list和datatable相互转化

/// <summary>
        /// list转datatable
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="collection"></param>
        /// <returns></returns>
        public static DataTable ListToDataTable<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;
        }
           
        /// <summary>
        /// datatable转list
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static List<T> DataTableToList<T>(DataTable dt) where T : new()
        {
            List<T> ts = new List<T>();// 定义集合
            Type type = typeof(T); // 获得此模型的类型
            string tempName = "";
            foreach (DataRow dr in dt.Rows)
            {
                T t = new T();
                PropertyInfo[] propertys = t.GetType().GetProperties();// 获得此模型的公共属性
                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)
                        {
                            if(pi.PropertyType == typeof(decimal))
                                pi.SetValue(t, decimal.Parse(value.ToString()), null);
                            else if (pi.PropertyType == typeof(double))
                                pi.SetValue(t, double.Parse(value.ToString()), null);
                            else if (pi.PropertyType == typeof(float))
                                pi.SetValue(t, float.Parse(value.ToString()), null);
                            else if (pi.PropertyType == typeof(int))
                                pi.SetValue(t, int.Parse(value.ToString()), null);
                            else if (pi.PropertyType == typeof(DateTime))
                                pi.SetValue(t, DateTime.Parse(value.ToString()), null);
                            else
                                pi.SetValue(t, value, null);
                        }
                    }
                }
                ts.Add(t);
            }

            return ts;
        }