What Is an Action delegate?
Action delegate is an in-built generic type delegate. The Action delegate is generally used for those methods which do not contain any return value, or in other words, Action delegate is used with those methods whose return type is void. It can also contain parameters of the same type or of different types.
How func action and predicate delegates are different from each other?
Func is a delegate (pointer) to a method, that takes zero, one or more input parameters, and returns a value (or reference). Predicate is a special kind of Func often used for comparisons (takes a generic parameter and returns bool).
What is the difference between lambdas and delegates?
The difference really is that a lambda is a terse way to define a method inside of another expression, while a delegate is an actual object type.
Are delegates slow?
Having to get a delegate over an interface method (or virtual method, not sure) is really slow (compare the 5 seconds of getting an object as an interface to the almost 4 minutes of doing the same to get the action).
What is difference between action and function?
Let’s find it out! The difference between Func and Action is the return type of the method they point to. Action references a method with no return type. And, Func references a method with a return type.
Can we pass function as a parameter in C#?
We can pass a function as a parameter inside another function with the Func delegate. The following code example shows us how we can pass a function as a parameter inside another function with the Func<> delegate in C#. The Func<> delegate can only be used to pass the functions that return some value.
Are anonymous functions delegates?
As mentioned, delegates are reference types and are used to reference any method that has the same signature. In contrast to them, the anonymous functions are all about passing code block or code as a delegate parameter. Sometimes they are referred to as “anonymous delegates” too.
How do you pass a function in C#?
Pass a Function as a Parameter Inside Another Function With the Action<> Delegate in C. If we want to pass a function that does not return a value, we have to use the Action<> delegate in C#. The Action delegate works just like the function delegate; it is used to define a function with the T parameter.
When would you use delegates instead of interfaces?
When you access the method using delegates you do not require any access to the object of the class where the method is defined. When you access the method you need the object of the class which implemented an interface.