CODEWITHSUNDEEP
c#constructordefault-constructor
ScottT
ScottT

Reputation: 39

How to call constructor with 2 arguments from a no argument constructor?

I am having trouble wrapping my head around this one. I have 2 constructors. The first has 2 arguments:

public Instrument(string name, string category)
{
    this.Name = name;
    this.Category = category;
}

Then I have a default(no argument) constructor with constants for defaults:

public Instrument()            
{
    this.Name = DefaultName;
    this.Category = DefaultCategory;
}

I am also supposed to call the 2 parameter constructor from the no argument constructor. How do I do this? I also question why this is even necessary. If you are calling the 2 parameter from the default how would you ever pass the default values to the application? So I guess my main question is how do I call the 2 parameter constructor from the default constructor?

Upvotes: 2

Views: 4857

Answers (2)

RRR
RRR

Reputation: 116

This is how you can do this...

public class Instrument
{
    public string Name;
    public string Category;

    public Instrument()
        : this("DefaultName", "DefaultCategory")
    {

    }

    public Instrument(string name, string category)
    {
        this.Name = name;
        this.Category = category;
    }
}

Now to answer the question why this is even necessary....

This is to make sure that if you ever come across an instantiated object inside the code - doesn't matter how it was instantiated (using either of constructor) - it will always have valid values in it's properties Name & Category.

Basically, it potentially makes your business objects bug free. Anyone using your business object will always have valid values in it's properties - either default or passed in using 2nd constructor.

Upvotes: 2

Shadow
Shadow

Reputation: 4006

by calling the two arg constructor from the default one, passing the default values, like this:

public Instrument() : this(DefaultName, DefaultCategory)
{

}

Upvotes: 8

Related Questions