recentcomments.cs

来自「个人博客系统」· CS 代码 · 共 154 行

#region Using

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Collections.Generic;
using BlogEngine.Core;

#endregion

namespace Controls
{
  /// <summary>
  /// Builds a category list.
  /// </summary>
  public class RecentComments : Control
  {

    static RecentComments()
    {
      BindComments();
      Post.CommentAdded += delegate { BindComments(); };
      Post.CommentRemoved += delegate { BindComments(); };      
      Post.Saved += new EventHandler<SavedEventArgs>(Post_Saved);
      Comment.Approved += delegate { BindComments(); };
      BlogSettings.Changed += delegate { BindComments(); };
    }

    static void Post_Saved(object sender, SavedEventArgs e)
    {
      if (e.Action == SaveAction.Delete)
        BindComments();
    }

    #region Private fields

    private static object _SyncRoot = new object();
    private static List<Comment> _Comments = new List<Comment>();

    #endregion

    private static void BindComments()
    {
      lock (_SyncRoot)
      {
        _Comments.Clear();
        List<Comment> comments = new List<Comment>();

        foreach (Post post in Post.Posts)
        {
          foreach (Comment comment in post.Comments) 
          {
              if (comment.IsApproved) 
                comments.Add(comment);
          }
        }

        comments.Sort();
        comments.Reverse();
        int counter = 0;

        foreach (Comment comment in comments)
        {
          if (counter == BlogSettings.Instance.NumberOfRecentComments)
            break;

          if (comment.Email == "pingback" || comment.Email == "trackback")
            continue;

          _Comments.Add(comment);
          counter++;
        }

        comments.Clear();
      }
    }

    private string RenderComments()
    {
      HtmlGenericControl ul = new HtmlGenericControl("ul");
      ul.Attributes.Add("class", "recentComments");

      foreach (Comment comment in _Comments)
      {
          if (comment.IsApproved)
          {
              HtmlGenericControl li = new HtmlGenericControl("li");

              // The post title
              HtmlAnchor title = new HtmlAnchor();
              title.HRef = comment.Post.RelativeLink.ToString();
              title.InnerHtml = comment.Post.Title;
              title.Attributes.Add("class", "postTitle");
              li.Controls.Add(title);

              // The comment count on the post
              LiteralControl count = new LiteralControl(" (" + comment.Post.ApprovedComments.Count + ")<br />");
              li.Controls.Add(count);

              // The author
              if (comment.Website != null)
              {
                  HtmlAnchor author = new HtmlAnchor();
                  author.HRef = comment.Website.ToString();
                  author.InnerHtml = comment.Author;
                  li.Controls.Add(author);

                  LiteralControl wrote = new LiteralControl(" " + Resources.labels.wrote + ": ");
                  li.Controls.Add(wrote);
              }
              else
              {
                  LiteralControl author = new LiteralControl(comment.Author + " " + Resources.labels.wrote + ": ");
                  li.Controls.Add(author);
              }

              // The comment body
              int bodyLength = comment.Content.Length <= 50 ? comment.Content.Length : 50;
              LiteralControl body = new LiteralControl(comment.Content.Substring(0, bodyLength) + "... ");
              li.Controls.Add(body);

              // The comment link
              HtmlAnchor link = new HtmlAnchor();
              link.HRef = comment.Post.RelativeLink + "#id_" + comment.Id;
              link.InnerHtml = "[" + Resources.labels.more + "]";
              link.Attributes.Add("class", "moreLink");
              li.Controls.Add(link);

              ul.Controls.Add(li);
          }
  
      }

      StringWriter sw = new StringWriter();
      ul.RenderControl(new HtmlTextWriter(sw));
      return sw.ToString();
    }

    /// <summary>
    /// Renders the control.
    /// </summary>
    public override void RenderControl(HtmlTextWriter writer)
    {
      if (Post.Posts.Count > 0)
      {
        string html = RenderComments();
        writer.Write(html);
        writer.Write(Environment.NewLine);
      }
    }
  }
}