c# winfom从0学习开发开发OA、BPM工作流程与自定义表单系统（二）部门树形结构和下拉框的结构设计

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace OA.Dal
{
    public class DepartmentHelper
    {
        private static string toadd = "├";
        public static void LoadDepartment(ComboBox cbDepartment, TreeView treeView)
        {
            ArrayList list = new ArrayList();
            treeView.Nodes.Clear();
            var departmentList = Bll.Bll_oa_department.GetDataByParentID(0);
            foreach (var u in departmentList)
            {
                int typeId = u.id;
                string typeName = u.name;
                TreeNode node = new TreeNode();
                node.Text = Convert.ToString(typeName);
                node.Name = Convert.ToString(typeId);
                treeView.Nodes.Add(node);
                list.Add(new System.Collections.DictionaryEntry(typeId, toadd + typeName));
                BindData(typeId, node, list);
            }
            treeView.ExpandAll();

            cbDepartment.DataSource = list;
            cbDepartment.DisplayMember = "Value";
            cbDepartment.ValueMember = "Key";
        }

        private static void BindData(int parentId, TreeNode parentNode, ArrayList list)
        {
            var departmentList = Bll.Bll_oa_department.GetDataByParentID(parentId);
            foreach (var u in departmentList)
            {
                int typeId = u.id;
                string typeName = u.name;
                TreeNode node = new TreeNode();
                node.Text = Convert.ToString(typeName);
                node.Name = Convert.ToString(typeId);
                parentNode.Nodes.Add(node);
                toadd += "┴";
                list.Add(new System.Collections.DictionaryEntry(typeId, toadd + typeName));
                BindData(typeId, node, list);
                toadd = toadd.Substring(0, toadd.Length - 1);
            }
        }
    }
}