Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/System/Data/Objects/NextResultGenerator.cs

@@ -0,0 +1,67 @@
+//------------------------------------------------------------------------------
+// <copyright file="NextResultGenerator.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">WillA</owner>
+//------------------------------------------------------------------------------
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+using System.Data.Common.Utils;
+using System.Data.EntityClient;
+using System.Data.Common.Internal.Materialization;
+using System.Data.Metadata.Edm;
+using System.Linq;
+using System.Text;
+
+
+namespace System.Data.Objects
+{
+    internal class NextResultGenerator 
+    {
+        EntityCommand _entityCommand;
+        ReadOnlyMetadataCollection<EntitySet> _entitySets;
+        ObjectContext _context;
+        EdmType[] _edmTypes;
+        int _resultSetIndex;
+        MergeOption _mergeOption;
+
+        internal NextResultGenerator(ObjectContext context, EntityCommand entityCommand, EdmType[] edmTypes, ReadOnlyMetadataCollection<EntitySet> entitySets, MergeOption mergeOption, int resultSetIndex)
+        {
+            _context = context;
+            _entityCommand = entityCommand;
+            _entitySets = entitySets;
+            _edmTypes = edmTypes;
+            _resultSetIndex = resultSetIndex;
+            _mergeOption = mergeOption;
+        }
+
+        internal ObjectResult<TElement> GetNextResult<TElement>(DbDataReader storeReader)
+        {
+            bool isNextResult = false;
+            try
+            {
+                isNextResult = storeReader.NextResult();
+            }
+            catch (Exception e)
+            {
+                if (EntityUtil.IsCatchableExceptionType(e))
+                {
+                    throw EntityUtil.CommandExecution(System.Data.Entity.Strings.EntityClient_StoreReaderFailed, e);
+                }
+                throw;
+            }
+
+            if (isNextResult)
+            {
+                EdmType edmType = _edmTypes[_resultSetIndex];
+                MetadataHelper.CheckFunctionImportReturnType<TElement>(edmType, _context.MetadataWorkspace);
+                return _context.MaterializedDataRecord<TElement>(_entityCommand, storeReader, _resultSetIndex, _entitySets, _edmTypes, _mergeOption);
+            }
+            else
+            {
+                return null; 
+            }
+        }
+    }
+}