C# an object reference is required problem

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in my main program I am trying to use

C#

stack.createStack(40);

in stack class I have this function

C#

public void createStack(object value)
       {
           stack S = new stack();
           head = new Node();
           head.Cont = value;
           size++;


       }

I am just trying to make a constructor function which will creare a new stack, stack defined like this

C#

<pre>public List<int> stacklist;
        public class Node
        {
            public object Cont;
            public Node Next;

        }
        public Node head;

        public stack()
        {
            head = null;
        }
        public stack(object value)
        {
            head = new Node();
            head.Cont = value;

        }

I get the error:

Error	CS0120	An object reference is required for the non-static field, method, or property 'stack.createStack(object)'	Lists

What I have tried:

I have no idea what to do next or how to avoid this

Posted 20-Feb-19 7:05am

Member 14157091

Updated 20-Feb-19 7:13am

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Comments

Richard Deeming 20-Feb-19 13:28pm

The createStack method creates a new stack instance, and throws it away. It then creates a new Node instance, stores the parameter in a field on that node, and then throws the node away. In then increments a size variable, which is not shown here.

You're also using camelCasing for types and methods, which goes against the naming guidelines[^]. Types, properties, and methods should use PascalCasing; you should only use camelCasing for parameters.

Combined with your confusion over static versus instance members, that suggests you would probably benefit from reviewing some introductory tutorials. For example:
Introduction to C# - interactive tutorials | Microsoft Docs[^]

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Mehdi Gholam · Accepted Answer · 2019-02-20T07:14:00

Solution 1

Try adding static like this :

C#

public static void createStack(object value)
{
    stack S = new stack();
    head = new Node();
    head.Cont = value;
    size++;
}

or using your class as follows if static is not what you need and your class has state :

C#

var s = new stack();
s.createStack(40);

Posted 20-Feb-19 7:14am

Mehdi Gholam

Updated 20-Feb-19 7:16am

v2

Comments

Member 14157091 20-Feb-19 14:36pm

Thank you very much, it worked :)