public void RemoveEventListener(string eventId, NormalDelegate func)
{
if (eventDic.ContainsKey(eventId))
{
eventDic[eventId] -= func;
}
}
public static void GenericDelegateDemo()
{
var oldSchoolDelegate = new NormalDelegate(GenericDelegates.Multiply);
oldSchoolDelegate.Invoke(5, 6);
oldSchoolDelegate(3, 4);
var oldSchoolDelegateWithAnonymousMethod = new NormalDelegate(delegate(int a, int b) { return(a * b); });
oldSchoolDelegateWithAnonymousMethod(7, 8);
var delegateWithLambdaExpression = new NormalDelegate((a, b) => a * b);
//var delegateWithDirectLambdaExpression = (a, b) => a * b; Can not assign lambda expression to implicitly typed variable
// Can be assigned to Generic Delegates.
// takes input parameter and returns value
Func <int, int, int> sumFunc = (a, b) => a + b;
// takes only input params. No output.
Action <int, int> sumPrintAction = (a, b) => { Console.WriteLine($"from sumPrintAction : { a + b}"); };
// takes one input and returns boolean
Predicate <int> isEvenPredicate = n => n % 2 == 0;
var sum = sumFunc(5, 6);
Console.WriteLine($"sumFunc result : {sum}");
sumPrintAction(7, 8);
var n = 9;
Console.WriteLine($"Is Number({n}) even : {(isEvenPredicate(n) ? "YES" : "NO")} .");
}
public void AddEventListener(string eventId, NormalDelegate func)
{
if (eventDic.ContainsKey(eventId))
{
eventDic[eventId] += func;
}
else
{
eventDic[eventId] = func;
}
}
