CODEWITHSUNDEEP
c#wpfmvvmmvvm-light
L.Baczewski
L.Baczewski

Reputation: 13

How to tell which Button has been clicked, when it's generated dynamically? (MVVM)

I have a SearchResultsViewModel with observable collection of recipe class and a command to show a recipe:

    private ObservableCollection<Recipe> _searchedRecipes;
    public ObservableCollection<Recipe> SearchedRecipes
    {
        get
        {
            return _searchedRecipes;
        }
        set
        {
            _searchedRecipes = value;
            OnPropertyChanged();
        }
    }
    #endregion

    #region Show Recipe Command

    public ICommand ShowRecipeCommand { get { return new RelayCommand(() => 
    ExecuteShowRecipeCommand()); } }

    public void ExecuteShowRecipeCommand()
    {
        _locator.Main.CurrentViewModel = new DisplayRecipeViewModel();
    }
    #endregion

Another ViewModel performs a query and passes results in the constructor of this ViewModel. In XAML part of the SearchResultsViewModel, results are presented as Buttons dynamically. Each Recipe is a Button with it's name as content:

     <StackPanel>
            <ItemsControl ItemsSource="{Binding Path = SearchedRecipes}">
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <Button Content="{Binding Path=Name}" Command="{Binding ShowRecipeCommand}"/>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
            </ItemsControl>
        </StackPanel>

I want ShowRecipeCommand to create new DisplayRecipeViewModel with a View bound to it, displaying the properties of Recipe that was clicked but I don't know how to tell which Button was clicked. Is it possible to do this without code behind ??

Upvotes: 1

Views: 129

Answers (1)

mm8
mm8

Reputation: 169270

You could just move the command property to the Recipe class. Then each Button (or rather each data object that is represented by a Button) has its own command and you always know which one that was clicked.

If the Recipe class is auto-generated by some ORM such as for example Entity Framework, you could create another partial class where you define the command property.

Upvotes: 0

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