Add a class Customer.cs
and write the following code:
using System;
namespace oopsProject
{
public enum cities {
public class Customer
{
int _custid;
string
_cname, _state;
double
_balance;
bool
_status;
cities
_city;
public
Customer(int _custid)
{
this._custid
= _custid;
//Get all other values from DB basing on given ID:
_cname = "prabhu";
_balance = 5000;
_status = false ;
_city = 0;
_state = "karnataka";
Country = "
}
//Read only Property
public int Custid
{
get { return _custid; }
}
//Read write Property
public string Cname
{
get { return _cname; }
set {
_cname = value; }
}
//Read write Property
public bool Status
{
get { return _status; }
set {
_status= value; }
}
//Read write Property with a condition
public double Balance
{
get
{
if
(_status)
return _balance;
else return 0;
}
set
{
if (value >= 500)
_balance = value;
}
}
// enumerated property
public cities city
{
get{return _city;}
set{_city = value;}
}
// setting scope of property Accessor independently (2.0)
public string state
{
get { return _state;}
protected
set { _state = value;}
}
//Automatic Properties 3.0
public
string Country
{
get;
private
set;
}
}
}
|
Enumerated Property – These are property which is defined with a list of
constants to choose from. to define these type of properties first we need to
declare all the constants under a type known as “enum” .An enum is a collection
of constants, which should be declared as following.
Syntax –
|
[<modifiers>] enum
<name> {<list of values >};
|
Eg:-
|
public enum Days {Monday, Tuesday, Wednesday, Thursday,
Friday};
|
If this enum is used as a type for any property we call it as
enumerated property.
-
Declaring a variable of enum type|
Days weekday = 0;
or
Days weekday = Days.Wednesday ;
|
|
public Days weekday
{
get {return weekday;}
set { weekday = value;}
}
|
New Features to
Properties:-
<!--[if
!supportLists]-->
<!--[endif]-->In C# 2.0, there are given an option to
define a property setting the scope of each property Accessor independently.
Eg: State property we have defined under customer class.
<!--[if
!supportLists]-->
<!--[endif]-->In C# 3.0, we were given with an option
automatic properties, which allows us to define a property without any variable
declaration for the property, So set and get blocks doesn’t contain any code in
them, but it is must to define both get and set blocks.
Eg: Country Property in above customer class.
Consuming the
Properties:-
-
Add a class TestCustomer.cs and write the following|
using System;
namespace oopsProject
{
class TestCustomer
{
static void
{
Customer obj = new Customer(101);
Console.WriteLine(obj.Custid);
//Assignment i not possible as property is read only
//obj.Custid = 102;
Console.WriteLine(obj.Cname);
obj.Cname = "xyz";
Console.WriteLine(obj.Cname);
Console.WriteLine(obj.Status
);
//Balance will be zero here as status is inactive
Console.WriteLine(obj.Balance);
obj.Status = true;
Console.WriteLine(obj.Status);
// now it returns balance as status is active
Console.WriteLine(obj.Balance);
obj.Balance = 400; //assignment fails
// here as it is less than 500
obj.Balance = 400;
Console.WriteLine(obj.Balance);
// assignment succeeds as it is greater than 500
obj.Balance = 600;
Console.WriteLine(obj.Balance);
Console.WriteLine(obj.city);
obj.city = cities.Hyderabad;
Console.WriteLine(obj.city);
Console.WriteLine(obj.state);
// Assigning value to the property is invalid as current
//class is not a child class of customer
//obj.state = "AP";
Console.WriteLine(obj.Country);
Console.ReadLine();
}
}
}
|
Note – Just like we have Abstract method and
Virtual method, we can define Property also as abstract and virtual. So that we
can override them under Child class.
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