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I thought this was a great concept; a method that is activated from the constructor when the object is created and in the method, see code below, after 3 seconds call another object to remove it from a list, but unfortunately this isn't working the way I want! There seems to be some problems with the timer, because the call to remove the object is done immediately without any delay! Have I missed something or isn't this possible? Perhaps in another way?

public void ExplosionTimer(GameTime gameTime)
        seconds += (float)gameTime.ElapsedGameTime.TotalSeconds;
        if (seconds > 3)
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Why not just handle this in the object's Update()? Seems pointless to add another thread and have to worry about sync, etc when the functionality is already there. – David Lively Jul 23 '12 at 20:03
up vote 1 down vote accepted

What does the method activated from the constructor do? Allow the gameobject to be explodable? Are you setting seconds = 0 in the constructor? What does objectManager.ExplosionControl() do? Loop over all objects and find the ones with seconds > 3? If so, why don't you just pass the object itself and ask it to be removed from the list?

objectManager.removeExplodedObject( this ); // for example

What you are describing should work. Are you calling ExplosionTimer on each update?

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Thanks! Each object have there own update method and when I made a call to the ExplosionTimer from the update, then it worked like I wanted! – 3D-kreativ Jul 22 '12 at 15:01
I'm just a little bit confused how the GameTime object works!? Does the seconds variable start to count the first time the ExplosionTimer is called? – 3D-kreativ Jul 22 '12 at 15:07

Not exactly an answer to you problem but simply an alternative to your timer logic. You could also define a field that stores the time in the future when you want to trigger your behaviour.

The following example will cause damage & trigger a particle effect every half second regardles if this method is called more often than that period.

  private double _particleTimeSpan;

  public override void OnHurt(Vector2 location, float amount, DamageTypeEnum type, Actor cause, GameTime gameTime)
    if (_particleTimeSpan < gameTime.ElapsedGameTime.TotalSeconds)
         Health -= amount;
        _particleTimeSpan = gameTime.ElapsedGameTime.TotalSeconds + 0.5;
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