Hello,

 I have a column which I would like to validate with custom validation rule. I've found EventCellValidationRule class in documentation and created a derieved class:

     public class AttributeValueValidationRule : EventCellValidationRule

    {

        public override ValidationResult Validate(object value, CultureInfo cultureInfo,

                                                 CellValidationContext cellValidationContext)

        {

//some validation code

        }

    } 

 Also I've added this class to column's CellValidationRules collection and created handler for Validating event:

                     <xcdg:Column FieldName="Value" Title="Value" CellEditor="{x:Static xcdg:CellEditor.TextBoxEditor}">

                        <xcdg:Column.CellValidationRules>

                            <local:AttributeValueValidationRule Validating="AttributeValueValidationRule_Validating"/>

                        </xcdg:Column.CellValidationRules>

                    </xcdg:Column>                    

         private void AttributeValueValidationRule_Validating(object sender, CellValidatingEventArgs e)

        {

//some code here

        } 

But it seems that Validating event is never raised. Or it does not work this way? Could you please tell me what am I doing wrong?

Thanks,

Igor 

Hi Igor,

You have probably forgotten to call the Validate method on base in the Override of the Validate method of your derived class.

Update your code as follow to make it work:

public class AttributeValueValidationRule : EventCellValidationRule

  {

    public override ValidationResult Validate( object value, CultureInfo cultureInfo,CellValidationContext cellValidationContext )

    {

      //some validation code

      //you must call the base method in order to call the validating event handler

      base.Validate( value, cultureInfo, cellValidationContext );

      return ValidationResult.ValidResult;

    }

  }

And

private void AttributeValueValidationRule_Validating( object sender, CellValidatingEventArgs e )

    {

      //some code here

      object o = e.Value;

    }

Hi Mohamed,

  Thanks a lot, now it works. But it seems that Validating event is supposed to be raised only if validation succeeds. Am I right?

 Igor