Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/class/System.Web.Mvc3/Mvc/ViewStartPage.cs

@@ -0,0 +1,40 @@
+namespace System.Web.Mvc {
+    using System.Web.Mvc.Resources;
+    using System.Web.WebPages;
+
+    public abstract class ViewStartPage : StartPage, IViewStartPageChild {
+        private IViewStartPageChild _viewStartPageChild;
+
+        public HtmlHelper<object> Html {
+            get {
+                return ViewStartPageChild.Html;
+            }
+        }
+
+        public UrlHelper Url {
+            get {
+                return ViewStartPageChild.Url;
+            }
+        }
+
+        public ViewContext ViewContext {
+            get {
+                return ViewStartPageChild.ViewContext;
+            }
+        }
+
+        internal IViewStartPageChild ViewStartPageChild {
+            get {
+                if (_viewStartPageChild == null) {
+                    IViewStartPageChild child = base.ChildPage as IViewStartPageChild;
+                    if (child == null) {
+                        throw new InvalidOperationException(MvcResources.ViewStartPage_RequiresMvcRazorView);
+                    }
+                    _viewStartPageChild = child;
+                }
+
+                return _viewStartPageChild;
+            }
+        }
+    }
+}