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trouble converting VB IWebBusinessBindable to C#

Govinda Berrio — Tue, 26 Aug 2008 13:33:18 GMT

Hi all,

I'm trying to implement the IWebBusinessBindable and IWebListControl with a Telerik RadComboBox. I think I'm on the right track by just copying the code from Strataframe source code, but I'm stuck the conversion of the VB code C#. I ran the code through an online VB-> C# converter and most of it compiles fine except for the "Events" section where the IWebListControl event ListPopulating needs to be implement. The C# code that the converter generates doesn't compile.

Here's the IWebListControl interface snippet
[codesnippet]Event ListPopulating(ByVal e As ListPopulatingEventArgs)[/codesnippet]

Here's how Strataframe implements it in Microfour.Strataframe.UI.Web.DropDownList
[codesnippet] Public Event ListPopulating(ByVal e As ListPopulatingEventArgs) Implements IWebListControl.ListPopulating

Friend Sub RaiseListPopulatingEvent(ByVal e As ListPopulatingEventArgs) Implements IWebListControl.RaiseListPopulatingEvent
RaiseEvent ListPopulating(e)
End Sub[/codesnippet]

Here's the converter generated code, which doesn't compile
[codesnippet]
public event IWebListControl.ListPopulating;

internal void IWebListControl.RaiseListPopulatingEvent(ListPopulatingEventArgs e)
{
if (ListPopulating != null) {
ListPopulating(e);
}
}[/codesnippet]

If anyone could shed some light on this, it would be very helpful as I'm not that experienced in .net development.

Thank You,
Govinda

RE: trouble converting VB IWebBusinessBindable to C#

Govinda Berrio — Tue, 26 Aug 2008 13:33:18 GMT

I looks like the solution is that... Thanks Greg.
[codesnippet]public event MicroFour.StrataFrame.UI.IWebListControl.ListPopulatingEventHandler ListPopulating;

void IWebListControl.RaiseListPopulatingEvent(ListPopulatingEventArgs e)
{
if (ListPopulating != null) {
ListPopulating(e);
}
}[/codesnippet]

But now the IWebListControl.PopulateList(params object[] Parameters) interface method won't compile. The error that I'm getting is [quote]Argument '1': cannot convert from 'GKG.WebControls.sfRadComboBox' to 'System.Web.UI.WebControls.ListControl'[/quote]
[codesnippet] void IWebListControl.PopulateList(params object[] Parameters)
{
if (!this.DesignMode)
{
WebListControl.PopulateCombo(this, (MicroFour.StrataFrame.Tools.ITypeResolver)this.Page, Parameters);
}
}[/codesnippet]

I believe this is because the Telerik RadComboBox doesn't have System.Web.UI.WebControls.ListControl in it's inheritance hierarchy. Can any of the developers look into this because I would really like to use these controls with Strataframe.

Thank You

RE: trouble converting VB IWebBusinessBindable to C#

Greg McGuffey — Tue, 26 Aug 2008 13:16:07 GMT

I'm not a C# expert, but I think the problem is in the declaration of the event:

[codesnippet]public event IWebListControl.ListPopulating;[/codesnippet]

which is missing a type. You need to add the delegate type:

[codesnippet]public event ListPopulatingEventHandler IWebListControl.ListPopulating;[/codesnippet]

That probably isn't quite it, but the form needs to be:

[codesnippet]public event [delegate type] [event name];[/codesnippet]

Hope that is helpful! :D