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There is no argument given that corresponds to the required formal parameter

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When working with Inheritance in C#, under certain circumstances, you might get an error message similar to this: There is no argument given that corresponds to the required formal parameter.

Don’t worry, the above error can be easily resolved.

Let’s see a full example, by first reproducing the error.

 

Reproducing the Error Message

Consider that you have a console application in C# that uses inheritance, and that you have the below base class:

//base class
public class BaseClass
{
    int id;

    public BaseClass(int i)
    {
        id = i;
    }

    public void baseClassMethod()
    {
        Console.WriteLine("This is the base class");
    }
}

 

Then you try to specify the child class that inherits from the baseClass as below:

//child class
public class childClass : BaseClass
{
    int id2;

    public childClass(int i)
    {
        id2 = i;
    }

    public void childClassMethod()
    {
        Console.WriteLine("This is the child class");
    }
}

 

You then try to compile and you you get the exact error message (for this example): There is no argument given that corresponds to the required formal parameter ‘i’ of ‘BaseClass.BaseClass(int)’

 

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How to Resolve the Issue

To resolve the issue, you just need to add a parameterless constructor in your base class:

//parameterless constructor
public BaseClass()
{
}

 

Here’s the full sample code that works:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace InheritanceBlog
{
    //base class
    public class BaseClass
    {
        int id;

        public BaseClass(int i)
        {
            id = i;
        }

        public BaseClass()
        {
        }

        public void baseClassMethod()
        {
            Console.WriteLine("This is the base class");
        }
    }


    //child class
    public class childClass : BaseClass
    {
        int id2;

        public childClass(int i)
        {
            id2 = i;
        }

        public void childClassMethod()
        {
            Console.WriteLine("This is the child class");
        }
    }



    class Program
    {
        static void Main(string[] args)
        {
            childClass c = new childClass(1);
            c.baseClassMethod();
            c.childClassMethod();

            Console.ReadLine();
        }
    }
}

 

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Reference: SQLNetHub.com (https://www.sqlnethub.com)

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