Added DisableInstrumentation helper

Author: programcsharp

Griddly.Mvc/GriddlyExtensions.cs

@@ -1,10 +1,13 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using System.Web;
 using System.Web.Mvc;
 using System.Web.Mvc.Html;
 using System.Web.Routing;
+using System.Web.WebPages;
+using System.Web.WebPages.Instrumentation;
 
 namespace Griddly.Mvc
 {
@@ -117,7 +120,7 @@ public static void SetGriddlyDefault<T>(this Controller controller, ref T[] para
         }
 
         public static void SetGriddlyDefault<T>(this Controller controller, ref T?[] parameter, string field, IEnumerable<T> value)
-            where T: struct
+            where T : struct
         {
             if (controller.ControllerContext.IsChildAction)
                 parameter = value.Cast<T?>().ToArray();
@@ -184,5 +187,13 @@ public static string Current(this UrlHelper helper, object routeValues = null, b
 
             return helper.RouteUrl(values);
         }
+
+        static readonly PropertyInfo _instrumentationService = typeof(WebPageExecutingBase).GetProperty("InstrumentationService", BindingFlags.NonPublic | BindingFlags.Instance);
+        static readonly PropertyInfo _isAvailableProperty = typeof(InstrumentationService).GetProperty("IsAvailable");
+
+        public static void DisableInstrumentation(this WebPageExecutingBase page)
+        {
+            _isAvailableProperty.SetValue(_instrumentationService.GetValue(page), false);
+        }
     }
 }