Question

C# Language

The ColourControl Class

• The class should be public.
• The class defines a read-only or private set public property named Value of type int.
• The class defines a public event named ValueChanged whose delegate type is void with two parameters, object sender and EventArgs e.
• The public constructor for the class is a default constructor (i.e., takes no parameters). The constructor sets the Value property to 128.
• The class defines a public void method named IncreaseValue. The method increases Value by 5. If after adding 5 the value is greater than 255, then Value should be set to 255 instead. The ValueChanged event should be raised only if the value has changed.
• The class defines a public void method named DecreaseValue. The method decreases Value by 5. If after subtracting 5 the value is less than 0, then Value should be set to 0 instead. The ValueChanged event should be raised only if the value has changed.
• The class defines a public void method named ResetValue. The method sets Value to 128. The ValueChanged event should be raised only if the value has changed.

Answer 1

using System;

public class ColourControl
{
  
//private readonly int Val;

public int Val { get; private set; }
  
// Constructor that takes no arguments:
public ColourControl()
{
Val=128;
}

  

public delegate void EventHandler();
  
  
public event EventHandler Valuechanged;
  
  

protected virtual void OnNumChanged()
{
if (Valuechanged != null)
{
Valuechanged();
}
else
{
Console.WriteLine("Event fired!");
}
}
  

public void Increasedvalue()
{
ColourControl c1=new ColourControl();
int k=c1.Val;
  
c1.Val=c1.Val+5;
  
if(c1.Val>255)
{
c1.Val=255;
}
  
if(k!=c1.Val)
{
OnNumChanged();
}
  
}
public void Decreasedvalue()
{
ColourControl c1=new ColourControl();
int k=c1.Val;
  
c1.Val=c1.Val-5;
  
if(c1.Val<0)
{
c1.Val=0;
}
  
if(k!=c1.Val)
{
OnNumChanged();
}
  
}

public void ResetValue()
{
ColourControl c1=new ColourControl();
int k=c1.Val;
c1.Val=128;
if(k!=c1.Val)
{
OnNumChanged();
}
  
}   
  
}