添加项目文件。

ExportExcelTest/Models/PrimaryItem.cs

@@ -0,0 +1,80 @@
+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);
+            });
+        }
+    }
+}
+