MsAddIns/ExportExcelTest/Models/PrimaryItem.cs

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

namespace CustomOpenAddins.Models
{
    public class BaseItem
    {
        public BaseItem(string name)
        {
            Name = name;
        }

        public string Name { get; }
    }
    /// <summary>
    /// 一级开项
    /// </summary>
    public class PrimaryItem : BaseItem
    {
        public PrimaryItem(string name, SheetTable table) : base(name)
        {
            Table = table;
            SubCategories = new HashSet<SubItem>();
        }
        /// <summary>
        /// 表名
        /// </summary>
        public SheetTable Table { get; set; }
        public SubItem this[int index]
        {
            get => SubCategories.ElementAt(index);
        }

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder($"<主项>{Name};");
            if (SubCategories.Count == 0)
            {
                return sb.Append("无;").ToString();
            }
            foreach (var item in SubCategories)
            {
                sb.AppendLine($"{item}");
            }
            return sb.ToString();
        }
        /// <summary>
        /// 子类项目
        /// </summary>
        public HashSet<SubItem> SubCategories { get; private set; }

        public SubItem AddSub(string subName)
        {
            var sub = new SubItem(subName, this);

            if (SubCategories == null)
            {
                SubCategories = new HashSet<SubItem>();
            }
            SubCategories.Add(sub);
            return sub;
        }
        public void AddSubCategories(List<SubItem> subs)
        {
            if (SubCategories == null)
            {
                SubCategories = new HashSet<SubItem>();
            }

            subs.ForEach(x =>
            {
                x.Primary = this;
                SubCategories.Add(x);
            });
        }
    }
}