GH-3530: Add a DbDataReader for performing direct casts of values returned from the indexer method.

Author: David Ellingsworth

src/NHibernate/Driver/DirectCastDbDataReader.cs

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