Predicate Delegates in C#

Question

Can you explain to me:

• What is a Predicate Delegate?
• Where should we use predicates?
• Any best practices when using predicates?

Answer 1

Simply -> they provide True/False values based on condition mostly used for querying. mostly used with delegates

consider example of list

List blabla= new List();
        blabla.Add(new Program("shubham", 1));
        blabla.Add(new Program("google", 3));
        blabla.Add(new Program("world",5));
        blabla.Add(new Program("hello", 5));
        blabla.Add(new Program("bye", 2));

contains names and ages. Now say we want to find names on condition So I Will use,

    Predicate test = delegate (Program p) { return p.age > 3; };
        List matches = blabla.FindAll(test);
        Action print = Console.WriteLine;
        matches.ForEach(print);

tried to Keep it Simple!