Csharp/CSharp Tutorial/Class/private

Define private constructors to make a singleton

<source lang="csharp">public class MyClass {

   static MyClass cache = null;
   static object cacheLock = new object();
   private MyClass()
   {
       // useful stuff here
   }
   
   public static MyClass GetMyClass()
   {
       lock(cacheLock)
       {
           if (cache == null)
           cache = new MyClass();
           
           return(cache);
       }
   }

}</source>

private static and const Fields

<source lang="csharp">using System;

   class MainClass
   {
       static void Main(string[] args)
       {
           MyTV tv = new MyTV();
       }
   }
   public class MyTV
   {
       public MyTV()
       {
           channel = 2;
       }
       private static int channel = 2;
       private const int maxChannels = 200;
   }</source>

Use Properties to get and set private member variable

<source lang="csharp">using System; class Circle{

   int radius;
   
   public int Radius{
       get{
           return(radius);
       }
       set{
           radius = value;
       }
   }

} class MainClass {

   public static void Main()
   {
       Circle c = new Circle();
       c.Radius = 35;
   }

}</source>

Using Methods to change private fields

<source lang="csharp">using System;

 class Class1
 {
   static void Main(string[] args)
   {
           MyCar car = new MyCar();
           int refChan = 0;
     int chan = 0;
           car.GetSpeed( chan );
           car.GetSpeed( ref refChan );
   }
 }
 public class MyCar
 {
       private static int speed = 2;
       private const int maxSpeed = 200;
       
       public bool ChangeSpeed(int newSpeed)
       {
           if( newSpeed > maxSpeed )
               return false;
           speed = newSpeed;
           return true;
       }
       public void GetSpeed( int param )
       {
           param = speed;
       }
       public void GetSpeed( ref int param )
       {
           param = speed;
       }
 }</source>