C# Calling base constructor

Question

I've Google'd "calling base constructor", and I'm not getting the answers I need.

Here's the constructor I have;

public class defaultObject
{
    Vector2 position;
    float rotation;
    Texture2D texture;

    public defaultObject(Vector2 nPos, float nRotation, Texture2D nTexture)
    {
        position = nPos;
        rotation = nRotation;
        texture = nTexture;
    }
}

Now I have that in place, I want to inherit the constructor and all its workings. This is what I'd expect to do;

public class Block : defaultObject
{
    // variables inherited from defaultObject
    public Block : defaultObject; //calls defaultObject constructor
}

Why can't I do that?

Jon Egerton · Accepted Answer · 2014-02-20 12:27:30Z

6

Use : base():

public class Block : defaultObject
{
    // variables inherited from defaultObject
    public Block ()
        : base()
    {}
}

or with parameters:

public class Block : defaultObject
{
    // variables inherited from defaultObject
    public Block (Vector2 nPos, float nRotation, Texture2D nTexture)
        : base(nPos, nRotation, nTexture)
    {}
}

edited Feb 20, 2014 at 12:27

answered Feb 20, 2014 at 12:16

Jon Egerton

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2 Comments

ShadowByte Over a year ago

I tried using : base(), now it's complaining that ':' is an invalid token.

Jon Egerton Over a year ago

I missed the () on the parameterless constructor, try adding those.

Thorsten Dittmar · Accepted Answer · 2014-02-20 12:17:38Z

1

Why is it hiding an inherited member?

Because I bet the method in the base class is not marked virtual.

I see that you removed that part of the question. Well, I've answered it anyway now...

answered Feb 20, 2014 at 12:17

Thorsten Dittmar

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1 Comment

ShadowByte Over a year ago

Just fixed that, merci.

Nikola Dimitroff · Accepted Answer · 2014-02-20 12:18:03Z

0

To call the base class's constructor:

public class Block : defaultObject
{
    // variables inherited from defaultObject
    public Block(npos, rotation, texture) : base(npos, rotation, texture); //calls defaultObject constructor
}

To override the update method, you must declare it virtual in the base class:

public virtual void update() { .. }

answered Feb 20, 2014 at 12:18

Nikola Dimitroff

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2 Comments

Thorsten Dittmar Over a year ago

You're missing the types for the parameters to Block(...).

ShadowByte Over a year ago

Isn't there a quicker way? I end up writing the same constructor all over again even though I don't want to change it.

Ehsan · Accepted Answer · 2014-02-20 12:25:40Z

0

you have multiple problems in your code. It should be like this

public Block(Vector2 nPos, float nRotation, Texture2D nTexture) : base(nPos,nRotation,nTexture) // see the way params are passed to the base constructor
{}

edited Feb 20, 2014 at 12:25

answered Feb 20, 2014 at 12:17

Ehsan

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5 Comments

ShadowByte Over a year ago

Are you all just saying "param1" just to be quick?

Ehsan Over a year ago

yes.I have updated my answer to remove the confusion.

ShadowByte Over a year ago

In your solution, I will have to end up typing all the constructor values when the base constructor does that already. Isn't there simpler way to refer the program to the base constructor?

Ehsan Over a year ago

you can call a parameter less constructor as well

ShadowByte Over a year ago

Thank you. I've tried this and it seems happy, but now the object isn't being drawn in XNA.

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