DataTable和List互轉

   /// <summary>
        /// list轉datatable
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="collection"></param>
        /// <returns></returns>
        public  DataTable  ListToDt<T>(IEnumerable<T> collection)
        {
            var props = typeof(T).GetProperties();
            var dt = new DataTable();
            dt.Columns.AddRange(props.Select(p => new DataColumn(p.Name, p.PropertyType)).ToArray());
            if (collection.Count() > 0)
            {
                for (int i = 0; i < collection.Count(); i++)
                {
                    ArrayList tempList = new ArrayList();
                    foreach (PropertyInfo pi in props)
                    {
                        object obj = pi.GetValue(collection.ElementAt(i), null);
                        tempList.Add(obj);
                    }
                    object[] array = tempList.ToArray();
                    dt.LoadDataRow(array, true);
                }
            }
            return dt;
        }

 public class DtToList<T> where T : new()  
    {
        /// <summary>
        /// datatable轉list
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static  List<T> ConvertToModel(DataTable dt)
        {

            List<T> ts = new List<T>();// 定義集合
            Type type = typeof(T); // 獲得此模型的類型
            string tempName = "";
            foreach (DataRow dr in dt.Rows)
            {
                T t = new T();
                PropertyInfo[] propertys = t.GetType().GetProperties();// 獲得此模型的公共屬性
                foreach (PropertyInfo pi in propertys)
                {
                    tempName = pi.Name;
                    if (dt.Columns.Contains(tempName))
                    {
                        if (!pi.CanWrite) continue;
                        object value = dr[tempName];
                        if (value != DBNull.Value)
                            pi.SetValue(t, value, null);
                    }
                }
                ts.Add(t);
            }
            return ts;
        }
    }