Data Accessing Independent From Database And Entity With ADO.Net

//Copyright 2012, Halil İbrahim Kalyoncu, www.ibrahimkalyoncu.com
//License: BSD
//Contact: halil@ibrahimkalyoncu.com, ibrahimkalyoncu@hotmail.com.tr
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.ComponentModel;

namespace DataAccess.Helper
{
    public class DbTypeConverter
    {
        #region Private Static Fields
        private static Dictionary<Type,DbType> typeMap = new Dictionary<Type, DbType>();
        #endregion

        #region CTOR
        static DbTypeConverter()
        {
            InitTypes();
        }
        #endregion

        #region Private Static Methods
        private static void InitTypes()
        {
            typeMap[typeof(byte)] = DbType.Byte;
            typeMap[typeof(sbyte)] = DbType.SByte;
            typeMap[typeof(short)] = DbType.Int16;
            typeMap[typeof(ushort)] = DbType.UInt16;
            typeMap[typeof(int)] = DbType.Int32;
            typeMap[typeof(uint)] = DbType.UInt32;
            typeMap[typeof(long)] = DbType.Int64;
            typeMap[typeof(ulong)] = DbType.UInt64;
            typeMap[typeof(float)] = DbType.Single;
            typeMap[typeof(double)] = DbType.Double;
            typeMap[typeof(decimal)] = DbType.Decimal;
            typeMap[typeof(bool)] = DbType.Boolean;
            typeMap[typeof(string)] = DbType.String;
            typeMap[typeof(char)] = DbType.StringFixedLength;
            typeMap[typeof(Guid)] = DbType.Guid;
            typeMap[typeof(DateTime)] = DbType.DateTime;
            typeMap[typeof(DateTimeOffset)] = DbType.DateTimeOffset;
            typeMap[typeof(byte[])] = DbType.Binary;
            typeMap[typeof(byte?)] = DbType.Byte;
            typeMap[typeof(sbyte?)] = DbType.SByte;
            typeMap[typeof(short?)] = DbType.Int16;
            typeMap[typeof(ushort?)] = DbType.UInt16;
            typeMap[typeof(int?)] = DbType.Int32;
            typeMap[typeof(uint?)] = DbType.UInt32;
            typeMap[typeof(long?)] = DbType.Int64;
            typeMap[typeof(ulong?)] = DbType.UInt64;
            typeMap[typeof(float?)] = DbType.Single;
            typeMap[typeof(double?)] = DbType.Double;
            typeMap[typeof(decimal?)] = DbType.Decimal;
            typeMap[typeof(bool?)] = DbType.Boolean;
            typeMap[typeof(char?)] = DbType.StringFixedLength;
            typeMap[typeof(Guid?)] = DbType.Guid;
            typeMap[typeof(DateTime?)] = DbType.DateTime;
            typeMap[typeof(DateTimeOffset?)] = DbType.DateTimeOffset;
        }
        #endregion

        #region Public Static Methods
        public static DbType ConvertFromSystemType(Type systemType)
        {
            if (typeMap.ContainsKey(systemType))
                return typeMap[systemType];
            else
                throw new InvalidCastException("The system type is not convertable.");
        }
        #endregion
    }
}