1111111

public static T ReaderToEntity<T>(T objDest, SqlDataReader reader)
        {   
            PropertyInfo[] property = objDest.GetType().GetProperties();
            foreach (PropertyInfo p in property)
            {
                Type t = p.PropertyType;
                if(reader.GetValue(reader.GetOrdinal(p.Name)) != DBNull.Value)
                { 
                if (t == typeof(String) || t == typeof(int) || t == typeof(int?)
                    || t == typeof(long) || t == typeof(long?)
                    || t == typeof(DateTime) || t == typeof(DateTime?) || t == typeof(char) || t == typeof(decimal) || t == typeof(decimal?))
                    p.SetValue(objDest, reader.GetValue(reader.GetOrdinal(p.Name)));
                }
                else
                {
                    p.SetValue(objDest, null);
                }


            }
            return objDest;
}

=====调用
 SqlDataReader reader = cmd.ExecuteReader();
                        if (reader == null || reader.HasRows == false)
                            return null;
                        reader.Read();
                        MileageCalResult.AddParam addParam = new MileageCalResult.AddParam();
                        addParam = MileageCalResult.ReaderToEntity(addParam, reader);
                        MileageCalResult.AnalyseResult analyseResult = new MileageCalResult.AnalyseResult();
                        analyseResult =  MileageCalResult.ReaderToEntity(analyseResult, reader);
                        MileageCalResult obj = new MileageCalResult(addParam, analyseResult);