Custom Model Binder for ASP.NET MVC on GET request

Question

I\'ve created a custom MVC Model Binder which gets called for every HttpPost that comes into the server. But does not get called for HttpGet reques

Answer 1

Let's supose you have your own type you want to bind.

public class Person
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    // other properties you need
}

You can create a custom model bind for this specific type, inherithing from DefaultModelBinder, for sample:

public class PersonModelBinder : DefaultModelBinder
{
    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var request = controllerContext.HttpContext.Request;

        int id = Convert.ToInt32(request.QueryString["id"]);
        string name = request.QueryString["name"];
        int age = Convert.ToInt32(request.QueryString["age"]);
        // other properties

        return new Person { Id = id, Name = name, Age = age };
    }
}

In the Global.asax in the Application_Start event, you can registry this model bind, for sample:

// for Person type, bind with the PersonModelBinder
ModelBinders.Binders.Add(typeof(Person), new PersonModelBinder());

In the BindModel method from the PersonModelBinder, make sure you have all parameters in the querystring and give them the ideal treatment.

Since you have this action method:

public ActionResult Test(Person person)
{
  // process...
}

You can access this action with an url something like this:

Test?id=7&name=Niels&age=25