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ASP.NET 2.0 Everyday Apps For Dumies 2006 phần 6 docx
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Mô tả chi tiết
Listing 6-13 (continued)
return _state;
}
set
{
_state = value;
}
}
public string ZipCode ➝9
{
get
{
return _zipCode;
}
set
{
_zipCode = value;
}
}
public string Email ➝10
{
get
{
return _email;
}
set
{
_email = value;
}
}
public string PhoneNumber ➝11
{
get
{
return _phoneNumber;
}
set
{
_phoneNumber = value;
}
}
}
The following paragraphs define each component of this class:
➝ 1 The class begins by defining private instance variables that are
used to hold the values associated with the class properties.
By convention, each of these variable names begins with an
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underscore to indicate that it corresponds to a property with the
same name.
➝ 2 The default constructor creates a Customer object with default
values for each of its properties.
➝ 3 This constructor accepts arguments that initialize the customer
data. Notice that the assignment statements don’t directly assign
values to the instance variables of the class. Instead, they use the
properties to assign these values. That way, any validation routines written in the property setters will be used. (In this example,
none of the property setters have validation routines. Still, it’s a
good practice to follow just in case.)
➝ 4 The LastName property represents the customer’s last name. Its
get routine simply returns the value of the _lastName instance
variable, and its set routine simply sets the _lastName variable
to the value passed via the value argument.
➝ 5 The FirstName property represents the customer’s first name,
which is stored in the _firstName instance variable.
➝ 6 The Address property represents the customer’s address, stored
in the _address instance variable.
➝ 7 The City property represents the customer’s city, stored in the
_city instance variable.
➝ 8 The State property represents the customer’s state, stored in the
_state instance variable.
➝ 9 The ZipCode property represents the customer’s Zip code, stored
in the _zipCode instance variable.
➝ 10 The Email property represents the customer’s e-mail address,
stored in the _email instance variable.
➝ 11 The PhoneNumber property represents the customer’s phone
number, stored in the _phoneNumber instance variable.
Listing 6-14: The Customer class (VB version)
Imports Microsoft.VisualBasic
Public Class Customer
Private _lastName As String ➝1
Private _firstName As String
Private _address As String
Private _city As String
Private _state As String
Private _zipCode As String
Private _phoneNumber As String
(continued)
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Listing 6-14 (continued)
Private _email As String
Public Sub New() ➝2
End Sub
Public Sub New(ByVal lastName As String, _ ➝3
ByVal firstName As String, _
ByVal address As String, _
ByVal city As String, _
ByVal state As String, _
ByVal zipCode As String, _
ByVal phoneNumber As String, _
ByVal email As String)
Me.LastName = lastName
Me.FirstName = firstName
Me.Address = address
Me.City = city
Me.State = state
Me.ZipCode = zipCode
Me.PhoneNumber = phoneNumber
Me.Email = email
End Sub
Public Property LastName() As String ➝4
Get
Return _lastName
End Get
Set(ByVal value As String)
_lastName = value
End Set
End Property
Public Property FirstName() As String ➝5
Get
Return _firstName
End Get
Set(ByVal value As String)
_firstName = value
End Set
End Property
Public Property Address() As String ➝6
Get
Return _address
End Get
Set(ByVal value As String)
_address = value
End Set
End Property
Public Property City() As String ➝7
Get
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Return _city
End Get
Set(ByVal value As String)
_city = value
End Set
End Property
Public Property State() As String ➝8
Get
Return _state
End Get
Set(ByVal value As String)
_state = value
End Set
End Property
Public Property ZipCode() As String ➝9
Get
Return _zipCode
End Get
Set(ByVal value As String)
_zipCode = value
End Set
End Property
Public Property Email() As String ➝10
Get
Return _email
End Get
Set(ByVal value As String)
_email = value
End Set
End Property
Public Property PhoneNumber() As String ➝11
Get
Return _phoneNumber
End Get
Set(ByVal value As String)
_phoneNumber = value
End Set
End Property
End Class
Creating the ShoppingCart Class
The ShoppingCart class represents the user’s virtual shopping cart, as
described in detail earlier in this chapter (see Table 6-5). Now, Listing 6-15
presents the C# version of the ShoppingCart class, and the Visual Basic version is shown in Listing 6-16.
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