Disable DataGridCell if another cell is being used

Question

On a row inside of a datagrid, I'm trying to disable a cell/field if the cell next to it is being used or vice verse. In other words the user can only enter one or the other, if the user enters info into one cell the other should be disabled or readonly or something. How can I achieve this? Can I somehow create a converter? At the same time the user should be able to zero out that cell in case he didn't mean to enter info in that cell. Any advice is much appreciated.

 <DataGridTextColoumn Binding="{Binding Property1}" Header="Property1" />
 <DataGridTextColoumn Binding="{Binding Property2}" Header="Property2" />

-So if i enter info into property1 cell then i shouldn't be able to enter anything into property2 cell. If i enter something into property2 cell then I shouldn't be able to enter anything into property1 cell.

score 1 · Accepted Answer · edited May 23 '17 at 11:56

1

A converter could work (as you mentioned). Something like this

<Window 
    ...
    xmlns:c="clr-namespace:*YourConverter'sNamespace*"
    ...
    />
<Window.Resources>
    <c:NotBlankConverter x:Key="NotBlankConverter"/>
</Window.Resources>
...
<DataGridTextColoumn 
    Binding="{Binding Property1}" 
    Header="Property1" 
    IsReadOnly="{Binding Property2, Converter={StaticResource NotBlankConverter}"
    />
...

Where your converter can look something like this

class NotBlankConverter: IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return string.IsNullOrEmpty(value);
    }
    ...
}

Update

It appears this actually will not work because of the way the IsReadOnly DP works for the DataGridTextColumn. To have a complete working solution, something from these questions needs to be implemented...

.Net v4 DataGridTextColumn.IsReadOnly seems to be faulty

DataGridTextColumn - How to bind IsReadonly?

edited May 23 '17 at 11:56

Community

1
1

answered Aug 13 '12 at 17:06

Kevin DiTraglia

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For some reason the converter isn't hitting when I put a breakpoint on Convert – TMan Aug 13 '12 at 17:19
I don't have to call a relativesource when I bind do I? – TMan Aug 13 '12 at 17:20
I left out a few steps assuming you have used a converter before, you need to declare it as a resource first. I can edit the answer to make it more complete. – Kevin DiTraglia Aug 13 '12 at 17:20
I did that, my xmlns is a local: pointing to the a project that holds all my converters, then I declared it and set a key on it – TMan Aug 13 '12 at 17:45
So the converter will work if I use datagridtemplatecolumns but unfortunately it messes up the CanUserAddRows="True" property – TMan Aug 16 '12 at 13:24

Disable DataGridCell if another cell is being used

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