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Editorial Team
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Asked: 2026-05-16T17:59:44+00:00

I have created a datagrid with columns bound to an observable collection. All works

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I have created a datagrid with columns bound to an observable collection. All works well except for a column which is bound to a nullable decimal property from my business object.

If I use

<DataGridTextColumn Binding="{Binding Path=BaseUnitCostValue}" Header="Unit Cost Value" MinWidth="100" />

as my column definition all works well, however, as I will eventually want it to be a complex column I tried using a DatagridTemplateColumn such that

<DataGridTemplateColumn Header="Unit Cost Value" MinWidth="100">
    <DataGridTemplateColumn.CellEditingTemplate>
        <DataTemplate>
            <TextBox Text="{Binding BaseUnitCostValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
        </DataTemplate>
    </DataGridTemplateColumn.CellEditingTemplate>
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding BaseUnitCostValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" TextAlignment="Right"/>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

However, using this the column configuration, although I can enter a value as soon as I finish the edit to the cell, its value disappears.

I’ve also tried using converters to convert to a string and back again to a nullable decimal but with no luck.

I strongly suspect that this is something to with the fact that it’s bound to a nullable decimal. Is there something more I need to do to my cellTemplates so that the value binds correctly, in the same way is does when using a standard DataGridTextColumn?

Thanks

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1 Answer

  1. Editorial Team

    Maybe it’s because you try to make a two-way-binding for the TextBlock in the non-edit Template:

     <DataGridTemplateColumn.CellTemplate> 
        <DataTemplate> 
            <TextBlock Text="{Binding BaseUnitCostValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" TextAlignment="Right"/> 
        </DataTemplate> 
    </DataGridTemplateColumn.CellTemplate>

    Try to change it to one-way, may it works then. Remove also the Trigger-statement.

    If it does not help, look in the output-window, if you see a related message.

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