Behind the Scenes Look at C#: Properties - Modifying the Worker Class

(Page 4 of 4 )

Let's modify our Worker class to utilize properties instead of the Getxxx/Setxxx methods.

using System;
namespace Properties
{
class Class1
{
static void Main(string[] args)
{
try
{
Worker worker1 = new Worker();
Console.WriteLine("Enter Your First Name");
worker1.FirstName = Console.ReadLine();
Console.WriteLine("Enter Your Last Name");
worker1.LastName = Console.ReadLine();
Console.WriteLine("Enter Your Department");
worker1.Department = Console.ReadLine();
Console.WriteLine("Enter Your Age");
worker1.Age = Convert.ToInt32(Console.ReadLine());

Console.WriteLine(worker1);
Console.ReadLine();
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
Console.ReadLine();
}
}
}

public class Worker
{
private string firstName;
private string lastName;
private string department;
private int age;


public string FirstName
{
get
{
return this.firstName;
}

set
{
if(value == String.Empty)
{
throw new ArgumentNullException();
}
else
{
this.firstName = value;
}
}
}

public string LastName
{
get
{
return this.lastName;
}

set
{
if(value == String.Empty)
{
throw new ArgumentNullException();
}
else
{
this.lastName = value;
}
}
}

public string Department
{
get
{
return this.department;
}

set
{
switch(value)
{
case "IT":
this.department = "IT";
break;
case "HR":
this.department = "HR";
break;
case "Sales":
this.department = "Sales";
break;
default:
throw new ArgumentException("invalid department");
}
}
}

public int Age
{
get
{
return this.age;
}

set
{
if(value > 18 && value < 40)
{
this.age = value;
}
else
{
throw new ArgumentException("The worker can't be over 40");
}
}
}

public override string ToString()
{
return firstName +" "+lastName+" is working in "+department+
" and he's "+age+" years old";
}

}
}

The result of running this code will be the same:

As you can see, we still do our data validation and throw exceptions from inside the set part of the properties. Let's take a look at the MSIL of this application. Load the file with the Ildasm.exe and navigate to the class Worker.

get_Age, get_Department and set_Age and set_Department? Yes, the C# compiler generates those methods as the Getxxx and Setxxx methods. In the next part of this article, we will discuss the MSIL Generated code of C# Properties, static properties, read-only properties and more. 

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