ASP.Net应用递归算法案例

案例需求：动态将一个公司各个部门按照部门顺序排列，在页面动态生成列表，并且子级部门需要比父级部门缩进20px。

页面代码：

<div>
<asp:Button ID="btnCreate" runat="server" onclick="btnCreate_Click" Text="生成" />
<asp:Literal ID="Literal1" runat="server"></asp:Literal>
</div>

1、

    public class Department
    {
        public Department(int id, string name, int parentid)
        {
            this.Id = id;
            this.Name = name;
            this.ParentId = parentid;
        }
        public int Id { get; set; }
        public string Name { get; set; }
        public int ParentId { get; set; }
    
    }

        List<Department> listTc = new List<Department>();
        public void LoadData()
        {
            listTc.Add(new Department(1, "财务部", 2));
            listTc.Add(new Department(2, "公司总部", 0));
            listTc.Add(new Department(3, "财务组1", 1));
            listTc.Add(new Department(4, "财务组2", 1));
            listTc.Add(new Department(5, "研发部", 2));
            listTc.Add(new Department(6, "研发组1", 5));
            listTc.Add(new Department(7, "研发组2", 5));
            listTc.Add(new Department(8, "研发组3", 5));
            listTc.Add(new Department(9, "业务部", 2));
            listTc.Add(new Department(10, "业务组1", 9));
            listTc.Add(new Department(11, "业务组2", 9));
            listTc.Add(new Department(12, "业务组3", 9));
            listTc.Add(new Department(13,"研发组1第一小组",6));
            listTc.Add(new Department(14, "业务组1第一小组", 10));
            listTc.Add(new Department(15, "研发组1第二小组", 6));
            listTc.Add(new Department(16, "研发组1第二小组1", 15));
            listTc.Add(new Department(17, "研发组1第二小组2", 15));
        }

        List<Department> tempList = new List<Department>();
        public List<Department> Sort(int parentId)
        {
            var tcList = GetListTC(parentId);
            if (tempList.Count < listTc.Count)
            {
                if (tcList.Count > 0)
                {
                    foreach (var tc in tcList)
                    {
                        if (!tempList.Contains(tc))
                        {
                            tempList.Add(tc);
                            return Sort(tc.Id);
                        }
                    }
                    var t = GetTC(parentId);
                    return Sort(t.ParentId);
                }
                else
                {
                    var tc = GetTC(parentId);
                    return Sort(tc.ParentId);
                }
            }
            else
            { 
                return tempList;
            }
        }

       public int GetLevel(Department tc,int level)
        {
            var t = listTc.Find(o => o.Id == tc.ParentId);
            if (t!=null)
            {
                level++;
                return GetLevel(t,level);
            }
            return level;
        }
        public List<Department> GetListTC(int parentId)
        {
             var list = listTc.FindAll(o =>o.ParentId == parentId);
             return list;   
        }
        public Department GetTC(int id)
        {
            var tc = listTc.Find(o => o.Id == id);
            return tc;
        }
        public string InitHtml(int level, string name)
        {
            string html = string.Empty;
            html += "<li style='margin-left:" + level* 20 + "px'>" + name + "</li>";
            return html;
        }

      public string CreateHtml()
        {
            var list = Sort(0);
       
            string strHtml = string.Empty;
            foreach (var tc in list)
            {
                int lev = GetLevel(tc, 0);
                strHtml += InitHtml(lev, tc.Name);
            }
            return strHtml;
        }

       protected void btnCreate_Click(object sender, EventArgs e)
        {
            LoadData();
            this.Literal1.Text = CreateHtml();
        }

思路：先将数据排序好，根据当前单位的级别数生成li.

页面效果图：

ASP.Net应用递归算法案例

原文：http://blog.csdn.net/zjk20108023/article/details/44597741