Question

C# newbie here.

In one of my classes (an Entity class, to be precise), I have a delegate that takes in an Entity and another related class:

public delegate void FiringFunc(Entity e, BulletFactory fact)

and a loop in the Entity class that calls this function every frame (if its defined):

FiringFunc firingFunc = null; //defined later
if(firingFunc)
    firingFunc(this, someBulletFactory);    

As one could probably tell, this is a delegate that serves as a bullet firing function (you would code something like a timer for the bullet, the angles to fire at, etc). However, a thought occurred to me: what if I wanted the bullet to have a slight difference, but still remain the same (something like a tad bit slower, a slightly different color, in a different direction, etc). I would have to create another function to serve as the delegate – this seemed wrong to me.

Here is an example of what creating and setting the delegate would look like:

Entity e = new Entity( ... )
e.firingFunc = FiringFunctions.SomeFiringFunctionName;

Is there a way I could add parameters to this? It would be great if I could do something akin to the following:

e.firingFunc = FiringFunctions.SomeFiringFunctionName(someChange1, someChange2);

Answer 1

Try

e.firingFunc = 
    (Entity e, BulletFactory fact) => 
        FiringFunctions.SomeFiringFunctionName(e, fact, "foo", 5);

This creates a new anonymous function (the lambda) that calls FiringFunctions.SomeFiringFunctionName with the included parameters.

This assumes that FiringFunctions.SomeFiringFunctionName is defined as:

public void SomeFiringFunctionName(Entity e, BulletFactory fact, String someString, Int32 someInt) { 
  //...  do whatever here
}