#modelbinder

ASP.NET WEB API | TypeConverter and ModelBinders

So its being a while working on WEB API and still it surprises with me everyday with the new way I can extend it. In this article I would like to share TypeConverters and ModelBinders, how they fit into everyday work and how they can make the API access easier for end clients.

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You built an Umbraco (or MVC)  site and it worked perfect on staging server but after pushed it to live server you got the ModelState invalid issue when submitting data.

This is very common issue because not every servers are full support your date format (dd/MM/yyyy in my case). My solution is having a custom date model binder for DateTime and DateTime? type, below is my implementation

public class DateTimeModelBinder : DefaultModelBinder {    private string _customFormat;

   public DateTimeModelBinder(string customFormat)    {        _customFormat = customFormat;    }

   public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)    {        var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);        return DateTime.ParseExact(value.AttemptedValue, _customFormat, CultureInfo.InvariantCulture);    } }

Hooking it up

Now that we have the model binder, we need to associate it with all DateTime properties throughout our application. We do this by adding an instance of the binder to the ModelBinders.Binders collection from within Global.asax.cs.

protected void Application_Start() {    //...    var binder = new DateTimeModelBinder(GetCustomDateFormat());    ModelBinders.Binders.Add(typeof(DateTime), binder);    ModelBinders.Binders.Add(typeof(DateTime?), binder); }

With Umbraco:

using System.Web.Mvc; using System.Globalization; public class CustomEvents : ApplicationEventHandler {        protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)    {     var binder = new DateTimeModelBinder(GetCustomDateFormat());        ModelBinders.Binders.Add(typeof(DateTime), binder);        ModelBinders.Binders.Add(typeof(DateTime?), binder);    } }