I have an object, called 'PERSON'
This person object has a title, firstName & Surname property as well as many other which are at the moment irrelevant. It also has a read only property called Fullname which concatenates the two or three parameters mentioned above depending on an optional parameter 'withTitles' passed over when you call PERSON.FULLNAME
PERSON.FULLNAME(true) <- Will add titles if there are any
PERSON.FULLNAME(false) <- Will give the name without the title
Public ReadOnly Property FullName(Optional ByVal withTitle As Boolean = False) As String
Get
Dim _ttle As String = Me.Title
Select Case withTitle
Case True
开发者_JAVA百科 If _ttle.Length > 0 Then _ttle += " " Else _ttle = String.Empty
Case False
_ttle = String.Empty
End Select
If Me.FirstName <> "" And Me.LastName <> "" Then
Return _ttle & Me.FirstName & " " & Me.LastName
ElseIf Me.FirstName = "" And Me.LastName <> "" Then
Return _ttle & Me.LastName
ElseIf Me.FirstName <> "" And Me.LastName = "" Then
Return _ttle & Me.FirstName
ElseIf Me.FirstName = "" And Me.LastName = "" Then
Return Me.ContactName
End If
End Get
End Property
My problem surfaces when I try to bind my PERSONCOLLECTION (a collection of the PERSON object) to a RadioButtonList or any other binding control at that.
RadioButtonList1.DataSource = _personCollection
RadioButtonList1.DataTextField = "FullName"
RadioButtonList1.DataValueField = "ContactID"
RadioButtonList1.DataBind()
I get an error: PERSON does not contain a property of 'FullName'. If I change this to any other property that does not take a parameter it works as expected.
Now I'm guessing that the binding procedure can't handle optional or mandatory parameters for object properties, is this right? Is there a better way to do it?
I thought about looping through the collection to add them manually but that kinda defeats the object of DataBinding!
Any help would be apreciated. Kev.
I would recommend creating two properties, FullName
and FullNameWithTitle
. Although properties can take parameters they are intended to be indexers into the object and not actionable values. For instance a class that represents a collection of Color
objects might have an Item
property with an optional index being the specific color to return.
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