Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/ModelBinding/KeyValuePairModelBinderUtil.cs

@@ -0,0 +1,26 @@
+namespace System.Web.ModelBinding {
+
+    internal static class KeyValuePairModelBinderUtil {
+
+        public static bool TryBindStrongModel<TModel>(ModelBindingExecutionContext modelBindingExecutionContext, ModelBindingContext parentBindingContext, string propertyName, ModelMetadataProvider metadataProvider, out TModel model) {
+            ModelBindingContext propertyBindingContext = new ModelBindingContext(parentBindingContext) {
+                ModelMetadata = metadataProvider.GetMetadataForType(null, typeof(TModel)),
+                ModelName = ModelBinderUtil.CreatePropertyModelName(parentBindingContext.ModelName, propertyName)
+            };
+
+            IModelBinder binder = parentBindingContext.ModelBinderProviders.GetBinder(modelBindingExecutionContext, propertyBindingContext);
+            if (binder != null) {
+                if (binder.BindModel(modelBindingExecutionContext, propertyBindingContext)) {
+                    object untypedModel = propertyBindingContext.Model;
+                    model = ModelBinderUtil.CastOrDefault<TModel>(untypedModel);
+                    parentBindingContext.ValidationNode.ChildNodes.Add(propertyBindingContext.ValidationNode);
+                    return true;
+                }
+            }
+
+            model = default(TModel);
+            return false;
+        }
+
+    }
+}