Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Error when overriding base class constructor in subclass

Posted on 2008-10-05
7
1,083 Views
Last Modified: 2013-12-17
I receive the following error when I try to override a base class's constructor in a subclass.

An object reference is required for the non-static field, method, or property 'Chapter_6_project_3.Bee.weight'

attached is the relevant code, with a comment showing where the error is received.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Chapter_6_project_3;
 
namespace chapter_6_project_3
{
    class Worker : Bee
    {
        public Worker(string[] jobsICanDo) : base(weight) //ERROR HERE!!!! it's for the base's parameter weight
        {
            this.jobsICanDo = jobsICanDo;
        }
 
        public override int ShiftsLeft
        {
            get
            {
                return shiftsToWork - shiftsWorked;
            }
        }
 
        private string currentJob = "";
        private string[] jobsICanDo;
        private int shiftsToWork;
        private int shiftsWorked;
 
        public string CurrentJob
        { 
            get
            {
                return currentJob;
            }
        }
 
        public bool DoThisJob(String potentialJob, int potentialShiftsToWork)
        {
            if (!String.IsNullOrEmpty(CurrentJob))
                return false;
 
            for (int i = 0; i < jobsICanDo.Length; i++)
            {
                if (potentialJob == jobsICanDo[i])
                {
                    currentJob = potentialJob;
                    shiftsToWork = potentialShiftsToWork;
                    return true;
                }
            }
 
            return false;
        }
 
        public bool WorkOneShift()
        {
            if (String.IsNullOrEmpty(currentJob))
                return false;
            shiftsWorked++;
 
            if (shiftsWorked > shiftsToWork)
            {
                shiftsWorked = 0;
                shiftsToWork = 0;
                currentJob = "";
                return true;
            }
            else
                return false;
        }
    }
}
 
 
//following ith base class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace Chapter_6_project_3
{
    class Bee
    {
        public Bee(double weight)
        {
            this.weight = weight;
        }
 
        public virtual int ShiftsLeft
        {
            get
            {
                return 0;
            }
        }
 
        private double weight;
 
        public virtual double GetHoneyConsumption()
        {
            double consumption;
            if (ShiftsLeft == 0)
                consumption = 7.5;
            else
                consumption = 9 + ShiftsLeft;
 
            if (weight > 150)
                consumption *= 1.35;
 
            return consumption;
        }
    }
}

Open in new window

0
Comment
Question by:jabrthel
  • 4
  • 3
7 Comments
 
LVL 6

Expert Comment

by:RishadanPort
ID: 22647549
yes there is no varible defined "weight"
0
 
LVL 6

Accepted Solution

by:
RishadanPort earned 125 total points
ID: 22647558
You need to declare your Worked constructor differently in order for it to work, like this:

public Worker(string[] jobsICanDo, double weight) : base(weight) <-- this will work
0
 

Author Comment

by:jabrthel
ID: 22647563
Yeah... but it's a parameter passed into the base class.  Isn't the structure as follows...
public class Class1 : base (baseParam1, baseParam2, etc.)
{
}

Open in new window

0
Space-Age Communications Transitions to DevOps

ViaSat, a global provider of satellite and wireless communications, securely connects businesses, governments, and organizations to the Internet. Learn how ViaSat’s Network Solutions Engineer, drove the transition from a traditional network support to a DevOps-centric model.

 

Author Comment

by:jabrthel
ID: 22647566
Oh... ok, I see
0
 

Author Comment

by:jabrthel
ID: 22647573
Yup, that's it.
0
 

Author Closing Comment

by:jabrthel
ID: 31503314
Well, that was a beginner's mistake.
0
 
LVL 6

Expert Comment

by:RishadanPort
ID: 22647583
using the keyword "base" means that you are dealing with the parent object.

If you do this:

base()   or base(  ... parameters ... )

You are constructing your parent object in a certain way.


You can also do this:

base.someMethod() or base.someVariable    as well
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
How to remove superseded packages in windows w60 or w61 installation media (.wim) or online system to prevent unnecessary space. w60 means Windows Vista or Windows Server 2008. w61 means Windows 7 or Windows Server 2008 R2. There are various …
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question