I am unable to understand a piece of code I read. could anyone help me understand it

Question

I came across a code, which is bit confusing for me. In the below code, isVisible is not declared, still it is able to assign value to the delegate.

Action<bool> onChangeLoader = (isVisible) => { };

You've created an anonymous method (return type: void) which accepts a bool and does nothing. You've then stored that method as a delegate in `onChangeLoader`. `isVisible` is a bool as inferred from `Action`. — ProgrammingLlama, Oct 14 '22 at 07:21
1) [Delegates in C#](https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/delegates/) 2) [Lambdas in C#](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/lambda-expressions) 3) [Delegates with Named vs Anonymous Methods](https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/delegates/delegates-with-named-vs-anonymous-methods) — ProgrammingLlama, Oct 14 '22 at 07:22
Action onChangeLoader means is that onChangeLoader is a method pointer and this method has a parameter in type bool. ( isVisible ) => this is an anonim method decleration. isVisible type come from left part of equal — Ramin Quliyev, Oct 14 '22 at 07:26

score 1 · Answer 1 · answered Oct 14 '22 at 07:23

That code is equivalent to having this method:

private void DoSomething(bool isVisible)
{

}

and then assigning a delegate for that method to a variable:

Action<bool> onChangeLoader = DoSomething;

After that, anywhere that you might call the DoSomething method, you could invoke the onChangeLoader delegate.

1 Answers1