How Can I Effectively Handle Model Binding to a List in ASP.NET MVC 4 During an HttpPost?

Model Binding to a List in MVC 4

Binding an IList to a view in MVC 4 can be a challenge when working with an HttpPost. Consider the following:

ViewModel:

public class MyViewModel
{
   public List<Person> Persons{get;set;}
}

View:

@model MyViewModel

@for( int i = 0; i < Model.Persons.Count(); ++i)
{
    @Html.HiddenFor(m => m.Persons[i].PersonId)
    @Html.EditorFor(m => m.Persons[i].FirstName) 
    @Html.EditorFor(m => m.Persons[i].LastName)         
}

Action:

[HttpPost]public ViewResult(MyViewModel vm)
{
...
}

Key Considerations:

• Only properties with inputs in the form will be available during the post action.
• MVC's model binding only looks for consecutive IDs, so gaps will result in unbound items.
• Conditional hiding of items can lead to binding issues if gaps in the sequence occur.

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