DbType与Type之间的转换

1. DbType ==>Type:

public static DbType TypeToDbType(Type t)
{
	DbType dbt;
	try
	{
		dbt = (DbType)Enum.Parse(typeof(DbType), t.Name);
	}
	catch
	{
		dbt = DbType.Object;
	}
	return dbt;
} 

2. Type ==> DbType:

static Type ConvertType(DbType dbType)
{
	Type toReturn = typeof(DBNull);

	switch (dbType)
	{
		case DbType.UInt64:
			toReturn = typeof(UInt64);
			break;

		case DbType.Int64:
			toReturn = typeof(Int64);
			break;

		case DbType.Int32:
			toReturn = typeof(Int32);
			break;

		case DbType.UInt32:
			toReturn = typeof(UInt32);
			break;

		case DbType.Single:
			toReturn = typeof(float);
			break;

		case DbType.Date:
		case DbType.DateTime:
		case DbType.Time:
			toReturn = typeof(DateTime);
			break;

		case DbType.String:
		case DbType.StringFixedLength:
		case DbType.AnsiString:
		case DbType.AnsiStringFixedLength:
			toReturn = typeof(string);
			break;

		case DbType.UInt16:
			toReturn = typeof(UInt16);
			break;

		case DbType.Int16:
			toReturn = typeof(Int16);
			break;

		case DbType.SByte:
			toReturn = typeof(byte);
			break;

		case DbType.Object:
			toReturn = typeof(object);
			break;

		case DbType.VarNumeric:
		case DbType.Decimal:
			toReturn = typeof(decimal);
			break;

		case DbType.Currency:
			toReturn = typeof(double);
			break;

		case DbType.Binary:
			toReturn = typeof(byte[]);
			break;

		case DbType.Double:
			toReturn = typeof(Double);
			break;

		case DbType.Guid:
			toReturn = typeof(Guid);
			break;

		case DbType.Boolean:
			toReturn = typeof(bool);
			break;
	}

	return toReturn;
}