}

class c : b

{

static void Main(string[] args)

{

a obj = new a();

}

}

}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Tapan Patel9y ago
On top of Manas's answer, the reason you are getting the error becuase you have defined ww as readonly string and later in one of the constructors (in inherited class) you are trying to modify the value of this variable.
public b(int www, string ww)
{
www = 123;
ww = "rrr"; // here you should not change the value of readonly variable else it would result in error
}
0
Manas Mohapatra9y ago
readonly variable restricts from being changed. It's value can be intialized in runtime means inside constructor only. It can have different values based on constructors. You can assign value readonly when you declare a read only variable. Follow sample code:
class MyClass
{
    readonly int age;
    MyClass(int _age)
    {
        age = _age;
    }
    void ChangeAge()
    {
       // Custom logic
    }
}

MyClass cc =  new MyClass(28);
https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/readonly
0