StrataFrame Forum » StrataFrame Application Framework - V1 » WinForms (How do I?) » Null dates in listview

Null dates in listview

Lesscher — Tue, 09 Sep 2008 09:08:35 GMT

Hi,

More questions about null values... :)

I use a datepicker to display a date. I have to use the replacement value trick (1800-1-1) in order to save a NULL value when there is no date. No problems here...

How can I show this field in a listview without showing the value 1800-1-1 to the user?

Regards,

Lesscher

RE: Null dates in listview

Edhy Rijo — Tue, 09 Sep 2008 09:08:35 GMT

[quote][b]William John Tello (09/09/2008)[/b][hr]Out of curiosity, why would you assign the displayvalue property to String.Empty as opposed to ""[/quote]

Hi William,

It is just for readability of the code, I rather see String.Empty than '' or "", in VFP you could use '', "", [] :P

RE: Null dates in listview

William John Tello — Tue, 09 Sep 2008 08:39:41 GMT

Edyhy,

Out of curiosity, why would you assign the displayvalue property to String.Empty as opposed to "" (which is what I would have done and I think a more C# standard way to do it). I'm just curious if there is an advantage to using the Empty static method of the .Net string class?

I'm also assuming there the C# string type must also have a string.Empty() counterpart (which I might have favored because I tend to use the C# types over the .Net types in my own coding).

RE: Null dates in listview

Edhy Rijo — Fri, 05 Sep 2008 09:28:30 GMT

Hi Lesscher,

You can use the ListView.RowPopulating event to handle that situation and many more...

[codesnippet]

Private Sub lstItems_RowPopulating(ByVal e As MicroFour.StrataFrame.UI.Windows.Forms.RowPopulatingEventArgs) Handles lstItems.RowPopulating

'-- Cast the BO to the type needed.

Using bo As bizItems = DirectCast(e.BusinessObject, bizItems)

If bo.MyDateTimeField = Nothing orElse bo.MyDateTimeField = #1800-1-1# then

e.Values(ColumnIndex).DisplayValue = String.Empty

End If

End Using

End Sub

[/codesnippet]

I have not tested the above, but that can give you an idea.