AuthorList.cs :  » Bloggers » BlogEngine.NET » Controls » C# / CSharp Open Source

#region Using

using System;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.IO;
using BlogEngine.Core;

#endregion

namespace Controls{
  /// <summary>
  /// Builds a authro list.
  /// </summary>
  public class AuthorList : Control
  {

    /// <summary>
    /// Initializes the <see cref="AuthorList"/> class.
    /// </summary>
    static AuthorList()
    {
      Post.Saved += delegate { _Html = null; };
    }

    #region Properties

    private static bool _ShowRssIcon = true;
    /// <summary>
    /// Gets or sets whether or not to show feed icons next to the category links.
    /// </summary>
    public bool ShowRssIcon
    {
      get { return _ShowRssIcon; }
      set
      {
        if (_ShowRssIcon != value)
        {
          _ShowRssIcon = value;
          _Html = null;
        }
      }
    }

    private static object _SyncRoot = new object();

    private static string _Html;
    /// <summary>
    /// Caches the rendered HTML in the private field and first
    /// updates it when a post has been saved (new or updated).
    /// </summary>
    private string Html
    {
      get
      {
        if (_Html == null)
        {
          lock (_SyncRoot)
          {
            if (_Html == null)
            {
              HtmlGenericControl ul = BindAuthors();
              System.IO.StringWriter sw = new System.IO.StringWriter();
              ul.RenderControl(new HtmlTextWriter(sw));
              _Html = sw.ToString();
            }
          }
        }

        return _Html;
      }
    }

    #endregion

    /// <summary>
    /// Loops through all users and builds the HTML
    /// presentation.
    /// </summary>
    private HtmlGenericControl BindAuthors()
    {
      if (Post.Posts.Count == 0)
      {
        HtmlGenericControl p = new HtmlGenericControl("p");
        p.InnerHtml = Resources.labels.none;
        return p;
      }

      HtmlGenericControl ul = new HtmlGenericControl("ul");
      ul.ID = "authorlist";

      foreach (MembershipUser user in Membership.GetAllUsers())
      {
        int postCount = Post.GetPostsByAuthor(user.UserName).Count;
        if (postCount == 0)
          continue;

        HtmlGenericControl li = new HtmlGenericControl("li");

        if (ShowRssIcon)
        {
          HtmlImage img = new HtmlImage();
          img.Src = Utils.RelativeWebRoot + "pics/rssButton.gif";
          img.Alt = "RSS feed for " + user.UserName;
          img.Attributes["class"] = "rssButton";

          HtmlAnchor feedAnchor = new HtmlAnchor();
          feedAnchor.HRef = Utils.RelativeWebRoot + "syndication.axd?author=" + Utils.RemoveIllegalCharacters(user.UserName);
          feedAnchor.Attributes["rel"] = "nofollow";
          feedAnchor.Controls.Add(img);

          li.Controls.Add(feedAnchor);
        }
        
        HtmlAnchor anc = new HtmlAnchor();
        anc.HRef = Utils.RelativeWebRoot + "author/" + user.UserName + BlogSettings.Instance.FileExtension;
        anc.InnerHtml = user.UserName + " (" + postCount + ")";
        anc.Title = "Author: " + user.UserName;

        li.Controls.Add(anc);
        ul.Controls.Add(li);
      }

      return ul;
    }

    /// <summary>
    /// Renders the control.
    /// </summary>
    public override void RenderControl(HtmlTextWriter writer)
    {
      writer.Write(Html);
      writer.Write(Environment.NewLine);
    }
  }
}