Check if variable is being modified within a class

Question

My code:

public int Position
{
    get
    {
        return position;
    }
    private set
    {
        position = value;
    }
}

Currently 'Position' cannot be modified outside the class.

When I do

MyClass.Position = 1

Visual Studio gives me the error The property or indexer 'MyClass.Position' cannot be used in this context because the set accessor is inaccessible. Is there a way to change the code such that I can check if the variable is being modified within the class or outside of class and throw new InvalidOperationException if the variable is being changed outside of the class?

I want to throw the error myself instead of Visual Studio stopping me.

Thank you in advance!

Answer 1

You could make a "internal_set" flag and set to true when you set value internally.

    public class MyClass
    {
        private int position;
        private bool internal_set = false;
        public int Position 
        {
            get
            {
                return position;
            }
            set
            {
                if (internal_set)
                {
                    position = value;
                    internal_set = false;    //set flag back to false;
                }
                else
                {
                    throw new InvalidOperationException();
                }
            }
        }
        public void set()
        {
            internal_set = true;  //You need set the flag to true before set value;
            Position = 1;
        }
    }