An object reference is required for the non-static field, method, or property in interfaces

Question

2.00/5 (3 votes)

See more:

C#

class Program: abc
    {
        static void Main(string[] args)
        {
            Console.WriteLine("hello interface");

            xyz();

            Console.ReadLine();
            return;
        }
        public void xyz()
        {
            Console.WriteLine("interface XYZ");
        }
    }
    interface abc
    {
        void xyz();
    }

Posted 22-Jun-14 7:10am

larkspurklose3

Add a Solution

Comments

Herman<T>.Instance 22-Jun-14 13:29pm

public static void xyz()
or Program prg = new Program(); prg.xyz();

larkspurklose3 22-Jun-14 13:35pm

instead of
Program prg = new Program(); prg.xyz();

if i would write
abc prg = new Program(); prg.xyz();

is it fine to do so..??

Raul Iloc 22-Jun-14 15:20pm

Yes is fine also, because your "Program" class implements the interface.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Raul Iloc · Accepted Answer · 2014-06-22T09:24:00

You are trying to access an instance member directly into your Main() without to use an object, and this in incorrect. You must first create an object then use its method like in the next example:

C#

abc testObject = new Program(); //The object is declared as interface "abc" but could be also declared of type "Program"!
testObject.xyz();

Sergey Alexandrovich Kryukov · Accepted Answer · 2014-06-22T08:05:00

Your piece of code in your comment is now correct. You need to learn what are instance members vs public ones, the role of "this" parameter and understand general object-oriented syntax and semantic behind it (no, this is not yet OOP, just one of the prerequisites). Please see my past answers:
Type casting in c#[^],
C# windows base this key word related and its uses in the application[^],
What makes static methods accessible?[^].

—SA

An object reference is required for the non-static field, method, or property in interfaces

2 solutions

Solution 2

Solution 1

Add your solution here

Preview 0