Columns.Add throws an exception | Infragistics Forums

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Columns.Add throws an exception

A posted over 13 years ago

We are using 11.1..

In our GUI, when the user refreshed data on the grid, we call

xamGrid.Columns.Clear

and then do something like this...

if (xamGrid.Columns[colName] == null)

{

textColumn = new TextColumn();

textColumn.Key = colName;

xamGrid.Columns.Add(textColumn);

}

We get an "Object reference not set to an instance of an object" at the line xamGrid.Columns.Add ..

The stack trace shows this

at Infragistics.Controls.Grids.XamGridRowsManager.InvalidateGroupBy(Boolean reset).

How do I get rid of this error? I verified that the column count was zero after the call to the Columns.Clear

1052

Roger posted over 13 years ago in reply to Stephen Zaharuk

I am having the same issue. It happens only when grid is not part of visual tree (for example you try to add columns and you have different view navigated). I will create bug request for this.
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Offline Stephen Zaharuk posted over 13 years ago

Hi,

I tried the code you posted in a button click, and it worked just fine:

this.grid1.Columns.Clear();

            if (grid1.Columns["Number"] == null)
            {
                TextColumn tc = new TextColumn();
                tc.Key = "Number";
                this.grid1.Columns.Add(tc);
            }

What do you mean by referesh data...are you calling a method on the xamGrid or applying a new 
itemsSource?

Where are you adding the new columns? By that, i mean are you calling int while the xamGrid is 
performing an operation?

If you have a sample that shows this issue, it'd be much more helpful, and would allow me to figure 
out the problem a lot quicker.

Thanks,

-SteveZ