Can We Create Method Inside Method In C#?

When writing code in C# or learning about methods in programming, you may be wondering if we can create a method inside another method in C#. In this blog, I discuss how we can create a method inside another method in a C# program.

Introduction

Creating a method inside another method is called local functions in C#.

Using a method inside another method makes code easier to read. Local functions is just like lamda expressions.
Local function is a private method.
We can declare local functions inside methods, constructors, anonymous methods, lambda expressions and other local functions.
We can write a local function as generic.
We can use out and ref parameters in location functions.
We can use params in local functions.
We can create multiple local functions inside a method.
Local functions do not allow access modifiers

Local Function Syntax

<modifiers> <return-type> <method-name> <parameter-list>

Example 1: Multiple Local Functions

Below example provides information has to ow we can create multiple local functions. Here the Main is the method and inside that we have created Sum, Sub, Mul local functions.

using System;
namespace LocalFunctions
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine($"Sum: {Sum(10, 20)}");
Console.WriteLine($"Sub: {Sub(10, 20)}");
Console.WriteLine($"Mul: {Mul(10, 20)}");
Console.WriteLine($"Sum: {Sum(5, 15)}");
int Sum(int a, int b)
{
return a + b;
}
int Sub(int a, int b)
{
return a - b;
}
int Mul(int a, int b)
{
return a * b;
}
Console.ReadKey();
}
}
}

Output

Sum: 30
Sub: -10
Mul: 200
Sum: 20

Example 1 - Generic Local Functions