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ToolTipService.GetToolTip Value is Null Exception

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GridView

This is a migrated thread and some comments may be shown as answers.

Phillip asked on 13 Jul 2016, 09:51 AM

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Hi everyone,

in the attached file you see the exception I get (Sorry, it's in German). The Problem with this exception is, that it appears not every time by doing the same steps. So we can't say definititly what step let this exception occures.

So here are the circumstances:

RadGradView with some columns (4-5)
Binding on a DataTable
ReadOnly = false

So when from a dialog a value is puttin' in one of the cells, the problem somtimes appears.

I downloaded the source code and searched a bit. (In GridView_WPF.sln: GridView/Cells/GridViewCell.cs)

In the method 'PrepareCellToolTip' the second time when ToolTipService.GetToolTip is called:

var visualElementToolTip = ToolTipService.GetToolTip(this);

var isCellErrorToolTip = this.CellErrorMessage != null && this.CellErrorMessage == visualElementToolTip;

var row = this.ParentRow as GridViewRow;

var rowToolTip = ToolTipService.GetToolTip(row) ?? string.Empty;

Before row is hand over to 'GetToolTip()', there should be proved if it isn't null, right?

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