Question

i have a issue, I want to Update a value to element which is getting added in a list.

With generic example:-

I have a Model Object:-

public class Model
{
    public int ModelProperty1 { get; set; }

    public int ModelProperty2 { get; set; }

    public int ModelPropertyStatus { get; set; }
}

I have a DTO Object:-

 public class DTO
{
    public int DTOProperty1 { get; set; }

    public int DTOProperty2 { get; set; }

    public int DTOPropertyStatus { get; set; }
}

Now, in my Controller i have a List which adds Model object:-

List<Model> _listOfModel = new List<Model>();

Secondly, i have created a mapping method which maps my Model & DTO

 private Model MapDTOToModel(DTO dto)
    {
        return new Model
        {
            ModelProperty1 = dto.DTOProperty1,
            ModelProperty2 = dto.DTOProperty2
        };
    }

Coming to my Issue:-
I want something like this to work:-
//I want a piece of code that Updates my ModelPropertyStatus after it gets inserted to //List

    _listOfModel.Add(new Model() { ModelPropertyStatus = 1 });

//Here is the piece of code i want to convert:-

            Model model = new Model();
        model.ModelPropertyStatus = 1;
        _listOfModel.Add(MapDTOToModel(model));

To be specific(Updated)
I want something like this:-

_listOfModel.Add(MapDTOToModel() { ModelPropertyStatus = 1 });

Any Suggestions??

Answer 1

You are looking for an ObservableCollection:

Represents a dynamic data collection that provides notifications when items get added, removed, or when the whole list is refreshed.

---

Here’s an example:

public class Model
{
    public int ModelProperty1 { get; set; }
    public int ModelProperty2 { get; set; }
    public int ModelPropertyStatus { get; set; }
}

void Main()
{
    ObservableCollection<Model> _listOfModel = new ObservableCollection<Model>();
    _listOfModel.CollectionChanged += (s, o) =>
    {
        foreach (var m in o.NewItems)
            ((Model)m).ModelPropertyStatus = 1;
    };

    var model = new Model();

    Console.WriteLine("Before add: " + model.ModelPropertyStatus.ToString());

    _listOfModel.Add(model);

    Console.WriteLine("After add: " + model.ModelPropertyStatus.ToString());
}

output:

Before add: 0
After add: 1

---

As you can see, using the CollectionChanged event, the property gets updatet during the insert.