nhibernateGH-3530: Add a DbDataReader for performing direct casts of …

…values returned from the indexer method.

src/NHibernate/AdoNet/DirectCastDbDataReader.cs

@@ -0,0 +1,154 @@
+using System;
+using System.Collections;
+using System.Data.Common;
+using System.Diagnostics.CodeAnalysis;
+
+namespace NHibernate.AdoNet
+{
+	public partial class DirectCastDbDataReader : DbDataReaderWrapper
+	{
+		public DirectCastDbDataReader(DbDataReader dbDataReader) : base(dbDataReader) { }
+
+		public override object this[int ordinal] => DataReader[ordinal];
+
+		public override object this[string name] => DataReader[name];
+
+		public override int Depth => DataReader.Depth;
+
+		public override int FieldCount => DataReader.FieldCount;
+
+		public override bool HasRows => DataReader.HasRows;
+
+		public override bool IsClosed => DataReader.IsClosed;
+
+		public override int RecordsAffected => DataReader.RecordsAffected;
+
+		public override bool GetBoolean(int ordinal)
+		{
+			return (bool) DataReader[ordinal];
+		}
+
+		public override byte GetByte(int ordinal)
+		{
+			return (byte) DataReader[ordinal];
+		}
+
+		public override long GetBytes(int ordinal, long dataOffset, byte[] buffer, int bufferOffset, int length)
+		{
+			return DataReader.GetBytes(ordinal, dataOffset, buffer, bufferOffset, length);
+		}
+
+		public override char GetChar(int ordinal)
+		{
+			return (char) DataReader[ordinal];
+		}
+
+		public override long GetChars(int ordinal, long dataOffset, char[] buffer, int bufferOffset, int length)
+		{
+			return DataReader.GetChars(ordinal, dataOffset, buffer, bufferOffset, length);
+		}
+
+		public override string GetDataTypeName(int ordinal)
+		{
+			return DataReader.GetDataTypeName(ordinal);
+		}
+
+		public override DateTime GetDateTime(int ordinal)
+		{
+			return (DateTime) DataReader[ordinal];
+		}
+
+		public override decimal GetDecimal(int ordinal)
+		{
+			return (decimal) DataReader[ordinal];
+		}
+
+		public override double GetDouble(int ordinal)
+		{
+			return (double) DataReader[ordinal];
+		}
+
+		public override IEnumerator GetEnumerator()
+		{
+			while (DataReader.Read())
+			{
+				yield return this;
+			}
+		}
+
+		public override System.Type GetFieldType(int ordinal)
+		{
+			return DataReader.GetFieldType(ordinal);
+		}
+
+		public override float GetFloat(int ordinal)
+		{
+			return (float) DataReader[ordinal];
+		}
+
+		public override Guid GetGuid(int ordinal)
+		{
+			return (Guid) DataReader[ordinal];
+		}
+
+		public override short GetInt16(int ordinal)
+		{
+			return (short) DataReader[ordinal];
+		}
+
+		public override int GetInt32(int ordinal)
+		{
+			return (int) DataReader[ordinal];
+		}
+
+		public override long GetInt64(int ordinal)
+		{
+			return (long) DataReader[ordinal];
+		}
+
+		public override string GetName(int ordinal)
+		{
+			return DataReader.GetName(ordinal);
+		}
+
+		public override int GetOrdinal(string name)
+		{
+			return DataReader.GetOrdinal(name);
+		}
+
+		public override string GetString(int ordinal)
+		{
+			return (string) DataReader[ordinal];
+		}
+
+		public override object GetValue(int ordinal)
+		{
+			return DataReader.GetValue(ordinal);
+		}
+
+		public override int GetValues(object[] values)
+		{
+			return DataReader.GetValues(values);
+		}
+
+		public override bool IsDBNull(int ordinal)
+		{
+			return DataReader.IsDBNull(ordinal);
+		}
+
+		public override bool NextResult()
+		{
+			return DataReader.NextResult();
+		}
+
+		public override bool Read()
+		{
+			return DataReader.Read();
+		}
+
+		public override void Close()
+		{
+			DataReader.Close();
+		}
+	}
+}

src/NHibernate/Async/AdoNet/DirectCastDbDataReader.cs

@@ -0,0 +1,41 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by AsyncGenerator.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+
+using System;
+using System.Collections;
+using System.Data.Common;
+using System.Diagnostics.CodeAnalysis;
+
+namespace NHibernate.AdoNet
+{
+	using System.Threading.Tasks;
+	using System.Threading;
+