Propertygrid validation errors

[Lakshmi]

I have two issues:

1) On data type validation, I see the row highlight but do not see any error message as a comment that I see in DataAnnotations Support demo

2) How do I add validations like Required field validation or any custom validation at runtime.

I am using 2013.2.724.45 version of telerik controls.

[Dimitrina]

Hello,

As to your questions:
1. The declarative data annotation attributes (i.e. DisplayName) are only supported for auto-generated property definitions by design. Do you have the PropertyDefinitions autogenerated?
2. You can check this forum thread where a similar topic has been discussed.

Regards,
Didie
Telerik

[Lakshmi]

Thank you for your response.

AutoGeneratePropertyDefinition is true and I am handling this event to assign grouping, display names and also override templates for few of the fields.

In the WPF telerik controls demo, I have seen even a message 'Value xxx could not be converted' when invalid data is entered. Looks like the telerik control internally handles the type conversion errors and throws this message.

In my case, only the Binding item is known at build all other attributes like display name, grouping, which fields are shown and all of the validations are known only at runtime. How can I add the validations dynamically at runtime. Any sample in this regard is highly appreciated.

[Dimitrina]

Hello,

I have attached a sample solution to demonstrate the currently supported validation option. 

Regards,
Didie
Telerik

[Dimitrina]

Hello,

I have additionally extended the attached solution to also illustrate validation for Required fields.

Regards,
Didie
Telerik

[Lakshmi]

Thanks for the sample. My requirement is to add the validations at runtime. Based on selection of few attributes in the form, required fields change.

[Dimitrina]

Hello,

I am afraid you cannot change the [Required] Data Annotations attribute at runtime.
What you can do is to control this through validation extending the implementation of the IDataErrorInfo interface.
You will have to check the values of the additional criteria you have provided to be configured at runtime and then based on it validate a property as required or do not validate it at all. You can refer to the demo I sent on the implementation of the IDataErrorInfo interface.

Regards,
Didie
Telerik

[Gencebay]

Hi,
The solution works for updated properties but we need manually trigger validation when submit - save button clicked!
Each item of PropertyDefinitions should trigger own validation rule(s) without updated source!
How can we do it like this way!
Thanks

[Dimitrina]

Hi,

I am afraid this would not be possible for the time being, what I can suggest you is the approach explained below.

Regards,
Dimitrina
Telerik

 

 

[Gencebay]

public ConfiguredTemplate GetConfigureTemplate(EAVPropertyAndValue item)
        {
            FrameworkElementFactory elmFactory = new FrameworkElementFactory();
            DataTemplate dataTemplate = new DataTemplate();
            Binding propBinding = new Binding
            {
                Mode = BindingMode.TwoWay,
                Source = item,
                Path = new PropertyPath("PropertyValue")
            };

            bool IsRequired = item.EAVPropertyDefinations.IsRequired;
            if (IsRequired)
            {
                propBinding.NotifyOnValidationError = true;
                propBinding.ValidatesOnDataErrors = true;
                propBinding.ValidatesOnExceptions = true;
                propBinding.ValidationRules.Add(new PropertyRequiredValidator(item.PropertyDefinations.ValidationMessage));
                if (!string.IsNullOrWhiteSpace(item.PropertyDefinations.ValidationRegex))
                {
                    propBinding.ValidationRules.Add(new RegexValidationRule(item.PropertyDefinations.ValidationRegex, item.PropertyDefinations.ValidationMessage));
                }
            }

            switch (_metaDataType)
            {
                case MetaDataType.String:
                    elmFactory.Type = typeof(TextBox);
                    elmFactory.SetBinding(TextBox.TextProperty, propBinding);
                    dataTemplate.VisualTree = elmFactory;
                    break;
                case MetaDataType.Date:
                    elmFactory.Type = typeof(RadDateTimePicker);
                    elmFactory.SetValue(RadDateTimePicker.InputModeProperty, InputMode.DatePicker);
                    elmFactory.SetBinding(RadDateTimePicker.SelectedValueProperty, propBinding);
                    dataTemplate.VisualTree = elmFactory;
                    break;
                case MetaDataType.GenericCode:
                    JToken o = JObject.Parse(item.PropertyDefinations.MetaDataSettings);
                    if (o[MetaDataSettings.GenericCodeTypeId] != null)
                    {
                        long id = o[MetaDataSettings.GenericCodeTypeId].Value<long>();
                        var genericCodeType = CacheHelperFunctions.GetAllGenericCodeTypes().Where(c => c.ID == id).FirstOrDefault();
                        var lookups = CacheHelperFunctions.GetAllGenericLookups().Where(x => x.GenericCodeTypeID == id).Select(x => x).ToList();
                        var itemSource = new GenericLookupsComposite
                        {
                            GenericCodeTypeDefinition = genericCodeType.Definition,
                            GenericCodeTypeId = genericCodeType.ID,
                            IdNamePairs = lookups.Select(n => new IdNamePair { ID = n.ID, Name = n.OptionName }).ToList()
                        };

                        Binding sourceBinding = new Binding();
                        sourceBinding.Source = itemSource;
                        sourceBinding.Mode = BindingMode.TwoWay;
                        sourceBinding.Path = new PropertyPath("IdNamePairs");

                        Binding combopropBinding = new Binding
                        {
                            Mode = BindingMode.TwoWay,
                            Source = item,
                            Path = new PropertyPath("PropertyDataValueKeyId"),
                            UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
                        };

                        elmFactory.Type = typeof(RadComboBox);
                        elmFactory.SetBinding(RadComboBox.ItemsSourceProperty, sourceBinding);
                        elmFactory.SetValue(RadComboBox.DisplayMemberPathProperty, "Name");
                        elmFactory.SetValue(RadComboBox.SelectedValuePathProperty, "ID");
                        elmFactory.SetValue(RadComboBox.TextProperty, propBinding);
                        elmFactory.SetBinding(RadComboBox.SelectedValueProperty, combopropBinding);
                        dataTemplate.VisualTree = elmFactory;
                    }
                    break;
                default:
                    break;
            }

            dataTemplate.Seal();
            return new ConfiguredTemplate { DataTemplate = dataTemplate, PropertyBinding = propBinding };
        }

Above code provides EditorTemplate and Dynamic Binding for Telerik WPF PropertyGrid control. We are trying trigger validation for all propertygrid fields to fill with global Validation.ErrorEvent to the ValidationResult list. 
Can we use binding expressions like this or any suggest!?
http://stackoverflow.com/questions/5676202/how-to-force-a-wpf-binding-to-refresh this link sugges

[Dimitrina]

Hello,

You can try using validator.ValidateObject. That way the validation on the bindings will not be raised. Still, if there are validation errors, you can gather them and show them like a validation summary.

Regards,
Dimitrina
Telerik