New to C#, how can I create a method that will accept a method as one of its parameters?
Sounds little weird but I hope that it will be supported in c#.
That what I tried:
public void CalculateRepairedCars(int total, /*here I want to pass a method..*/) { ... } This is the method which I would like to pass:
public int Calculate{int totalCars, Condition condition} { ... } "Putting a method inside a value" (which you can then do many things with, such as passing as an argument to another method) in C# is called creating a delegate to that method.
A delegate has a type that directly corresponds to the signature of the method it points to (i.e. the number and types of its arguments and the return value). C# offers ready-made types for delegates that do not return a value (Action and its siblings) and for those that do (Func and its siblings).
In your case, the signature of Calculate matches the type Func<int, Condition, int> so you would write
public void CalculateRepairedCars(int total, Func<int, Condition, int> calc) { // when you want to invoke the delegate: int result = calc(someCondition, someInteger); } and use it like
CalculateRepairedCars(i, Calculate); 
Func<int, Condition, int> f = Calculate. Only the variable doesn't really need to exist; see how I am passing Calculate to the method without defining a variable first. I hope that helps :)f is not a variable?CalculateRepairedCars. Inside CalculateRepairedCars, calc is a variable of delegate type.There are multiple ways. I've used an Action to do it before.
private void SomeMethod() { CalculateRepairedCars(100, YetAnotherMethod); } public void CalculateRepairedCars(int total, Action action) { action.Invoke(); // execute the method, in this case "YetAnotherMethod" } public void YetAnotherMethod() { // do stuff } If the method being passed as a parameter has parameters itself, (such as YetAnotherMethod(int param1)), you'd pass it in using Action<T>:
CalculateRepairedCars(100, () => YetAnotherMethod(0)); In my case, I didn't have to return a value from the method passed as a parameter. If you have to return a value, use Func and its related overloads.
Just saw you updated your code with the method you're calling.
public int Calculate(int totalCars, Condition condition) { ... } To return a value, you'd need Func:
public void CalculateRepairedCars(int total, Func<int, string, int> func) { var result = func.Invoke(total, someCondition); // where's "condition" coming from? // do something with result since you're not returning it from this method } Then call it similar to before:
CalculateRepairedCars(100, Calculate); The c# method type is called delegate. You declare it, assign a method and then you can do many things with it including passing it as a parameter. Look it up! Note: delegates are sort of type safe in that the must share the signature with the methods they point to.
FuncandActionclasses.