static void delegates()
{
//declaring a delegate
printFormats1 handler1 = new printFormats1(format1);
//adding method references to delegate1
handler1 += format2;
handler1 += format3;
handler1 += format4;
handler1 += format5;
//invoking methods
handler1(10);
//deleting methods from a delegate instance
handler1 -= format3;
handler1 -= format4;
handler1 -= format5;
//other way to instance a delegate
printFormats2 handler2 = format3;
handler2 += format4;
handler2 += format5;
//anoter way to invoke methods
handler2.Invoke(30);
}
static void AnonymusMethod()
{
Action writeTitle = delegate()
{
Console.WriteLine("The Main Title");
};
writeTitle();
Func <int, string> Num2Text = delegate(int number)
{
switch (number)
{
case 1:
return("one");
case 2:
return("two");
case 3:
return("three");
default:
return("it is not in the list");
}
};
Predicate <string> IsNumber = delegate(string s)
{
int i;
float f;
return(int.TryParse(s, out i) || float.TryParse(s, out f) ? true : false);
};
Console.Write("Write a number(1-4):");
string value = Console.ReadLine();
if (IsNumber(value))
{
Console.WriteLine("The Text of the number {0} is : {1}", value, Num2Text(int.Parse(value)));
}
printFormats1 format = delegate(int i)
{
format1(i);
};
format(int.Parse(value));
anonymus(delegate() {
Console.WriteLine("This is anonymus method as a parameter");
});
}
