Visual Studio 2010!

Read now >

View Now
DevSource RSS FEEDS
XML Want an easy way to keep up with breaking tech news? And the Get DevSource headlines delivered to your desktop with RSS.
ADVERTISEMENT
ADVERTISEMENT

 

DevSource.com: Your Source for Visual Studio on Facebook
ADVERTISEMENT
Creating and Consuming Web Services
By Gregg D. Harrington
2002-03-25

Article Rating:starstarstarstarstar / 0

  Table of Contents:
  1. Creating and Consuming Web Services
  2. ' The Good, the Bad, '
  3. ' What Exactly is a '
  4. ' Comparison to Local Classes '
  5. ' Converting Our Class to '
  6. ' Our Web Service In '
  7. ' '

Rate This Article: Add This Article To:
Poor Best

Creating and Consuming Web Services - ' Comparison to Local Classes '
( Page 4 of 7 )

and Objects">

Perhaps the best way to understand the capabilities and limitations of Web Services is to compare them to other techniques. First, let's compare the consumption of a Web Service to the consumption of a local object. Later, we'll compare Web Services to other distributed application techniques.

Let's look at an example of a simple class called Plane that has private members, public read-write and read-only properties, default and non-default constructors, and a public function. 


Public Class Plane
    'private members
    Private mName As String
    Private mPassengers As Integer
    Private mRange As Integer
    Private mEngines As Integer
    Private mTailNumber As String

    'read-write properties
    Public Property Name() As String
        Get
            Return mName
        End Get
        Set(ByVal Value As String)
            mName = Value
        End Set
    End Property

    Public Property Passengers() As Integer
        Get
            Return mPassengers
        End Get
        Set(ByVal Value As Integer)
            If Value < 100 Then
                mPassengers = Value
            End If
        End Set
    End Property

    Public Property Engines() As Integer
        Get
            Return mEngines
        End Get
        Set(ByVal Value As Integer)
            mEngines = Value
        End Set
    End Property

    'read-only property
    Public ReadOnly Property PlaneTailNumber()
        Get
            Return mTailNumber
        End Get
    End Property

    'default constructor
    Public Sub New()

    End Sub

    'non-default constructor, takes input parameters 
    Public Sub New(ByVal TailNumber As String, ByVal Passengers As Integer, ByVal Range As Integer)
        mName = "Bonanza Man"
        mRange = Range
        mPassengers = Passengers
        mEngines = 1
        mTailNumber = TailNumber
    End Sub

    'public function
    Public Shared Function CalcRange(ByVal Fuel As Integer) As Integer
        'Range increase by 10 miles for each gallon of fuel
        Dim Range As Integer

        Range = Fuel * 10

        Return Range
    End Function
End Class

A piece of code local to this class could access the read-only and read-write properties, both constructors, and the public function. Of course, the private member variables are private to this class and cannot be accessed outside of it.

To use the class, a consuming application would dimension a variable of type Plane and then create a new instance of it; in our example below, we use the parameterized constructor and then display the plane's tail number. 


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim aPlane As Plane
        aPlane = New Plane("N84DL", 4, 200)

        MessageBox.Show(aPlane.PlaneTailNumber)
    End Sub




Discuss Creating and Consuming Web Services
 
>>> Be the FIRST to comment on this article!
 


 
 
>>> More ASP and .Net Coding Techniques Articles          >>> More By Gregg D. Harrington