Command Linking To Value Changed

[Matthew Bailey]

I'm having trouble getting a event to behavior command linked to when my SfNumericUpDown value changes.

I have an SfNumericUpDown within a ListView and I'm having a difficult time interpreting which item in the list I'm working with because I can't figure out which EventName into my EventToCommandBehavior.

Any ideas?

Normally I can do something like this:

<Entry.Behaviors>
     <helper:EventToCommandBehavior
            EventName="ThisWouldBeTheEventForValueChanged"
            Command="{Binding DoSomethingCommand}"
            CommandParameter="{Binding Source={x:Reference ThisIsTheListForReference}}"/>
 </Entry.Behaviors>

[Ramya Soundar Rajan]

Hi Matthew, 

 

Greetings from Syncfusion. 

 

We have achieved your requirement with EventToCommandBehavior for SfNumericUpDown ValueChanged event. Added the SfNumericUpDown control inside the ListView as like in the below code snippet. 

 

[XAML] 

        <ListView x:Name="listView" ItemsSource="{Binding ItemCollection }" ItemSelected="ListView_ItemSelected" ItemTapped="ListView_ItemTapped"> 

            <ListView.ItemTemplate> 

                <DataTemplate> 

                    <ViewCell> 

                        <numeric:SfNumericUpDown x:Name="numericUpDown"  Value="{Binding NumericValue}"> 

                            <numeric:SfNumericUpDown.Behaviors> 

                                <local:EventToCommandBehavior EventName="ValueChanged" Command="{Binding ValueChangedCommand}" CommandParameter="{x:Reference numericUpDown}"/> 

                            </numeric:SfNumericUpDown.Behaviors> 

                        </numeric:SfNumericUpDown> 

                    </ViewCell> 

                </DataTemplate> 

            </ListView.ItemTemplate> 

        </ListView> 

 

 

[C#] 

    public class ViewModel : BindableObject 

    { 

        public IList<Contacts> ItemCollection { get; private set; } 

        public ViewModel() 

        { 

            ItemCollection = new List<Contacts>(); 

            for (int i = 1; i < 10; i++) 

            { 

                ItemCollection.Add(new Contacts() { NumericValue = i }); 

            } 

        } 

    } 

 

    public class Contacts 

    { 

        public Contacts() 

        { 

            ValueChangedCommand = new Command(NumericValueChangedEvent); 

        } 

        private void NumericValueChangedEvent(object args) 

        { 

        } 

        private int numericValue; 

        public int NumericValue 

        { 

            get { return numericValue; } 

            set { numericValue = value; } 

        } 

        public ICommand ValueChangedCommand { get; private set; } 

    } 

 

 

Please let us know if you have any concerns. 

 

Regards, 

Ramya S