What's the significant of private construtor ?
public class Car{
private string m_strName;
private string m_strType;
private int m_nID;
private Car(string name, string type, int ID)
{
m_strName = name;
m_strType = type;
m_nID = ID;
}
public static string Name
{
get
{
return m_strName;
}
}
}
I intended to create an enumeration class similar to Color
class in .NET framework.
Color mycolor = Color.Blue;
How should I modify the class above to make the following
works ?
Car car = car.NISSAN;
Thanks in advance. 6 1610
Hi, What's the significant of private construtor ?
public class Car{ private string m_strName; private string m_strType; private int m_nID;
private Car(string name, string type, int ID) { m_strName = name; m_strType = type; m_nID = ID; }
public static string Name { get { return m_strName; } } }
I intended to create an enumeration class similar to Color class in .NET framework.
Color mycolor = Color.Blue;
How should I modify the class above to make the following works ?
Car car = car.NISSAN;
???
I hope you mind:
Car car = Car.NISSAN;
Add this sample to code of your class, to accomplish your needs:
public readonly static NISSAN = new Car("Nissan"
, "small"
, 1);
Regards
Marcin
A private constructor will prevent anyone (outside the class) from
instantiating that class
Car c = new Car(name, type, ID); // won't work outside the class
Car c = new Car(); // won't exist, since you have another constructor
if you add
public static Car Nissan
{
get
{
return new Car("Nissan", type, ID);
}
}
to get Car c = Car.Nissan; to work;
Happy coding!
Morten
--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
> Add this sample to code of your class, to accomplish your needs:
my fault :)
public readonly static Car NISSAN = new Car("Nissan"
, "small"
, 1);
Marcin
Hi
Check this out about the need for private constructors http://msdn.microsoft.com/library/de...onstructors.as
For your next question, how to do instantiation like the one below
Car car = car.NISSAN
I guess you can do this using Implicit operator overloading. check the below link for the same http://msdn.microsoft.com/library/de...lrfimplicit.as
Hope this helps..
Regards
Madh
MVP | MCSD.NE
----- Q2004 wrote: ----
What's the significant of private construtor
public class Car
private string m_strName
private string m_strType
private int m_nID
private Car(string name, string type, int ID
m_strName = name
m_strType = type
m_nID = ID
public static string Nam
get
return m_strName;
I intended to create an enumeration class similar to Color
class in .NET framework.
Color mycolor = Color.Blue
How should I modify the class above to make the following
works
Car car = car.NISSAN
Thanks in advance
Actually, you wouldn't want a new car for every time you call Car.Nissan,
so you might want to create them in advance and just return the reference
for Nissan. This is how the Color class works, by returning a Color when
calling the Blue/Green/Salmon... properties of the class. Each color is a
separate property.
--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
May thanks for your helps.
"Morten Wennevik" <Mo************@hotmail.com> wrote in message
news:op**************@msnews.microsoft.com... Actually, you wouldn't want a new car for every time you call Car.Nissan, so you might want to create them in advance and just return the reference for Nissan. This is how the Color class works, by returning a Color when calling the Blue/Green/Salmon... properties of the class. Each color is a separate property.
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