Adding new row to DataGridView bound to Custom Object

[Guest]

I have a DataGridView bound to a collection of Custom Objects. I have
enabled adding new rows, but since my object does not have a public
constructor (it uses a factory method), I get an error when I attempt to
enter the new row. My guess is that I need to override some method so that I
can create the object for the grid. But for the life of me, and I can't find
it. Can someone point me in the right direction?

 

[Brendon Bezuidenhout]

Terry,

Have you tried just inserting a new row into the data source of the
DataGridView object?

Brendon

 

[Guest]

Hi,
No, I haven't. Are you suggesting that I pre-create a new object and
have it in the grid just in case the user wants to add one? I suppose that
that could be made to work. I still have to believe that there is some
method that I can override or some event I can subscribe to, that would allow
me to create the object for the grid.

 

[Brendon Bezuidenhout]

Terry,

No what you want to do do is inefficient... when they add a new "row" as it
were you create a new datadow and add that data row to the datasource which
is a DataTable (sucking it from my head now so could be wrong on the type).
Then when they close/save then you save and add the new row as per normal to
your DB... Why don't you look into the BindingManager and BindingSource also
it will help and might make you rethink things slightly.

Brendon

Hi,
No, I haven't. Are you suggesting that I pre-create a new object and
have it in the grid just in case the user wants to add one? I suppose
that
that could be made to work. I still have to believe that there is some
method that I can override or some event I can subscribe to, that would
allow
me to create the object for the grid.

 

[Guest]

Ok, turned out to be fairly easy - once I figured out where to do it!
The grid is bound to a bindingsource which raises a 'AddingNew' event. So
the code looks like...
Private Sub LogListBindingSource_AddingNew(ByVal sender As Object, ByVal e
As System.ComponentModel.AddingNewEventArgs) Handles
LogListBindingSource.AddingNew

e.NewObject = Log.Create(Id)

End Sub