Intial

InventoryTraker.Web/ActionResults/BetterJsonResult.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using System.Web.Mvc;
+using InventoryTraker.Web.Utilities;
+
+namespace InventoryTraker.Web.ActionResults
+{
+	public class BetterJsonResult : JsonResult
+	{
+		public IList<string> ErrorMessages { get; private set; }
+
+		public BetterJsonResult()
+		{
+			ErrorMessages = new List<string>();
+		}
+
+		public void AddError(string errorMessage)
+		{
+			ErrorMessages.Add(errorMessage);
+		}
+
+		public override void ExecuteResult(ControllerContext context)
+		{
+			DoUninterestingBaseClassStuff(context);
+
+			SerializeData(context.HttpContext.Response);
+		}
+
+		private void DoUninterestingBaseClassStuff(ControllerContext context)
+		{
+			if (context == null)
+			{
+				throw new ArgumentNullException("context");
+			}
+
+			if (JsonRequestBehavior == JsonRequestBehavior.DenyGet &&
+			    "GET".Equals(context.HttpContext.Request.HttpMethod, StringComparison.OrdinalIgnoreCase))
+			{
+				throw new InvalidOperationException(
+					"GET access is not allowed.  Change the JsonRequestBehavior if you need GET access.");
+			}
+
+			var response = context.HttpContext.Response;
+			response.ContentType = string.IsNullOrEmpty(ContentType) ? "application/json" : ContentType;
+
+			if (ContentEncoding != null)
+			{
+				response.ContentEncoding = ContentEncoding;
+			}
+		}
+
+		protected virtual void SerializeData(HttpResponseBase response)
+		{
+			if (ErrorMessages.Any())
+			{
+				Data = new
+				{
+					ErrorMessage = string.Join("\n", ErrorMessages),
+					ErrorMessages = ErrorMessages.ToArray()
+				};
+
+				response.StatusCode = 400;
+			}
+
+			if (Data == null) return;
+
+			response.Write(Data.ToJson());
+		}
+	}
+
+	public class BetterJsonResult<T> : BetterJsonResult
+	{
+		public new T Data
+		{
+			get { return (T)base.Data; }
+			set { base.Data = value; }
+		}
+	}
+}