Is there a way to keep the tags from being nulled as soon as I sort the grid?
If not, is the Tag property actually useful for anything except non-databound usage?
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A:
Based on you last question, you are setting the Tag of DataGridViewRow objects. And they might very well be re-created during a Sort operation. Use reflector to make sure, but I would start looking for a workaround.
In general, the Tag property is a last resort.
You could use a Dictionary<object, object> to couple your data to the dgvr.DataBoundItem as key.
Henk Holterman
2009-11-17 19:24:51
I am, and it looks like you're right. If is DataSource null DataGridView.Sort() calls an internal Sort method on the Rows object. If DataSource has a value it calls the Sort method on the dataConnection member. That disappears into a ratsnest of interfaces; but I assume it eventually ends up somewhere in DataTable and ends up recreating the rows. Times like this make me nostolgic for MFC where I could trace into the framework at runtime and confirm if the rows were getting replaced by looking at pointer addresses...
Dan Neely
2009-11-17 20:50:55
The DataRows in the DataTable are certainly not recreated (they end up as the DataBoundItem in the dgvr). Try using them a little more.
Henk Holterman
2009-11-17 21:00:41
To Clarify I was referring to the DataGridViewRows that have the Tag property that is getting wiped out.
Dan Neely
2009-11-17 21:13:10