How to add to array in C# dynamically

Question

In response to this answer... Access MVC3 Model properties from Javascript in the View I'd like to know how I can construct the data for the view model in that example dynamically, without having to hardcode. i.e. I'd like to be able to do model.Values.Add(...)

Change the Values to be a List<string> instead of string[]. — Steven
– Steven, Commented May 9, 2012 at 19:35

Justin Niessner · Accepted Answer · 2012-05-09 19:34:48Z

3

There's already a dynamic object that you can add your values to...it's called the ViewBag.

There's no point in trying to roll your own since you're already losing the benefits of the strong typed model.

answered May 9, 2012 at 19:34

Justin Niessner

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2 Comments

Steven Over a year ago

If you use the ViewBag you will be losing the benefits of the strongly typed model as well :-)

Justin Niessner Over a year ago

@Steven - That's my point. There's no point in trying to make your own dynamic object since there's no added benefit.

Dmitry S. · Accepted Answer · 2012-05-09 19:53:52Z

1

You can have a model that looks like this

public class MyViewModel()
{
    private readonly List<string> _values = new List<string>();

    public string[] Values { get { return _values.ToArray(); } }

    public void AddValue(string value)
    {
        _values.Add(value);
    }
}

answered May 9, 2012 at 19:53

Dmitry S.

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5 Comments

Dmitry S. Over a year ago

Why would you need a multi-dimensional array to store pairs. How about public Tuple<string, int>[] Values { get { return _values; } } ?

Dmitry S. Over a year ago

private readonly List<Tuple<string, int>> _values = new List<Tuple<string, int>>();

Dmitry S. Over a year ago

The JavaScript/JSON model for the values property will look like [ { "Item1": "A", "Item2": 1 }, { "Item1": "B", "Item2": 2 } ]

Dmitry S. Over a year ago

Try returning Json(model, JsonRequestBehavior.AllowGet) from the controller action instead of the view to see if the model is populated properly.

Dmitry S. Over a year ago

If you are getting a JSON page, that is good. It means the values are populated and serialized properly. Either the model is not getting passed to the view (are you using the right View() method overload in the controller) or there is something going on with the rendering.

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