kreta/Kreta.BusinessLogic/Classes/ComboBox/ComboBoxHelper.cs

using System.Collections.Generic;
using System.Linq;

namespace Kreta.BusinessLogic.Classes.ComboBox
{
    public static class ComboBoxHelper
    {
        public static List<GroupComboBoxListItem> ConvertDataToGroup(List<ComboBoxListItem> resourceList, string[] dedicatedOrder = null, bool customThenByOrder = false)
        {
            if (dedicatedOrder == null)
            {
                dedicatedOrder = new string[0];
            }
            var result = new List<GroupComboBoxListItem>();

            var groups = resourceList.OrderBy(a => a.GroupName).Select(a => a.GroupName).Distinct().ToList();

            foreach (var item in dedicatedOrder)
            {
                groups.Remove(item);
            }

            var myOrder = dedicatedOrder.ToList();
            myOrder.AddRange(groups);

            foreach (var item in resourceList)
            {
                int index = myOrder.IndexOf(item.GroupName) + 1;
                result.Add(new GroupComboBoxListItem { GroupName = item.GroupName, Order = index, Text = item.Text, Value = item.Value });
            }

            if (customThenByOrder)
            {
                result = result.OrderBy(c => c.Order).ToList();
            }
            else
            {
                result = result.OrderBy(c => c.Order).ThenBy(c => c.Text).ToList();
            }
            foreach (var item in result.GroupBy(x => new { x.Order }).Select(x => x.First()).ToList())
            {
                item.First = true;
            }

            return result;
        }
        public static List<MultipleOrderGroupComboBoxListItem> ConvertDataToGroupWMultipleOrderColumns(List<MultipleOrderComboBoxListItem> resourceList, string[] dedicatedOrder = null, bool customThenByOrder = false)
        {
            if (dedicatedOrder == null)
            {
                dedicatedOrder = new string[0];
            }
            var result = new List<MultipleOrderGroupComboBoxListItem>();
            var multipleOrderColNumber = 0;

            var groups = resourceList.OrderBy(a => a.GroupName).Select(a => a.GroupName).Distinct().ToList();
            foreach (var item in dedicatedOrder)
            {
                groups.Remove(item);
            }

            var myOrder = dedicatedOrder.ToList();
            myOrder.AddRange(groups);

            foreach (var item in resourceList)
            {
                int index = myOrder.IndexOf(item.GroupName) + 1;
                if (item.MultipleOrderParameterArray != null)
                    multipleOrderColNumber = item.MultipleOrderParameterArray.Length;
                result.Add(new MultipleOrderGroupComboBoxListItem { GroupName = item.GroupName, Order = index, MultipleOrderParameterArray = item.MultipleOrderParameterArray, Text = item.Text, Value = item.Value });
            }

            if (multipleOrderColNumber > 0)
            {
                if (!customThenByOrder)
                    result = result.OrderBy(c => c.Text).ToList();
                for (int i = multipleOrderColNumber - 1; i >= 0; i--)
                {
                    result = result.OrderBy(c => c.MultipleOrderParameterArray[i]).ToList();
                }
                result = result.OrderBy(c => c.Order).ToList();
            }
            else
            {
                result = result.OrderBy(c => c.Order).ThenBy(c => c.Text).ToList();
            }
            foreach (var item in result.GroupBy(x => new { x.Order }).Select(x => x.First()).ToList())
            {
                item.First = true;
            }
            return result;
        }
    }

    public class MultipleOrderComboBoxListItem : ComboBoxListItem
    {
        public string[] MultipleOrderParameterArray { get; set; }
    }
    public class MultipleOrderGroupComboBoxListItem : GroupComboBoxListItem
    {
        public string[] MultipleOrderParameterArray { get; set; }
    }
    public class GroupComboBoxListItem : ComboBoxListItem
    {
        public int Order { get; set; }
        public bool First { get; set; }
    }

    public class ComboBoxListItem
    {
        public string Value { get; set; }
        public string Text { get; set; }
        public string GroupName { get; set; }
    }

    public class ComboListGroup
    {
        public bool Disabled { get; set; }
        public string Name { get; set; }
    }
}