VB.net 2010-刷新数据集时来自datagridview的IndexOutOfRange

Question

I have a datagridview on a form that is bound to a table in a dataset from another class.

I use a data adapter to .Fill a table in that dataset and the grid displays the data fine.

Works fine.

On my form I have a textbox the user can type in that will will pass a parameter to the storedprocedure used to fill this table. So on startup the textbox will have "%" in it. and then the user can type in "F%" and get everything that starts with an "F"

So when that textbox changes I launch an async refresh (.BeginInvoke) to do my refresh. The table gets populated with the reduced number of records (I check ds.table(0).rows.count and it is correct)

But the datagridview then starts throwing datagridview.dataerror events. "System.IndexOutofRangeException : Index # does not have a value"

It looks like the dataset is getting filled correctly and not having any issues, but the datagrid is not liking this update. The index out of range error is so common that I'm not finding what I need through searches.

Thanks in advance! :)

Answer 1

I don't know the solution to your specific problem, but it seems like a waste to hit the database for every keystroke when all the data is loaded up front.

Rather than requerying the database every time, why not set the RowFilter of the DataView and skip the database call?

Answer 2

Well, find the error.

• Take out the BeginInvoke and do it synchronous. See if that fixes it. If not, leave it out until you're sure you have no other problems.

• @roadie has a good comment on resetting the SelectedRow

• There are similar ways to enforce the update. Like

..

   bindingSource.DataSource = null; 
   bindingSource.DataSource = myTable;

Answer 3

I had a similar problem and it was because I wanted to do this:
dg1.CurrentCell = dg1.Rows(dg1.RowCount - 1).Cells(1)
after changing dg1.DataSource.
It seems to be dangerous to use RowCount when AllowUserToAddRows = True.
I switched it to False and it worked.