Enrol GetSchema commands into current transaction (#2876)

Author: edwardneal

src/Microsoft.Data.SqlClient/src/Microsoft/Data/ProviderBase/DbMetaDataFactory.cs

@@ -3,6 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using Microsoft.Data.Common;
+using Microsoft.Data.SqlClient;
 using System;
 using System.Data;
 using System.Data.Common;
@@ -126,8 +127,11 @@ private DataTable ExecuteCommand(DataRow requestedCollectionRow, string[] restri
             }
 
             DbCommand command = connection.CreateCommand();
+            SqlConnection castConnection = connection as SqlConnection;
+
             command.CommandText = sqlCommand;
             command.CommandTimeout = Math.Max(command.CommandTimeout, 180);
+            command.Transaction = castConnection?.GetOpenTdsConnection()?.CurrentTransaction?.Parent;
 
             for (int i = 0; i < numberOfRestrictions; i++)
             {

src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/SqlSchemaInfoTest/SqlSchemaInfoTest.cs

@@ -15,13 +15,27 @@ namespace Microsoft.Data.SqlClient.ManualTesting.Tests
     public static class SqlSchemaInfoTest
     {
         #region TestMethods
-        [ConditionalFact(typeof(DataTestUtility), nameof(DataTestUtility.AreConnStringsSetup))]
-        public static void TestGetSchema()
+        [ConditionalTheory(typeof(DataTestUtility), nameof(DataTestUtility.AreConnStringsSetup))]
+        [InlineData(true)]
+        [InlineData(false)]
+        public static void TestGetSchema(bool openTransaction)
         {
             using (SqlConnection conn = new SqlConnection(DataTestUtility.TCPConnectionString))
             {
                 conn.Open();
-                DataTable dataBases = conn.GetSchema("DATABASES");
+                DataTable dataBases;
+
+                if (openTransaction)
+                {
+                    using (SqlTransaction transaction = conn.BeginTransaction())
+                    {
+                        dataBases = conn.GetSchema("DATABASES");
+                    }
+                }
+                else
+                {
+                    dataBases = conn.GetSchema("DATABASES");
+                }
 
                 Assert.True(dataBases.Rows.Count > 0, "At least one database is expected");