More improvements to registration, leaf input create, and charting

WebCms/Utility/RequireRequestValueAttribute.cs

@@ -0,0 +1,19 @@
+using System.Reflection;
+using System.Web.Mvc;
+
+namespace LeafWeb.WebCms.Utility
+{
+    // stack overflow
+    public class RequireRequestValueAttribute : ActionMethodSelectorAttribute
+    {
+        public RequireRequestValueAttribute(string valueName)
+        {
+            ValueName = valueName;
+        }
+        public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo)
+        {
+            return (controllerContext.HttpContext.Request[ValueName] != null);
+        }
+        public string ValueName { get; private set; }
+    }
+}