Validation error did not go away for comboBox in DataGrid after data is right....

Hi There,

The validation error does not go away even we choose the right data.

We load the ComboBox into the DataGrid as:

Column.EditTemplate = new DataTemplate(); editTemplate.VisualTree = EditComboBoxFactoryItemSrcStatic(string propertyName, bool isSelectedValueNItemSameType, ICollection values)

with the function as:

private static FrameworkElementFactory EditComboBoxFactoryItemSrcStatic(string propertyName, bool isSelectedValueNItemSameType, ICollection values)
        {
            Binding selectedItemBinding = new Binding(propertyName);

            FrameworkElementFactory editFactory = new FrameworkElementFactory(typeof(ComboBox));
            if (isSelectedValueNItemSameType)
            {
                selectedItemBinding.ValidationRules.Clear();
                selectedItemBinding.ValidationRules.Add(new ComboBoxNonValidationRule());
                selectedItemBinding.ValidatesOnDataErrors = true;
                editFactory.SetBinding(Selector.SelectedItemProperty, selectedItemBinding);
            }
            editFactory.SetBinding(Selector.SelectedValueProperty, selectedItemBinding);

            Binding itemSrcBinding = new Binding();
            itemSrcBinding.Source = values;

// I also tried to comment out the following 3 lines, and it does not work either. itemSrcBinding.ValidationRules.Clear(); itemSrcBinding.ValidationRules.Add(new ComboBoxNonValidationRule()); itemSrcBinding.ValidatesOnDataErrors = true;

            editFactory.SetBinding(ItemsSourceProperty, itemSrcBinding);

            return editFactory;
        }

double click on the combobox cell (empty cell initially) and did not select anything from the dropdown, then go to the next cell, at this time the combobox will have red-box surround it, which is correct since we need to choose something from drop down.

Now, go back to the combobox, choose something out of the drop down, then go to the next cell, the red-box still there, which is wrong since we have value for it.

Not sure how to fix it. It does not exist before. The full source code on how to load the combobox is in the LargeDataTable on thread:

The following are screen shot

Hello Gordon

Thanks for pointing this out. It looks like this issue has always been around. This will be resolved in the next nightly build.

Jason Fauchelle