Adding logic to Business Object

The easiest way is probably a business rule.  In the rule check the new value, and if it is try, loop through all other rows in parent list and set them to false( if they are true).

 

Sergey Barskiy

Principal Consultant

office: 678.405.0687 | mobile: 404.388.1899

Microsoft Worldwide Partner of the Year | Custom Development Solutions, Technical Innovation

 

 

 

I have a BusinessBaseList bound to a Grid control, one of the columns is a check box.  Only one row can can have a tick in the checkbox, so if a user puts a tick in another row, the previous checked row must have the value removed.

I have currently got this working by looping around the row collection of the grid and setting all rows other then the newly checked to unchecked.

Although this is working, our next stage is to create a web front end as well as the windows version.

So we really need this logic in the business object, what would be the best way to achieve this? 

Thanks

I think you would need the Equals check and move the rule to articleImage level

private static bool IsHomepageCheck<T>(T target, Csla.Validation.RuleArgs e) where T : ArticleImage
{
      foreach (ArticleImage artImg in (ArticleImageList)target.Parent))
      {
            If (!(artImg.Equals(target) && artImg.IsHomepage == true)

            artImg.IsHomepage = false;
      }

      return true;
}

 

 

Sergey Barskiy

Principal Consultant

office: 678.405.0687 | mobile: 404.388.1899

Microsoft Worldwide Partner of the Year | Custom Development Solutions, Technical Innovation

 

 

Thanks Sergey,

I have it working in most part, but I do not know how to get the value of the child object that has changed.

For instance everytime a checkbox is clicked the Custom Rule is fired and sets all the checkboxes to false, however I am unsure of how to ignore the child row that has changed.

Here is my custom validation rule that is set in the parent object.

private static bool IsHomepageCheck<T>(T target, Csla.Validation.RuleArgs e) where T : Article
{
      foreach (ArticleImage artImg in target._articleImages)
      {
            artImg.IsHomepage = false;
      }

      return true;
}

As you can see I am setting all the items to false, but I need to ignore the item that has been changed.

Thanks

Andy