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POWPF DataGrid - Validation Recommendations
 

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    <p>We are implementing a WPF business application using MVVM. Currently we are trying to determine the best way to show validation errors for DataGrids. Currently we are trying to do so like this:</p> <p>1) A View user control contains a datagrid bound to an EntityCollection of Entity Framework objects located in the associated ViewModel</p> <p>2) The ViewModel implments the IDataErrorInfo interface. In the ViewModel there are the normal properties including a property for implementing IDataErrorInfo.Item</p> <p>3) The property which implements IDataErrorInfo.Item calls the validation from the underlying Model to determine if there are any validation issues</p> <p>This works fine for any textbox or combobox on the view - validatiosn are being processed as expected. But with the datagrid we are stumped - no matter what we have tried the validation will not happen. Currently it is defined like this:</p> <pre><code>&lt;DataGrid x:Name="dgWikiNames" ItemsSource="{Binding Wiki_Names, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True, NotifyOnSourceUpdated=True}" AutoGenerateColumns="False"&gt; &lt;DataGrid.RowValidationRules&gt; &lt;DataErrorValidationRule ValidationStep="UpdatedValue"/&gt; &lt;/DataGrid.RowValidationRules&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Header="First Name"&gt; &lt;DataGridTextColumn.Binding&gt; &lt;Binding Path="First_Name" ValidatesOnDataErrors="True"&gt; &lt;Binding.ValidationRules&gt; &lt;DataErrorValidationRule/&gt; &lt;!--&lt;local:CellDataInfoValidationRule ValidationStep="UpdatedValue"/&gt;--&gt; &lt;/Binding.ValidationRules&gt; &lt;/Binding&gt; &lt;/DataGridTextColumn.Binding&gt; &lt;/DataGridTextColumn&gt; &lt;DataGridTextColumn Header="Is Primary" Binding="{Binding Primary_Flag}"/&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; </code></pre> <p>If anyone has any pointers or recommendations we'd appreciate it. Thanks</p>
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