KeyPairValue in ASP.NET MVC3 Razor

Question

I have a weird problem.

I'm making dynamic form in Razor. I'm using dictionary to store dynamically added inputs. I generate code like that:

<input type="hidden" value="96" name="Inputs[0].Key">
<input type="text" name="Inputs[0].Value">

I receive in my controller this dictionary. It always has as many elements that I added, but all of them are empty.

This is part of my model:

public class MetriceModelTaskSchedule
{
     public IEnumerable<KeyValuePair<long, string>> Inputs { get; set; }
}

What can be wrong here?

Perhaps you have missed get the code?

Lobo
– Lobo

2013-02-18 15:26:01 +00:00
Commented Feb 18, 2013 at 15:26 — Lobo
– Lobo, Commented Feb 18, 2013 at 15:26
ok, now I can see the code.

Lobo
– Lobo

2013-02-18 15:28:09 +00:00
Commented Feb 18, 2013 at 15:28 — Lobo
– Lobo, Commented Feb 18, 2013 at 15:28

Darin Dimitrov · Accepted Answer · 2013-02-18 15:32:33Z

3

What can be wrong here?

The fact that the KeyValuePair<TKey, TValue> class has the Key and Value properties which are readonly. They do not have a setter meaning that the model binder simply cannot set their value.

So as always start by defining a view model:

public class InputViewModel
{
    public long Key { get; set; }
    public string Value { get; set; }
}

and then:

public class MetriceModelTaskSchedule
{
    public IEnumerable<InputViewModel> Inputs { get; set; }
}

Alternatively you could use a Dictionary:

public class MetriceModelTaskSchedule
{
    public IDictionary<long, string> Inputs { get; set; }
}

Also make sure that you have respected the standard naming convention for your input fields in the view so that the model binder can successfully bind them to your model:

<div>
    <input type="text" name="Inputs[0].Key" value="1" />
    <input type="text" name="Inputs[0].Value" value="value 1" />
</div>
<div>
    <input type="text" name="Inputs[1].Key" value="2" />
    <input type="text" name="Inputs[1].Value" value="value 2" />
</div>
...

edited Feb 18, 2013 at 15:32

answered Feb 18, 2013 at 15:27

Darin Dimitrov

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3 Comments

Paweł Reszka Over a year ago

I did as you wrote (I added additional model) and I still have 0 for every Key and null for every Value.

Darin Dimitrov Over a year ago

Then you probably didn't respect the naming convention for your input fields. Please read the article I have linked to in my answer and make sure that your input fields are named accordingly when you inspect the HTML of your page.

Paweł Reszka Over a year ago

Oh, yeah, it was that. I was doing it correctly, but when I was searching for mistakes I made another mistake. Thank you for your help!

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