public static void Foo()
{
BinaryOperation add = Add;
BinaryOperationG <int> add2 = Add;
BinaryOperation sub = Sub;
int addRes = add(0, 5); // 5
int subRes = sub.Invoke(1, 4); // -3
Action <int> a1 = WriteHello;
a1 += WriteHowYouDo;
Predicate <int> p1 = PositiveNumber;
Func <int, string> f1 = NumberStr;
Func <string> f2 = DateStr;
Func <int, int, int> f3 = Add;
a1?.Invoke(1); // void, write in console
bool p1r = p1(123); // true
string f1r = f1(6); // "6"
string f2r = f2(); // 2020 12 16
Func <int, string> f4 = delegate(int a)
{
return(a.ToString());
};
Func <int, string> f5 = (a) => a.ToString();
try
{
Func <int, int, int> f44 = null;
//var d1 = f44(4, 5);
var d2 = f44?.Invoke(4, 5);
}
catch (NullReferenceException e)
{
var message = e.Message;
}
}
private void previewButton_Click(object sender, EventArgs e)
{
EnableControls(false);
previewPictureBox.Image = operation.Invoke(sourceImage, overlayImage);
EnableControls(true);
}
public static double InvokeBinary(BinaryOperation binaryOperation, double num1, double num2)
{
double ans = Round(binaryOperation.Invoke(num1, num2), DigitsLimit);
return(ans);
}
