/// <summary>
/// Handles the Saved event of the Post control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="BlogEngine.Core.SavedEventArgs"/> instance containing the event data.</param>
private static void PostSaved(object sender, SavedEventArgs e)
{
if (e.Action != SaveAction.Update)
{
return;
}
var post = (Post)sender;
if (RelatedPostsCache.ContainsKey(post.Id))
{
RelatedPostsCache.Remove(post.Id);
}
}
/// <summary>
/// Creates the list of related posts in HTML.
/// </summary>
/// <param name="relatedPosts">
/// The related posts.
/// </param>
private void CreateList(IEnumerable <IPublishable> relatedPosts)
{
var sb = new StringBuilder();
const string LinkFormat = "<a href=\"{0}\">{1}</a>";
const string DescriptionFormat = "<span>{0}</span>";
sb.Append("<div id=\"relatedPosts\">");
sb.Append("<h3>+++</h3>");
sb.Append("<div>");
var count = 0;
foreach (var post in relatedPosts)
{
if (post != this.Item)
{
sb.Append(string.Format(LinkFormat, post.RelativeLink, HttpUtility.HtmlEncode(post.Title)));
if (this.ShowDescription)
{
var description = post.Description;
if (description != null && description.Length > this.DescriptionMaxLength)
{
description = string.Format("{0}...", description.Substring(0, this.DescriptionMaxLength));
}
if (String.IsNullOrEmpty(description))
{
var content = Utils.StripHtml(post.Content);
description = content.Length > this.DescriptionMaxLength
? string.Format("{0}...", content.Substring(0, this.DescriptionMaxLength))
: content;
}
sb.Append(string.Format(DescriptionFormat, description));
}
count++;
}
if (count == this.MaxResults)
{
break;
}
}
sb.Append("</div>");
sb.Append("</div>");
RelatedPostsCache.Add(this.Item.Id, sb.ToString());
}
/// <summary>
/// Outputs server control content to a provided <see cref="T:System.Web.UI.HtmlTextWriter"></see> object and stores tracing information about the control if tracing is enabled.
/// </summary>
/// <param name="writer">
/// The <see cref="T:System.Web.UI.HtmlTextWriter"></see> object that receives the control content.
/// </param>
public override void RenderControl(HtmlTextWriter writer)
{
if (!BlogSettings.Instance.EnableRelatedPosts || this.Item == null)
{
return;
}
if (!RelatedPostsCache.ContainsKey(this.Item.Id))
{
var relatedPosts = Search.FindRelatedItems(this.Item);
if (relatedPosts.Count <= 1)
{
return;
}
this.CreateList(relatedPosts);
}
writer.Write(RelatedPostsCache[this.Item.Id].Replace("+++", this.Headline));
}
