using Mesnac.Action.ChemicalWeighing;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace Mesnac.Action.ChemicalWeighing
{
    public static class DataTableHelper 
    {
        #region DataTable 转换成泛型List
        /// <summary>
        /// DataTable 转换成泛型List
        /// </summary>
        /// <typeparam name="T">实体对象类</typeparam>
        /// <param name="dt">数据DatatTable</param>
        /// <param name="objList">List集合</param>
        /// <param name="isNullEmpty">空字符是否需要</param>
        /// <returns>List<实体对象></returns>
        public static List<Hw_WareHouseSubView> DataTableToList(this DataTable dt, List<Hw_WareHouseSubView> objList = null, bool isNullEmpty = true)
        {
            if (dt == null)
            {
                objList = null;
            }
            if (objList == null)
            {
                objList = new List<Hw_WareHouseSubView>();
            }
            var columnNames = dt.Columns.Cast<DataColumn>().Select(c => c.ColumnName).ToList();
            var properties = typeof(Hw_WareHouseSubView).GetProperties();
            object value = null;
            foreach (DataRow row in dt.Rows)
            {
                var t = Activator.CreateInstance<Hw_WareHouseSubView>();
                {
                    foreach (PropertyInfo pro in properties)
                    {
                        if (!pro.CanWrite)
                        {
                            continue;
                        }
                        if (dt.Columns.Contains(pro.Name.ToUpper()))
                        {
                            value = row[pro.Name];
                            if (value is System.DBNull)
                            {
                                value = null;
                                if (pro.PropertyType.FullName == "System.String")
                                {
                                    value = string.Empty;
                                }
                            }
                            if (isNullEmpty)
                            {
                                if (pro.PropertyType.FullName == "System.String" && string.IsNullOrEmpty(value.ToString().Trim()))
                                {
                                    value = string.Empty;
                                }
                            }
                            if (pro.PropertyType.IsGenericType
                                && pro.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>)
                                && value != null)
                            {
                                pro.SetValue(t, Convert.ChangeType(value, Nullable.GetUnderlyingType(pro.PropertyType)), null);
                            }
                            else if (pro.PropertyType.IsEnum)
                            {
                                pro.SetValue(t, Convert.ChangeType(value, Enum.GetUnderlyingType(pro.PropertyType)), null);
                            }
                            else
                            {
                                pro.SetValue(t, value, null);
                            }
                        }
                    }
                }
                objList.Add(t);
            }
            return objList;
        }

        #endregion
    }
}