Local Function in C#
The local function feature is introduced in C# 7.0. It allows you to declare a method inside the body of an already defined method. Or in other words, we can say that a local function is a private function of a function whose scope is limited to that function in which it is created. The type of local function is similar to the type of function in which it is defined. You can only call the local function from their container members.
- Local functions are declared inside methods, constructors, property accessors, event accessors, anonymous methods, lambda expressions, finalizers, and other local functions.
- You cannot declare a local function in the expression-bodied member.
- Local function makes your program more readable and also save you from mistakenly call method because you cannot call a local function directly.
- In local function, you are allowed to use async and unsafe modifiers.
- Local function can access the local variables that are defined inside the container method including method parameters.
- You are not allowed to use any member access modifiers in the local function definition, including private keyword because they are by default private and you are not allowed to make them public.
- You are also not allowed to use static keyword with local function.
- You are also not allowed to apply attributes to the local function, or to its parameters, or to its parameter type.
- Multiple local functions are allowed.
- Overloading is not allowed for local functions.
Value of a is: 20 Value of b is: 40 Sum of a and b is: 60 Value of a is: 40 Value of b is: 60 Sum of a and b is: 100
Value of a is: 50 Value of b is: 80 Value of x is: 40 Value of y is: 60 Sum: 230 Value of a is: 79 Value of b is: 70 Value of x is: 40 Value of y is: 60 Sum: 249
Advantages of local function:
- You are allowed to create local generic functions.
Value is: 123 Value is: GeeksforGeeks Value is: G Value is: 45453.5656
- You are allowed to pass out/ref parameters in local functions.
- You are allowed to use params in local functions.
Geeks gfg GeeksforGeeks 123geeks