利用反射把Datatable转换成List

Posted 2020-11-24 yinjinli

/// <summary>        /// 利用反射将Datatable转换为List<T>对象        /// </summary>        /// <typeparam name="T">集合</typeparam>        /// <param name="dt"> datatable对象</param>        /// <returns></returns>        public List<T> DataTableToList<T>(DataTable dt) where T : new()        {            //定义集合            List<T> ts = new List<T>();            //定义一个临时变量            string tempName = string.Empty;            //遍历dataTable中的数据行            foreach (DataRow dr in dt.Rows)            {                T t = new T();                //获得此模型的公共属性                PropertyInfo[] propertys = t.GetType().GetProperties();                //遍历该对象的所有属性                foreach (PropertyInfo pi in propertys)                {                    tempName = pi.Name;//将属性名称赋值给临时变量                    //检查datatable是否包含此列(列名==对象的属性名)                    if (dt.Columns.Contains(tempName))                    {                        //取值                          object value = dr[tempName];                        //如果非空，则赋给对象的属性                        if (value != DBNull.Value)                        {                            //这里添加判断的原因:比如double转folat不能隐式转换,而枚举类型又不能使用Convert.ChangeType                            if (pi.PropertyType.IsEnum)                                {                                    pi.SetValue(t, value, null);                                 }                                else                                {                                //ChangeType属于强转可能存在数据丢失,但是pi.PropertyType是对应你类成员的类型                                pi.SetValue(t, Convert.ChangeType(value, pi.PropertyType), null);                                 }                                                         }                    }                }                //对象添加到泛型集合中                ts.Add(t);            }            return ts;          }