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ASP.NET Web Api Validation with Data Annotations

I’ve recently moved a project over Web Api over to ASP.NET Web Api. In doing that I needed to re-implement my validation code. Thanks to the Api being a part of the MVC framework, things are much simpler now.

  Previously I was Explained About  Difference between WCF and Web API and WCF REST and Web Service ,  Repeater Vs. DataList vs. ListView Vs. GridView , IEnumerable VS IQueryable
public class ValidationActionFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext context)
    {
        var modelState = context.ModelState;
        if (!modelState.IsValid)
        {
            dynamic errors = new JsonObject();
            foreach (var key in modelState.Keys)
            {
                var state = modelState[key];
                if (state.Errors.Any())
                {
                    errors[key] = state.Errors.First().ErrorMessage;
                }
            }
            context.Response = new HttpResponseMessage<JsonValue>(
                errors,
                HttpStatusCode.BadRequest);
        }
    }
}
All I need do now is decorate my models appropriately, for example …







public class TellAFriend
{
    [StringLength(100)]
    public string ToName { get; set; }
    [StringLength(100)]
    [Required]
    [RegularExpression(Regexes.EmailPattern, ErrorMessage = "Invalid email address")]
    public string ToEmailAddress { get; set; }
}

I will get a HTTP 400 response with a nice array of key/value pairs in the response body whenever a client sends me bad data.
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