Kooboo CMS - @Html.FrontHtml().Meta()详解。

下面是代码：

 public virtual IHtmlString Meta()
        {
            AggregateHtmlString htmlStrings = new AggregateHtmlString();
            var htmlMeta = this.PageContext.HtmlMeta;
            if (htmlMeta != null)
            {
                if (!string.IsNullOrEmpty(htmlMeta.Canonical))
                {
                    htmlStrings.Add(new HtmlString(string.Format("<link rel=\"canonical\" href=\"{0}\"/>", Kooboo.StringExtensions.StripAllTags(htmlMeta.Canonical))));
                }
                if (!string.IsNullOrEmpty(htmlMeta.Author))
                {
                    htmlStrings.Add(BuildMeta("author", htmlMeta.Author));
                }

                if (!string.IsNullOrEmpty(htmlMeta.Description))
                {
                    htmlStrings.Add(BuildMeta("description", htmlMeta.Description));
                }

                if (!string.IsNullOrEmpty(htmlMeta.Keywords))
                {
                    htmlStrings.Add(BuildMeta("keywords", htmlMeta.Keywords));
                }
                if (htmlMeta.Customs != null)
                {
                    foreach (var item in htmlMeta.Customs)
                    {
                        htmlStrings.Add(BuildMeta(item.Key, item.Value));
                    }
                }
                if (!string.IsNullOrEmpty(htmlMeta.HtmlMetaBlock))
                {
                    htmlStrings.Add(new HtmlString(htmlMeta.HtmlMetaBlock));
                }
            }
            return htmlStrings;
        }
        private static IHtmlString BuildMeta(string name, string value)
        {
            return new HtmlString(string.Format("<meta name=\"{0}\" content=\"{1}\" />", name, Kooboo.StringExtensions.StripAllTags(value)));
        }

 　　其中的Aggregate的意思是聚合，是个生僻词。我还是觉得我们有必要了解一下AggregateHtmlString这个类吧。按F12进入定义，结果是DLL，搜索这个类名，得到如下代码：

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

namespace Kooboo.CMS.Common
{
    public class AggregateHtmlString : IHtmlString
    {
        List<IHtmlString> list;
        public AggregateHtmlString()
            : this(null)
        {
        }
        public AggregateHtmlString(IEnumerable<IHtmlString> htmlStrings)
        {
            if (htmlStrings != null)
            {
                list = new List<IHtmlString>(htmlStrings);
            }
            else
            {
                list = new List<IHtmlString>();
            }
        }
        public IEnumerable<IHtmlString> HtmlStrings
        {
            get
            {
                return list;
            }
        }
        public void Add(IHtmlString htmlString)
        {
            list.Add(htmlString);
        }
        #region IHtmlString Members

        public string ToHtmlString()
        {
            StringBuilder sb = new StringBuilder();
            foreach (var item in HtmlStrings)
            {
                if (item != null)
                {
                    sb.Append(item.ToHtmlString());
                }
            }
            return sb.ToString();
        }

        #endregion
        public override string ToString()
        {
            return ToHtmlString();
        }
    }
}

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