Object Data Source class property

Colonel Angus · March 17th, 2008, 10:35 AM

I am having difficulty assigning a property to be used in an ObjectDataSource SELECT method. I am able to set the parameters to match my method signature properly with no problem.

However, my method also uses an object public property - it is not part of the method signature. How am I able to set this public property and have it consumed by the method call?

It's like this:

Public Class myClass

Public Property myProp() As String
   Get
       Return m_myProp
   End Get
   Set(ByVal Value As String)
       m_myProp = Value
   End Set
End Property

Public Function GetData(myParam1 as Integer, myParam2 as String) as DataSet
    dim ds as DataSet
    .
    .
    If m_myProp = 1 Then
        'do something
    End If
    .
    return ds
End Function

Is my only option to change the method signature?

Thanks in advance for your comments.

Imar · March 17th, 2008, 11:49 AM

Hi there,

Take a look here: http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=368 and look at method #3 in particular. It shows you how to create a new instance of your business object, set the necessary properties and then let the ODS figure out the rest.

Hope this helps,

Imar
---------------------------------------
Imar Spaanjaars
http://Imar.Spaanjaars.Com
Everyone is unique, except for me.
Author of Beginning ASP.NET 3.5 : in C# and VB, ASP.NET 2.0 Instant Results and Dreamweaver MX 2004
Want to be my colleague? Then check out this post.

Colonel Angus · March 17th, 2008, 11:56 AM

Imar-

Funny you mention that. I took a look at it before I posted. I'm still not sure how you tie that OnCreated method to the method call.

Imar · March 17th, 2008, 12:05 PM

First you need to write code for the ObjectCreating event of the ODS, like this:

Code:

Protected Sub ObjectDataSource1_ObjectCreating(ByVal sender As Object, _
       ByVal e As System.Web.UI.WebControls.ObjectDataSourceEventArgs) _
       Handles ObjectDataSource1.ObjectCreating
  Dim myInstance As New MyClass()
  myInstance.myProp = "Whatever value you need here"
  e.ObjectInstance = myInstance
End Sub

That way, an instance of your business object is created when the ODS is about to call your method.

Next, within your method, you should be able to retrieve the myProp property (using m_myprop or myProp) and get at the value you set in the ObjectCreating event in the page.

Hope this helps,

Imar
---------------------------------------
Imar Spaanjaars
http://Imar.Spaanjaars.Com
Everyone is unique, except for me.
Author of Beginning ASP.NET 3.5 : in C# and VB, ASP.NET 2.0 Instant Results and Dreamweaver MX 2004
Want to be my colleague? Then check out this post.

Colonel Angus · March 17th, 2008, 02:02 PM

That did the trick. I can now send my value to the object method.

Dank U Imar

Imar · March 17th, 2008, 03:21 PM

Graag gedaan... ;)

Imar
---------------------------------------
Imar Spaanjaars
http://Imar.Spaanjaars.Com
Everyone is unique, except for me.
Author of Beginning ASP.NET 3.5 : in C# and VB, ASP.NET 2.0 Instant Results and Dreamweaver MX 2004
Want to be my colleague? Then check out this post.