Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data/System/Data/Common/GreenMethods.cs

@@ -0,0 +1,56 @@
+//------------------------------------------------------------------------------
+// <copyright file="GreenMethods.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+// <owner current="true" primary="false">[....]</owner>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Data.Common;
+using System.Diagnostics;
+using System.Reflection;
+using System.Security.Permissions;
+
+namespace System.Data.Common {
+    internal static class GreenMethods {
+
+        private const string ExtensionAssemblyRef = "System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=" + AssemblyRef.EcmaPublicKey;
+
+        // For performance, we should convert these calls to using DynamicMethod with a Delegate, or 
+        // even better, friend assemblies if its possible; so far there's only one of these per
+        // AppDomain, so we're OK.
+
+        //------------------------------------------------------------------------------
+        // Access to the DbProviderServices type
+        private const string SystemDataCommonDbProviderServices_TypeName = "System.Data.Common.DbProviderServices, " + ExtensionAssemblyRef;
+        internal static Type SystemDataCommonDbProviderServices_Type = Type.GetType(SystemDataCommonDbProviderServices_TypeName, false);
+        
+        //------------------------------------------------------------------------------
+        // Access to the SqlProviderServices class singleton instance;
+        private const string SystemDataSqlClientSqlProviderServices_TypeName = "System.Data.SqlClient.SqlProviderServices, " + ExtensionAssemblyRef;
+        private static FieldInfo SystemDataSqlClientSqlProviderServices_Instance_FieldInfo;
+        
+        internal static object SystemDataSqlClientSqlProviderServices_Instance() {
+            if (null == SystemDataSqlClientSqlProviderServices_Instance_FieldInfo) {
+                Type t = Type.GetType(SystemDataSqlClientSqlProviderServices_TypeName, false);
+
+                if (null != t) {
+                    SystemDataSqlClientSqlProviderServices_Instance_FieldInfo = t.GetField("Instance", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Static);
+                }
+            }
+            object result = SystemDataSqlClientSqlProviderServices_Instance_GetValue();
+            return result;
+        }
+
+        [System.Security.Permissions.ReflectionPermission(System.Security.Permissions.SecurityAction.Assert, MemberAccess=true)]
+        private static object SystemDataSqlClientSqlProviderServices_Instance_GetValue() {
+            object result = null;
+            if (null != SystemDataSqlClientSqlProviderServices_Instance_FieldInfo) {
+                result = SystemDataSqlClientSqlProviderServices_Instance_FieldInfo.GetValue(null);
+            }
+            return result;
+        }
+
+    }
+}