threadlist.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.Components;
using System.ComponentModel;
using System.IO;

namespace AspNetForums.Controls {

    /// <summary>
    /// This control is a specialized datalist that is capable of rendering a list
    /// of threads that are provided through a Threads property.
    /// </summary>
    [
    ParseChildren(true)
    ]
    public class ThreadList : DataList {

        User user;
        String siteStyle;

        // *********************************************************************
        //  CreateChildControls
        //
        /// <summary>
        /// This event handler adds the children controls and is resonsible
        /// for determining the template type used for the control.
        /// </summary>
        /// 
        // ********************************************************************/ 
        protected override void CreateChildControls() {

            // Do we have a user?
            if (Page.Request.IsAuthenticated) {
                user = Users.GetUserInfo(HttpContext.Current.User.Identity.Name, true);
            }

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

            // Viewstate is disabled
            this.EnableViewState = false;

            // Apply Template
            ApplyTemplates();

        }


        // *********************************************************************
        //  RenderHeaderTempalte
        //
        /// <summary>
        /// Renders each the header using a default template
        /// </summary>
        /// 
        // ********************************************************************/
        private Control RenderHeaderTemplate() {
            Table table;
            TableRow tr;
            TableHeaderCell th;

            table = new Table();
            tr = new TableRow();

            // Column 1
            th = new TableHeaderCell();
            th.ColumnSpan = 2;
            th.Height = 25;
            th.CssClass = "tableHeaderText";
            th.HorizontalAlign = HorizontalAlign.Left;
            th.Text = "&nbsp;Thread&nbsp;";
            tr.Controls.Add(th);

            // Column 3
            th = new TableHeaderCell();
            th.CssClass = "tableHeaderText";
            th.Text = "&nbsp;Started By&nbsp;";
            th.HorizontalAlign = HorizontalAlign.Center;
            th.Wrap = false;
            tr.Controls.Add(th);
            
            // Replies Column 
            th = new TableHeaderCell();
            th.CssClass = "tableHeaderText";
            th.Text = "&nbsp;Replies&nbsp;";
            th.HorizontalAlign = HorizontalAlign.Center;
            tr.Controls.Add(th);

            // Views Column
            th = new TableHeaderCell();
            th.CssClass = "tableHeaderText";
            th.Text = "&nbsp;Views&nbsp;";
            th.HorizontalAlign = HorizontalAlign.Center;
            tr.Controls.Add(th);

            // Last Post
            th = new TableHeaderCell();
            th.CssClass = "tableHeaderText";
            th.Text = "&nbsp;Last Post&nbsp;";
            th.HorizontalAlign = HorizontalAlign.Center;
            th.Wrap = false;
            tr.Controls.Add(th);

            table.Controls.Add(tr);

            return table;
        }

        // *********************************************************************
        //  RenderItemTempalte
        //
        /// <summary>
        /// Renders each item using a default template
        /// </summary>
        /// 
        // ********************************************************************/
        private Control RenderItemTemplate() {

            Table table;
            TableRow tr;
            TableCell td;
            LiteralControl literal;
            HyperLink link;
            PlaceHolder placeHolder;
            Label label;

            // Create a new table
            table = new Table();

            // Create a new table row
            tr = new TableRow();

            // Column 1
            td = new TableCell();
            td.Width = 25;
            td.HorizontalAlign = HorizontalAlign.Center;
            td.VerticalAlign = VerticalAlign.Middle;
            td.CssClass = "forumRow";
            System.Web.UI.WebControls.Image img = new System.Web.UI.WebControls.Image();
            img.DataBinding += new System.EventHandler(HandleDataBindingForImage);
            td.Controls.Add(img);
            tr.Controls.Add(td);

            // Column 2
            td = new TableCell();
            td.Height = 25;
            td.CssClass = "forumRow";
            placeHolder = new PlaceHolder();
            placeHolder.DataBinding += new System.EventHandler(HandleDatabindingForPostSubject);
            td.Controls.Add(placeHolder);
            tr.Controls.Add(td);

            // Author Column
            td = new TableCell();
            td.CssClass = "forumRowHighlight";
            td.Width = 100;
            td.HorizontalAlign = HorizontalAlign.Left;
            link = new HyperLink();
            link.CssClass = "linkSmall";
            link.DataBinding += new System.EventHandler(HandleDatabindingForAuthor);
            td.Controls.Add(new LiteralControl("&nbsp"));
            td.Controls.Add(link);
            tr.Controls.Add(td);

            // Replies Column
            td = new TableCell();
            td.CssClass = "forumRowHighlight";
            td.Width = 50;
            td.HorizontalAlign = HorizontalAlign.Center;
            label = new Label();
            label.CssClass = "normalTextSmaller";
            label.DataBinding += new System.EventHandler(HandleDatabindingForTotalReplies);
            td.Controls.Add(label);
            tr.Controls.Add(td);

            // Views Column
            td = new TableCell();
            td.CssClass = "forumRowHighlight";
            td.Width = 50;
            td.HorizontalAlign = HorizontalAlign.Center;
            label = new Label();
            label.CssClass = "normalTextSmaller";
            label.DataBinding += new System.EventHandler(HandleDatabindingForTotalViews);
            td.Controls.Add(label);
            tr.Controls.Add(td);

            // Post Date Column
            td = new TableCell();
            td.CssClass = "forumRowHighlight";
            td.HorizontalAlign = HorizontalAlign.Center;
            td.Width = 140;
            placeHolder = new PlaceHolder();
            placeHolder.DataBinding += new System.EventHandler(HandleDatabindingForPostDetails);
            td.Controls.Add(placeHolder);
            td.Wrap = false;
            tr.Controls.Add(td);
            
            table.Controls.Add(tr);

            return table;
        }

        // *********************************************************************
        //  RenderFooterTempalte
        //
        /// <summary>
        /// Renders each the footer using a default template
        /// </summary>
        /// 
        // ********************************************************************/
        private Control RenderFooterTemplate() {
            Table table;
            TableRow tr;
            TableCell td;

            table = new Table();
            tr = new TableRow();

            // Single column
            td = new TableCell();
            td.CssClass = "forumHeaderBackgroundAlternate";
            td.Text = "&nbsp;";
            td.ColumnSpan = 6;
            tr.Controls.Add(td);

            table.Controls.Add(tr);

            return table;
        }

        // *********************************************************************
        //  ApplyTemplates
        //
        /// <summary>
        /// Applies templates to control the ui generated by the control. If no
        /// template is specified a custom template is used. If a template is found
        /// in the skins directory, that template is loaded and used. If a user defined
        /// template is found, that template takes priority.
        /// </summary>
        /// 
        // ********************************************************************/
        private void ApplyTemplates() {
            string pathToHeaderTemplate;
            string pathToFooterTemplate;
            string pathToItemTemplate;
            string pathToAlternatingItemTemplate;
            string keyForHeaderTemplate;
            string keyForItemTemplate;
            string keyForAlternatingItemTemplate;
            string keyForFooterTemplate;

            // Are we using skinned template?
            if (Page != null) {

                // Set the file paths to where the templates should be found
                keyForHeaderTemplate = siteStyle + "/Templates/ThreadList-Header.ascx";
                keyForItemTemplate = siteStyle + "/Templates/ThreadList-Item.ascx";
                keyForAlternatingItemTemplate = siteStyle + "/Templates/ThreadList-AlternatingItem.ascx";
                keyForFooterTemplate = siteStyle + "/Templates/ThreadList-Footer.ascx";

                // Set the file paths to where the templates should be found
                pathToHeaderTemplate = Globals.ApplicationVRoot + "/Skins/" + keyForHeaderTemplate;
                pathToItemTemplate = Globals.ApplicationVRoot + "/Skins/" + keyForItemTemplate;
                pathToAlternatingItemTemplate = Globals.ApplicationVRoot + "/Skins/" + keyForAlternatingItemTemplate;
                pathToFooterTemplate = Globals.ApplicationVRoot + "/skins/" + keyForFooterTemplate;

                // Attempt to get the skinned header template
                if (HeaderTemplate == null)
                    HeaderTemplate = Globals.LoadSkinnedTemplate(pathToHeaderTemplate, keyForHeaderTemplate, Page);

                // Attempt to get the skinned item template
                if (ItemTemplate == null)
                    ItemTemplate = Globals.LoadSkinnedTemplate(pathToItemTemplate, keyForItemTemplate, Page);

                // Attempt to get the skinned alternating item template
                if (AlternatingItemTemplate == null)
                    AlternatingItemTemplate = Globals.LoadSkinnedTemplate(pathToAlternatingItemTemplate, keyForAlternatingItemTemplate, Page);

                // Attempt to get the footer template
                if (FooterTemplate == null)
                    FooterTemplate = Globals.LoadSkinnedTemplate(pathToFooterTemplate, keyForFooterTemplate, Page);
            }

            // If the item template is null we force our view
            if (ItemTemplate == null) {
                ExtractTemplateRows = true;
                HeaderTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(BuildHeaderTemplate));
                ItemTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(BuildItemTemplate));
                FooterTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(BuildFooterTemplate));
            }
        }

        
        // *********************************************************************
        //  BuildHeaderTemplate
        //
        /// <summary>
        /// This function is called to create the template for the header
        /// </summary>
        /// 
        // ********************************************************************/
        private void BuildHeaderTemplate(Control _ctrl) {

            System.Web.UI.IParserAccessor __parser = ((System.Web.UI.IParserAccessor)(_ctrl));

            __parser.AddParsedSubObject(RenderHeaderTemplate());
            
        }

        // *********************************************************************
        //  BuildItemTemplate
        //
        /// <summary>
        /// This function is called to create the template for the header
        /// </summary>
        /// 
        // ********************************************************************/
        private void BuildItemTemplate(Control _ctrl) {

            System.Web.UI.IParserAccessor __parser = ((System.Web.UI.IParserAccessor)(_ctrl));

            __parser.AddParsedSubObject(RenderItemTemplate());

        }

        // *********************************************************************
        //  BuildFooterTemplate
        //
        /// <summary>
        /// This function is called to create the template for the footer
        /// </summary>
        /// 
        // ********************************************************************/
        private void BuildFooterTemplate(Control _ctrl) {

            System.Web.UI.IParserAccessor __parser = ((System.Web.UI.IParserAccessor)(_ctrl));