MVC小系列（十九）【mvc与站点地图】

我的MvcSiteMap地图主要由实体文件，XML配置文件，C#调用文件组成，当然为了前台调用方法，可以为HtmlHelper添加一个扩展方法

第一步 定义站点地图实体

 public class MvcSiteMap
    {
        [XmlAttribute]
        public int ID { get; set; }
        [XmlAttribute]
        public string Title { get; set; }
        [XmlAttribute]
        public string Url { get; set; }
        [XmlAttribute]
        public int ParnetID { get; set; }
        public MvcSiteMap Parent { get; set; }
    }
    public class MvcSiteMapList 
    {
        public List<MvcSiteMap> MvcSiteMaps { get; set; }
    }

第二步 做个示例的xml

<?xml version="1.0" encoding="utf-8" ?>
<MvcSiteMapList>
  <MvcSiteMaps>
    <MvcSiteMap Title = "根"  Url = "#" ID = "1" ParnetID = "0"></MvcSiteMap>
    <MvcSiteMap Title = "测试网站"  Url = "#" ID = "2" ParnetID = "1"></MvcSiteMap>
    <MvcSiteMap Title = "首页123sadfasdfds"  Url = "/" ID = "3" ParnetID = "2"></MvcSiteMap>
  </MvcSiteMaps>
</MvcSiteMapList>

第三步：地图核心代码

 public class MvcSiteMapFactory
    {
        private static List<MvcSiteMap> siteMapList
        {
            get
            {
                if (string.IsNullOrWhiteSpace(SiteMapString))
                    throw new ArgumentException("请为在web.config中配置SiteMapString节点,以支持网站地图功能");

                return ConfigCache.ConfigFactory.Instance.GetConfig<MvcSiteMapList>(System.Web.HttpContext.Current.Server.MapPath(SiteMapString)).MvcSiteMaps;
            }
        }

        private static string SiteMapString = System.Configuration.ConfigurationManager.AppSettings["SiteMapString"] ?? string.Empty;

        /// <summary>
        /// 生成站点地图
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static MvcHtmlString GeneratorSiteMap(string url)
        {
            StringBuilder str = new StringBuilder();
            List<string> pathList = new List<string>();
            MvcSiteMap current = GetSiteMap(url);
            GetFather(current, pathList);
            pathList.Reverse();
            pathList.ForEach(i =>
            {
                str.AppendFormat("<span style='padding:0 5px;'>{0}</span>>", i);
            });

            string result = str.ToString();
            if (!string.IsNullOrWhiteSpace(result))
                result = result.Remove(str.ToString().Length - 1);

            return MvcHtmlString.Create(result);
        }

        static MvcSiteMap GetSiteMap(string url)
        {
            return siteMapList.FirstOrDefault(i => i.Url == url);
        }
        /// <summary>
        /// 递归找老祖宗
        /// </summary>
        /// <param name="father"></param>
        static void GetFather(MvcSiteMap father, List<string> pathList)
        {
            if (father != null)
            {
                pathList.Add(string.Format("<a href={0}>{1}</a>", father.Url, father.Title));
                father.Parent = siteMapList.FirstOrDefault(i => i.ID == father.ParnetID);
                GetFather(father.Parent, pathList);
            }
        }
    }

第四步：做个扩展

 /// <summary>
    /// 站点地图扩展
    /// </summary>
    public static class MvcSiteMapExtensions
    {
        public static MvcHtmlString GeneratorSiteMap(this HtmlHelper html, string url)
        {
            return MvcSiteMapFactory.GeneratorSiteMap(url);
        }
    }

第五步：前台调用

<div class="sitemap">
   @Html.GeneratorSiteMap(Request.Url.AbsolutePath)
 </div>