static void Main(string[] args)
{
CallBackFunc(CallPrint, "Hello"); //함수 연결
CallBackFunc(delegate(string str) { Console.WriteLine(str); }, "Hello"); //delegate 직접
CallBackFunc((string str) => { Console.WriteLine(str); }, "Hello"); //람다의 식형태
CallBackFunc((str) => Console.WriteLine(str), "Hello"); //람다식 기본..
CallBackFunc(str => Console.WriteLine(str), "Hello");
dFunc dfunc = () => Console.WriteLine("No Params"); //파라미터가 없는 경우 () 반드시 사용
}
static void Main(string[] args)
{
CallBackFunc(CallPrint, "Hello"); //함수 연결
CallBackFunc(delegate(string str) { Console.WriteLine(str); }, "Hello");
CallBackFunc((string str) => { Console.WriteLine(str); }, "Hello");
CallBackFunc((str) => { Console.WriteLine(str); }, "Hello");
CallBackFunc(str => Console.WriteLine(str), "Hello"); // 가장 심플해서 많이 쓰임
dFunc dfunc = () => Console.WriteLine("No Params"); // 파라미터가 없으면 ()를 써야함
}
public static void TestFunctionExpression()
{
Assert.AreEqual(2, mFunc());
Assert.AreEqual(9, aFunc(3));
dFunc func = new dFunc(Area);
Console.WriteLine(func(4));
dFunc circumference = new dFunc(delegate(int r) { return(6 * r); });
Assert.AreEqual(30, circumference(5));
dFunc circ = r => 6 * r;
Assert.AreEqual(48, circ(8));
Func <double, double> f = r => 6 * r;
Assert.AreEqual(54, f(9));
int ai(int _x) => _x + 1;
Assert.AreEqual(6, ai(5));
// Action<int> a = ai;
// Assert.AreEqual(6, a(5));
Action av = () => Console.WriteLine("av");
av();
Predicate <int> p = _x => _x == 3;
Assert.False(p(4));
int x = 3, y = 4;
BinaryExpression b1 = Expression.MakeBinary(ExpressionType.Add,
Expression.Constant(1), Expression.Constant(2));
BinaryExpression b2 = Expression.MakeBinary(ExpressionType.Add,
Expression.Constant(x), Expression.Constant(y));
BinaryExpression b3 = Expression.MakeBinary(ExpressionType.Subtract, b1, b2);
int result = Expression.Lambda <Func <int> >(b3).Compile()();
Assert.AreEqual(-4, result); // 3-7
}