Interface question

[Micki]

I have several classes implementing the same interface, let's call it "IMyData".

In the following method I want to copy the IMyData data from an object to
a new object of different type but implementing the same common interface
(IMyData).

The rest of the question is inline in the following function example:

Public Sub AddObjectToControl(ByVal Data As IMyData)
Dim MLI As New MyListItem()

Now I wan't to assign all the properties in IMyData
to CType(MLI,IMyData). Is there some better (shorter) way to do
this than assigning each property separately like this?
MLI.Property1 = Data.Property1
MLI.Property2 = Data.Property2
a.s.o.
??

Me.ListItems.Add(FItem)
End Sub

Thanks,
Micki

[Jesús Rodríguez]

If you really have lots of properties, you can use Reflection to acomplish
this task, cycling through the interface properties:
<NotTestedAndUglyAndProbablyIncorrect>
for each p in MyType.GetProperties()
p.SetProperty(dst,p.GetProperty(src,null),null)
next
</NotTestedAndUglyAndProbablyIncorrect>

You could event use custom attributes to specify which properties to
transfer.

"Micki" <mjs@nospam.beamex.com> escribió en el mensaje
news:3affc134$1@news.devx.com...
>
>
> I have several classes implementing the same interface, let's call it
"IMyData".
>
> In the following method I want to copy the IMyData data from an object to
> a new object of different type but implementing the same common interface
> (IMyData).
>
> The rest of the question is inline in the following function example:
>
> Public Sub AddObjectToControl(ByVal Data As IMyData)
> Dim MLI As New MyListItem()
>
> Now I wan't to assign all the properties in IMyData
> to CType(MLI,IMyData). Is there some better (shorter) way to do
> this than assigning each property separately like this?
> MLI.Property1 = Data.Property1
> MLI.Property2 = Data.Property2
> a.s.o.
> ??
>
> Me.ListItems.Add(FItem)
> End Sub
>
> Thanks,
> Micki

[Micki]

"Jesús Rodríguez" <alsagajesus@arrakis.es> wrote:
>If you really have lots of properties, you can use Reflection to acomplish
>this task, cycling through the interface properties:

Thank you!

If there really are not any simpler way to do this, I can se at least one
situation where C++ would have benefits over VB/C#.

If the same example were done in C++ with multiple inheritance, I could just
cast the object I want to copy the data to, to the base object containing
the data and then do a memcpy aka "=".