Casting signal arguments in C#

BriarSMC

In my Player class I want to respond to the "body_entered" signal from an Area2D when Player collides with Class Enemy. Then I want to reference a property in the Enemy body we collided with. I cannot figure out how to recast the BodyEnterered signal.
hurtBox.BodyEntered += OnHurtBoxBodyEntered; // In _Ready()
private void OnHurtBoxBodyEntered(Node2D body) { Enemy e = (Enemy) body; if(body.IsInGroup("Enemy")) { GD.Print("Player Body Entered by " + body.Name); HealthManager.DecreaseHealth(e.DamageAmount); HealthManager.DecreaseHealth(body.DamageAmount); }

The body.DamageAmount throws VSCode/compiler error:

'Node2D' does not contain a definition for 'DamageAmount' and no accessible extension method 'DamageAmount' accepting a first argument of type 'Node2D' could be found (are you missing a using directive or an assembly reference?)'

I tried (Enemy body) in the function definition, but it didn't like that either. What do I have to recast so I can use the body.DamageAmount reference?

kuligs2

BriarSMC your code is incomplete, also format it using tags at the top and bottom ```

that .DamageAmmount does not exist in the Enema class. thats why you get error.

you could try to do this - pseudo code

do not cast the body in OnHurtBoxBodyEntered(Node2D body) as type

func on_baddy_entraed(baddy):

   var enema : Enema = baddy

   #do the baddy thing
   HumanResources.manage(enama.DMg)

trizZzle

BriarSMC

This is how I usually do it:

public partial class DamageArea : Area3D
{
    [Export]
    public int Damage { get; private set; }

    public override void _Ready()
    {
        BodyEntered += OnBodyEntered;
    }

    public void OnBodyEntered(Node3D body)
    {
        if (body is Character) // Character is my class that extends CharacterBody3D that has a health component
        {
            GD.Print(body);
            Character character = (Character)body;
            character.Health.TakeDamage(Damage);
        }
    }
}

CakeCadaver

mmmm that's a gdscript response to a c# question.

If you have .DamageAmount already added to the Enemy class, then the editor is saying its reading body as a reference to the Node2D instead of a reference to the script or class Enemy. In c#, Make sure damageAmount is marked as public and initialized to some amount, like

public int DamageAmount = 0;

e here is the body recast to the class enemy and should be the variable you want. e and body are the same object, but e is a reference to the enemy class and has the damage amount variable, and body is a reference to the node2D class on the same object, and therefore does not have that variable. e.DamageAmount is the variable you want.

Does the line HealthManager.DecreaseHealth(e.DamageAmount) work? Can you print e.DamageAmount? That line should work, and calling it again would just be calling the same function twice with the same variable. If e.damageAmount is not working, try putting Enemy e = (Enemy) body inside the group check. Or you could simplify it to

if(body.IsInGroup("Enemy")) { GD.Print((Enemy)body.DamageAmount); HealthManager.Decreasehealth((Enemy)body.DamageAmount); }