/// <summary>        /// DataReader转泛型        /// </summary>        /// <typeparam name="T">传入的实体类</typeparam>        /// <param name="objReader">DataReader对象</param>        /// <returns></returns>        private static  IList<T> ReaderToList<T>(this IDataReader objReader)        {            using (objReader)            {                List<T> list = new List<T>();                //获取传入的数据类型                Type modelType = typeof(T);                //遍历DataReader对象                while (objReader.Read())                {                    //使用与指定参数匹配最高的构造函数，来创建指定类型的实例                    T model = Activator.CreateInstance<T>();                    for (int i = 0; i < objReader.FieldCount; i++)                    {                        //判断字段值是否为空或不存在的值                        if (!IsNullOrDBNull(objReader[i]))                        {                            //匹配字段名                            PropertyInfo pi = modelType.GetProperty(objReader.GetName(i), BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);                            if (pi != null)                            {                                //绑定实体对象中同名的字段                                  pi.SetValue(model, CheckType(objReader[i], pi.PropertyType), null);                            }                        }                    }                    list.Add(model);                }                return list;            }        }        /// <summary>        /// 对可空类型进行判断转换(*要不然会报错)        /// </summary>        /// <param name="value">DataReader字段的值</param>        /// <param name="conversionType">该字段的类型</param>        /// <returns></returns>        private static object CheckType(object value, Type conversionType)        {            if (conversionType.IsGenericType && conversionType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))            {                if (value =http://www.mamicode.com/= null)                    return null;                System.ComponentModel.NullableConverter nullableConverter = new System.ComponentModel.NullableConverter(conversionType);                conversionType = nullableConverter.UnderlyingType;            }            return Convert.ChangeType(value, conversionType);        }        /// <summary>        /// 判断指定对象是否是有效值        /// </summary>        /// <param name="obj"></param>        /// <returns></returns>        private static bool IsNullOrDBNull(object obj)        {            return (obj == null || (obj is DBNull)) ? true : false;        }