In which scenarios, Func to use in c#?

Question

As real time example, in which scenarios, Func can be used. What exactly Func does in C#?. Could you please explain with example?

Vulpes · Answer

Func is a delegate which can represent any method which takes no parameters but returns a value of type T. For example: using System; class Test { static void Main() { Func func = GetGreeting; // no parameters but returns a string Console.WriteLine(func()); Console.ReadKey(); } static string GetGreeting() { return "Hello Jitendra :)"; } }

Vulpes · Answer

Well, there are several reasons why you might want to use a delegate in 'real world' programming: 1. If you want to pass a method as an argument to another method. 2. If you want a method to return another method. 3. If you want to call more than one method at once. Bearing in mind that lambda expressions can be automatically converted to compatible delegates, #1 is particularly useful in LINQ as it allows you to write code 'inline' rather than creating separate methods. Delegates are also the basis for events in .NET. The latter are just a special kind of delegate where the only operations allowed outside the class in which the event is defined are += and -= which respectively add an event-handler to or remove an event-handler from the delegate's invocation list. Here's another example which illustrates #1: using System; class Test { static void Main() { Func func = GetGreeting; MyMethod(func); // now call with a lambda expression MyMethod(()=> "Hello Hemant :)"); Console.ReadKey(); } static string GetGreeting() { return "Hello Jitendra :)"; } static void MyMethod(Func func) { Console.WriteLine(func()); } }

Hemant Mehra · Answer

Sir, why we use delegate Func there...we have another way to get string value from GetGreeting(). like :- using System; class Test { static void Main() { string func = GetGreeting; // no parameters but returns a string Console.WriteLine(func()); Console.ReadKey(); } static string GetGreeting() { return "Hello Jitendra :)"; } } Can you clear me. thanks in advance.

In which scenarios, Func<T> to use in c#?

Answers (3)