C# 05: Methods

How to use methods in C#.

Void Method

A void method returns nothing. Syntax: {access modifier} {return type} {method name}( {parameters} );

For example:

private void DisplayMessage()
{
    MessageBox.Show("Display a Message");
}

// Method Call 
DisplayMessage();

Value Methods

A value-returning method returns a value to the statement that called it. Syntax:

{access modifier} {data type} {method name}( {parameters} )
{
    statement;
    return expression;
}

For example:

private int summation (int val1, int val2, int defaultVal = 0) // multiple arguments, default
{
    return defaultVal + val1 + val2; // Named arguments
}

Parameters

Parameters mostly act like constants within the scope of the method.

Reference Parameters

Reference parameters act like variables, in that they can be modified within a method.

private void zeros(ref int number)
{
    number = 0;
}

or

int myNumber = 9;
private void zeroz(ref myNumber)
{
    myNumber -= 2;
}

Output Parameter

An output parameter is like a reference parameter but returns the variable.

private void zeroed(out int number)
{
    myNumber = 0;
}

int number;
zeroed(out number)

QED

© Adam Heinz

6 November 2024