Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.DynamicData/UI/DataControlExtensions.cs

@@ -0,0 +1,38 @@
+namespace System.Web.UI {
+    using System;
+    using System.Collections.Concurrent;
+    using System.Collections.Generic;
+    using System.Web.DynamicData;
+
+    public static class DataControlExtensions {
+        private readonly static ConcurrentDictionary<Type, MetaTable> s_MetaTableCache = new ConcurrentDictionary<Type, MetaTable>();
+
+        public static void EnableDynamicData(this INamingContainer control, Type entityType, object defaults) {
+            MetaTable table = GetTableFromCache(entityType);
+            control.SetMetaTable(table, defaults);
+            DynamicDataExtensions.ApplyFieldGenerator(control, table);
+        }
+
+        public static void EnableDynamicData(this INamingContainer control, Type entityType, IDictionary<string, object> defaultValues) {
+            MetaTable table = GetTableFromCache(entityType);
+            control.SetMetaTable(table, defaultValues);
+            DynamicDataExtensions.ApplyFieldGenerator(control, table);
+        }
+
+        public static void EnableDynamicData(this INamingContainer control, Type entityType) {
+            MetaTable table = GetTableFromCache(entityType);
+            control.SetMetaTable(table);
+            DynamicDataExtensions.ApplyFieldGenerator(control, table);
+        }
+
+        private static MetaTable GetTableFromCache(Type entityType) {
+            MetaTable table;
+            if (!s_MetaTableCache.TryGetValue(entityType, out table)) {
+                table = MetaTable.CreateTable(entityType);
+                table.Model.FieldTemplateFactory = new SimpleFieldTemplateFactory();
+                s_MetaTableCache.TryAdd(entityType, table);
+            }
+            return table;
+        }
+    }
+}