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Problems with UserControl and Inner Properties

Answer 1

A:

You have to implement your own Parser if you want to parse multiple child entries. You need to make your child class a user control and override "AddParsedSubObject". Here is a new version of your RssFeedCollection that will accept multiple strings separated by Carriage Returns instead of RssResource objects. You can make the parser more advanced and parse XML instead of strings if you still need it to do that.

<ParseChildren(False)>
<PersistChildren(False)>
Public Class RssFeedCollection
    Inherits Web.UI.Control

    Private _URLs As String()
    Public ReadOnly Property URLs As String()
        Get
            Return _URLs
        End Get
    End Property

    Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)
        Dim s = DirectCast(obj, LiteralControl).Text.Trim.Replace(" ", "") 'remove spaces
        Dim separator = New Char() {Microsoft.VisualBasic.vbCr(0)}

        _URLs = s.Split(separator, System.StringSplitOptions.RemoveEmptyEntries)

        MyBase.AddParsedSubObject(obj)
    End Sub
End Class

Carter 2010-07-30 18:49:29

Thanks for your response. This may work but I know the example on Brian Chavez's site works as expected and doesn't involve this and I'd like to avoid making the RssFeedCollection a UserControl when it really is better suited as a simple collection of simple objects

Dustin Hodges 2010-07-30 18:56:38

@EDIT: It only has to inherit from Control, my mistake.

Carter 2010-07-30 19:03:25

I added a new solution. The old one is still useful to highlight the use of the "AddParsedSubObject" method, but the new one allows you to use the attributes properly.

Carter 2010-07-30 21:15:02

Answer 2

A:

Here is a simpler solution. I removed your AggregateSettings for this example; that code should work the same as before.

Here is the ASPX I am using.

    <uc:AggregateFeeds runat="server" ID="af">
        <Feeds>
            <RssResource Url="Test1" />
            <RssResource Url="Test2" />
            <RssResource Url="Test3" />
        </Feeds>
    </uc:AggregateFeeds>

Here is the User control code.

Partial Class AggregateFeeds
    Inherits System.Web.UI.UserControl

    Private _Feeds As New MyFeedsClass(Me)

    <PersistenceMode(PersistenceMode.InnerProperty)>
    Public ReadOnly Property Feeds As MyFeedsClass
        Get
            Return _Feeds
        End Get
    End Property
End Class

Public Class MyFeedsClass
    Inherits ControlCollection

    Sub New(ByVal owner As Control)
        MyBase.New(owner)
    End Sub

    Public Overrides Sub Add(ByVal child As System.Web.UI.Control)
        MyBase.Add(New Feed(child))
    End Sub
End Class


Public Class Feed
    Inherits HtmlGenericControl

    Sub New(ByVal GenericControl As HtmlGenericControl)
        MyBase.New()
        Me.Url = GenericControl.Attributes("Url")
    End Sub

    Public Property Url As String = String.Empty

    Public Overrides Function ToString() As String
        Return Me.Url
    End Function
End Class

It works assuming every child control is an html generic control. Do not use <uc in the child control so it won't attempt match an actual class.

Carter 2010-07-30 21:07:47

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Problems with UserControl and Inner Properties

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