Game Development
using and namespace
Learn the using directive and the namespace concept.
The namespace Concept
In C#, namespaces (namespace) are used to group related classes into a logical collection and prevent naming conflicts. In large projects or libraries, two classes might share the same name. Using namespaces, we place classes under their own dedicated packages to distinguish them.
namespace OyunSistemi
{
public class Dusman { }
}
All core game classes provided by Unity reside inside the UnityEngine namespace.
The using Directive
To use classes from a namespace without typing their full paths every time, the using directive is added at the very top of the file. For example, when you write using UnityEngine;, you can type GameObject instead of UnityEngine.GameObject. For standard C# libraries, using System; is included.
using System;
using UnityEngine;
public class Karakter : MonoBehaviour
{
}
Missing using directives cause compiler errors because the compiler cannot locate the referenced classes.
Exercise Include namespace with using
At the top of the file, write the using directive to include the System namespace. Inside the Main method, print "using System basarili!" using Console.WriteLine.
Show example solution
using System;
public class Program
{
public static void Main()
{
Console.WriteLine("using System basarili!");
}
}
Test yourself
-
What is the primary purpose of using a namespace in C#?
- To logically group classes and avoid name collisions
- To speed up lighting calculations in the scene
- To allow code to run directly without compilation
- To automatically set the game's screen resolution
Show answer
To logically group classes and avoid name collisions — Namespaces categorize classes and prevent identically named classes across different libraries from colliding.
-
Importing Unity namespace
using ____;
Show answer
using UnityEngine;
-
using and namespace matching
- using
- Adds the specified namespace to the file
- namespace
- Namespace block that groups classes
- UnityEngine
- Namespace with Unity engine classes
- System
- Namespace with standard C# libraries
Next lesson: Class structure
