HOWTO: Update a datagrid bound to a collection???

[Eric J]

I need some help around this problem I am having with a datagrid bound to a
collection.

I have a button on my form that adds a record to the collection that is
bound to the datagrid. I want the grid to visibly update as items are
added, so the following code executes each time I press the "add" button:

myDataGrid.DataSource = null;
myCollection.Add(new Foo());
myDataGrid.DataSource = myCollection;

The above code seems like a bit of a hack, but I haven't been able to
discover another way to update the control. In any event, this code works
perfectly until I click in the updated DataGrid and then click on any other
control in the form. When I do that, I am stopped with a messagebox showing
this error:

Specified argument was out of the range of valid values.
Parameter name: Index was out of range. Must be non-negative and
less than the size of the collection. Do you want to correct the
value?

How do I prevent this from happening? I have the feeling it is because I am
not properly updating the datagrid itself. If that is the case, how am I
supposed to redraw the data grid to reflect the change in the data? Calls
to Refresh() and Update() don't seem to work.

Thanks,

-e

 

[Bo Ching]

If the underlying data source implements the IBindingList interface, and the
AllowNew property is set to true, you can use the AddNew method.


http://msdn.microsoft.com/library/d...stemWindowsFormsCurrencyManagerClassTopic.asp

You can google some sample on CurrencyManager and you should be able to
master it.

Bo

 

[Stephen Muecke]

Your collection and object classes need to implement IBindingList and
IEditableObject respectively
Refer to the following article

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnadvnet/html/vbnet02122002.asp

Stephen