Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/Util/AppSettings.cs

@@ -0,0 +1,71 @@
+//---------------------------------------------------------------------
+// <copyright file="ObjectContext.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner       daobando
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+using System.Collections.Specialized;
+using System.Configuration;
+
+namespace System.Data.Entity.Util
+{
+    internal static class AppSettings
+    {
+        private static volatile bool _settingsInitialized = false;
+        private static object _appSettingsLock = new object();
+        private static void EnsureSettingsLoaded()
+        {
+            if (!_settingsInitialized)
+            {
+                lock (_appSettingsLock)
+                {
+                    if (!_settingsInitialized)
+                    {
+                        NameValueCollection settings = null;
+                        try
+                        {
+                            settings = ConfigurationManager.AppSettings;
+                        }
+                        finally
+                        {
+                            if (settings == null || !Boolean.TryParse(settings["EntityFramework_SimplifyLimitOperations"], out _SimplifyLimitOperations))
+                            {
+                                _SimplifyLimitOperations = false;
+                            }
+
+                            if (settings == null || !Boolean.TryParse(settings["EntityFramework_SimplifyUserSpecifiedViews"], out _SimplifyUserSpecifiedViews))
+                            {
+                                _SimplifyUserSpecifiedViews = true;
+                            }
+
+                            _settingsInitialized = true;
+                        }
+                    }
+                }
+            }
+        }
+
+        private static bool _SimplifyLimitOperations = false;
+        internal static bool SimplifyLimitOperations
+        {
+            get
+            {
+                EnsureSettingsLoaded();
+                return _SimplifyLimitOperations;
+            }
+        }
+
+        private static bool _SimplifyUserSpecifiedViews = true;
+        internal static bool SimplifyUserSpecifiedViews
+        {
+            get
+            {
+                EnsureSettingsLoaded();
+                return _SimplifyUserSpecifiedViews;
+            }
+        }
+    }
+}