Скачать или смотреть Optional Parameters in C# (Part 29)

Optional Parameters with examples.

Notes from this video:

Optional parameters
____________________

Optional parameters allows us you define default values for method parameters so callers can omit them when invoking the method. This feature adds flexibility and reduces the need for method overloading.

Key Concepts
Optional parameters must be defined at the end of the parameter list.
Each optional parameter must have a default value.
We can use them in methods, constructors, indexers, and delegates.
Introduced in C# 4.0.

Example
public void Greet(string name, string greeting = "Hello")
{
Console.WriteLine($"{greeting}, {name}!");
}


Usage
Greet("Jyoti"); // Output: Hello, Jyoti!
Greet("Jyoti", "Welcome"); // Output: Welcome, Jyoti!


If we omit the optional parameter, the default value is used.
Default values must be compile-time constants, like numbers, strings, or null.