C# Functions

Updated June 16, 2023

Introduction to C# Functions

C# functions are the essential parts of the C# program that can consist of several elements, such as the function name that is used as the function’s reference, return types of the data operated in the functions, the logical body of the function, parameters that can be passed as arguments for the function, and the Access Specifier for defining the accessibility of the function inside the program. The different functions that can be integrated into a C# program are a combination of functions with or without parameters, which can or cannot have the return values, depending on the requirement provided.

There are several components in functions –

• We have a unique name called the Function name to make a function call.
• We will use the Return Type to specify the return value data type.
• The block of statements that contains the executable statements is called Body.
• We can pass the functions during the function call as a list of Parameter arguments.
• To specify the accessibility of function in the application, we can use the Access specifier.

Different C# Function

• Without parameters(arguments) and return type.
• With parameters(arguments) but without return type.
• Using parameters(arguments) and with the return type.
• Without parameters(arguments) and with the return value.

C# Function Syntax

<access-specifier><return-type>FunctionName(<parameters>)
{
// function body
// return statement
}

Return statements, parameters, and Access-specifier are optional in the above syntax.

If a function’s return value is “void,” it cannot return any values to the calling function.

1. Using Without Parameters and Without Return Type

We specified the function with no parameter and no return type, a function that does not return any values here, as void type as a return type value. In this program, any values should not be passed to the function call Display(), and also, there are no values that are returned from this function call to the main function.

Let’s see the example with a function build without a return type and parameter,

Example:

Code:

using System;
namespace FunctionSamples
{
class Program_A
{
// User defined function without return type and parameter
public void Display()
{
Console.WriteLine("Non Parameterized Function"); // No return statement
}
static void Main(string[] args) // Main Program
{
Program_A program = new Program_A (); // to create a new Object
program.Display(); // Call the Function
}
}
}

Output:

2. Using With Parameters (Arguments) and Without Return Type

In this program, a string is passed as a parameter to the function. This function’s return type is “void,” and no values can be returned. The value of the string is manipulated and displayed inside the function itself.

Example:

Code:

using System;
namespace FunctionSample
{
class Program_B
{
public void Display(string value) // User defined function without return type
{
Console.WriteLine("Hello " + value); // No return statement
}
static void Main(string[] args) // Main function
{
Program_B program = new Program_B(); // Creating Objec
program.Display("Welcome to C# Functions"); // Calling Function
}
}
}

Output:

3. Using With Parameters (Arguments) and with Return Type

In this program, a string is passed as a parameter to the function. The return type of this function is “string,” and the return value of the string can be returned from the function. The value of the string is manipulated and displayed inside the function itself.

Example

Code:

using System;
namespace FunctionsSample
{
class Program_C
{
// User defined function
public string Show(string message)
{
Console.WriteLine("Inside the Show Function Call");
return message;
}
// Main function
static void Main(string[] args)
{
Program_C program = new Program_C();
string message = program.Show("C# Functions");
Console.WriteLine("Hello "+message);
}
}
}

Output:

4. Using Without Parameters (Arguments) and with Return Value

In this program, arguments or parameters will not be passed to the function “calculate” but to the main function; the values are returned from this calculate () function call. The variables a and b values are calculated in the function called “calculate,” and in the main function, the sum of these values is returned as a result.

Example:

Code:

using System;
namespace FunctionsSample
{
class Program_D
{
public void calculate()
{
int a = 50, b = 80, sum;
sum = a + b;
Console.WriteLine("Calculating the given to values: " +sum);
}
static void Main(string[] args) // Main function
{
Program_D addition =new Program_D();
addition.calculate();
}
}
}

Output:

C# Passing Parameters to Methods

When creating a method with arguments/parameters in c#, we must pass arguments/parameters to that specified method when calling our application’s function. We have several ways to pass parameters to the method; let’s see the parameters/arguments.

Conclusion – C# Functions

In this article, we well-read the usage of the functions/ methods available in C# and learned the different C# functions. I hope this article has helped you understand the several functional aspects of C#.

Recommended Articles

This has been a guide to C# Functions. Here we discussed the basic concepts and different types of C# functions with their syntax for better understanding. You can also go through our other suggested articles to learn more –

1. C# String Functions
2. C# Commands
3. Uses Of C#
4. C# vs Java Performance