postview.cs

微软的.NET论坛的源代码（COOL!!!）

using System;
using System.Drawing;
using System.Collections;
using System.Collections.Specialized;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using AspNetForums;
using AspNetForums.Controls.Moderation;
using AspNetForums.Components;
using System.ComponentModel;
using System.IO;

namespace AspNetForums.Controls {

    // *********************************************************************
    //  PostView
    //
    /// <summary>
    /// This Web controls how posts are displayed.
    /// </summary>
    /// <remarks>
    /// If the user attempts to view a post that has not yet been approved or a post that
    /// does not exist (perhaps one that has been deleted), they will be taken to the appropriate
    /// error message page. If the user attempts to load the control without specifying a PostID
    /// in the PostID property, an Exception is thrown.
    /// </remarks>
    /// 
    // ********************************************************************/    
    [
    ParseChildren(true)	
    ]
    public class PostView : WebControl, INamingContainer {

        Paging pager;
        PostList postList;
        ViewOptions postView = ViewOptions.Flat;
        Forum forum;
        bool defaultShowSignature = true;
        string defaultPostDateTimeFormat = "MMM d, yyyy - h:mm tt";
        int threshHold = 3;
        Control controlTemplate;
        string siteStyle;
        User user;
        DropDownList displayMode;
        DropDownList sortOrder;
        string templateName = "Skin-ShowPostList.ascx";
        ModerationMenu moderationMenu;
        CheckBox emailTracking;

        // *********************************************************************
        //  PostView
        //
        /// <summary>
        /// Class contructor - read in the PostId that was sent via the
        /// QueryString or Post body of the request
        /// </summary>
        /// 
        // ********************************************************************/ 
        public PostView() {

            // If we have an instance of context, let's attempt to
            // get the ForumID so we can save the user from writing
            // the code
            if (null != Context) {

                try {
                    if (null != Context.Request.QueryString["PostID"]) {
                        string postID = Context.Request.QueryString["PostID"];

                        // Contains a #
                        if (postID.IndexOf("#") > 0)
                            postID = postID.Substring(0, postID.IndexOf("#"));

                        this.PostID = Convert.ToInt32(postID);
                    } else if (null != Context.Request.Form["PostId"]) {
                        this.PostID = Convert.ToInt32(Context.Request.Form["PostID"]);
                    }
                } catch (Exception e) {
                    HttpContext.Current.Response.Redirect(Globals.UrlMessage + Convert.ToInt32(Messages.PostDoesNotExist));
                    HttpContext.Current.Response.End();
                }

                // Was a view option passed in via the querystring?
                if (null != Context.Request.QueryString["View"])
                    if (Context.Request.QueryString["View"] == "Threaded")
                        ViewMode = ViewOptions.Threaded;

                // Was a threshhold value passed in
                if (null != Context.Request.QueryString["ThreshHold"])
                    threshHold = Convert.ToInt32(Context.Request.QueryString["ThreshHold"]);

            }

            // Populate get details about the forum we are in
            try {
                forum = Forums.GetForumInfoByPostID(PostID);
            } catch (Components.ForumNotFoundException fnf) {
                HttpContext.Current.Response.Redirect(Globals.UrlMessage + Convert.ToInt32(Messages.UnknownForum));
                HttpContext.Current.Response.End();
            }

        }

        // *********************************************************************
        //  CreateChildControls
        //
        /// <summary>
        /// This event handler adds the children controls. FIrst we apply templates
        /// for this control. We then determine how we render the post items, either threaded
        /// or flat. We also apply templates defined for each of the post item types.
        /// </summary>
        /// 
        // ********************************************************************/ 
        protected override void CreateChildControls() {

            // Attempt to get the user name
            if (Page.Request.IsAuthenticated) {
                user = Users.GetLoggedOnUser();
            }

            // Set the siteStyle for the page
            if (user != null)
                siteStyle = user.SiteStyle;
            else
                siteStyle = Globals.SiteStyle;

            // Set the view mode
            SetViewMode();

            // Call CreateChildControls
            base.CreateChildControls();
        }

        // *********************************************************************
        //  OnPreRender
        //
        /// <summary>
        /// Override OnPreRender and databind
        /// </summary>
        /// 
        // ********************************************************************/ 
        private void SetViewMode() {

            // Render a threaded or flat view
            if (ViewMode == ViewOptions.Threaded) {

                // Attempt to load the control. If this fails, we're done
                try {
                    controlTemplate = Page.LoadControl(Globals.ApplicationVRoot + "/skins/" + Globals.Skin + "/Skins/Skin-ShowPostThreaded.ascx");
                } catch (FileNotFoundException e) {
                    throw new Exception("The user control skins/Skins/Skin-ShowPostThreaded.ascx was not found. Please ensure this file exists in your skins directory");
                }

                // Initialize the control template
                InitializePostThreadViewControlTemplate();

            } else {

                try {
                    controlTemplate = Page.LoadControl(Globals.ApplicationVRoot + "/skins/" + Globals.Skin + "/Skins/" + TemplateName);
                } catch (FileNotFoundException e) {
                    throw new Exception("The user control skins/Skins/" + TemplateName + "was not found. Please ensure this file exists in your skins directory");
                }

                // Initialize the control template
                InitializePostListControlTemplate();

            }

            // Add the control template to the controls collection
            Controls.Add(controlTemplate);

        }

        // *********************************************************************
        //  InitializePostThreadViewControlTemplate
        //
        /// <summary>
        /// Render the post threaded view
        /// </summary>
        /// 
        // ********************************************************************/ 
        private void InitializePostThreadViewControlTemplate() {
            PostThreaded postThreaded;

            // Initialize common display elements
            InitializeCommonTemplateItems();

            // Get the threadview control
            postThreaded = (PostThreaded) controlTemplate.FindControl("ThreadView");
            postThreaded.PostID = PostID;

            // Set the threshhold
            postThreaded.Threshhold = ThreshHoldForThreadedView;

            Controls.Add(controlTemplate);
        }

        private void InitializeCommonTemplateItems() {
            System.Web.UI.WebControls.Image newThreadImage;
            HyperLink forumName;
            HyperLink newThreadLink;

            // Clear the controls collection
            Controls.Clear();

            // Find the forum name link
            forumName = (HyperLink) controlTemplate.FindControl("ForumName");
            if (forumName != null) {
                forumName.Text = forum.Name;
                forumName.NavigateUrl = Globals.UrlShowForum + forum.ForumID;
            }

            // Find the Display Mode control
            displayMode = (DropDownList) controlTemplate.FindControl("DisplayMode");
            if (displayMode != null) {
                displayMode.AutoPostBack = true;
                displayMode.SelectedIndexChanged += new System.EventHandler(DisplayMode_Changed);
            }

            // Find the email tracking option
            emailTracking = (CheckBox) controlTemplate.FindControl("TrackThread");
            if ((user != null) && (emailTracking != null)) {
                emailTracking.Visible = true;

                PostDetails postDetails = Posts.GetPostDetails(PostID, user.Username);
                emailTracking.AutoPostBack = true;
                emailTracking.CheckedChanged += new System.EventHandler(Toggle_ThreadTracking);
                emailTracking.Checked = postDetails.ThreadTracking;
            } else {
                emailTracking.Visible = false;
            }

        // Find the new thread link
        newThreadLink = (HyperLink) controlTemplate.FindControl("NewThreadLinkTop");
        if (newThreadLink != null) {

        newThreadLink.NavigateUrl = Globals.UrlAddNewPost + forum.ForumID;

        // Find the new thread iamge
        newThreadImage = (System.Web.UI.WebControls.Image) controlTemplate.FindControl("NewThreadImageTop");
        if (newThreadImage != null) {
        newThreadImage.ImageUrl = Globals.ApplicationVRoot + "/skins/" + siteStyle + "/images/newthread.gif";