search.cs

微软的.NET论坛的源代码（COOL!!!）

        /// Handles databind for the post body.
        /// </summary>
        /// 
        // ********************************************************************/ 
        private void DataBindPostBody(Object sender, EventArgs e) {
            Label body = (Label) sender;
            DataGridItem container = (DataGridItem) body.NamingContainer;
            Post post = (Post) container.DataItem;
            String postBody = Globals.FormatPostBody(post.Body);

            // We only want to display some of the body
            if (postBody.Length > MaxBodyLengthToDisplay) {
                int whitespace = 0;
                // Clip the body
                postBody = postBody.Substring(0, MaxBodyLengthToDisplay);

                // Find the last occurence of a space
                whitespace = postBody.LastIndexOf(" ");

                // Rebuild postBody string
                postBody = postBody.Substring(0, whitespace) + " ...";
            }

            body.Text = postBody;
        }

        // *********************************************************************
        //  DataBindTitle
        //
        /// <summary>
        /// Handles databind for the post title.
        /// </summary>
        /// 
        // ********************************************************************/ 
        private void DataBindTitle(Object sender, EventArgs e) {
            HyperLink title = (HyperLink) sender;
            DataGridItem container = (DataGridItem) title.NamingContainer;
            Post post = (Post) container.DataItem;

            title.Text = post.Subject;
            title.NavigateUrl = Globals.UrlShowPost + post.PostID;
        }

        // *********************************************************************
        //  DataBindPostDetails
        //
        /// <summary>
        /// Handles databind for the post details, e.g. who and at what time.
        /// </summary>
        /// 
        // ********************************************************************/ 
        private void DataBindPostDetails(Object sender, EventArgs e) {
            HyperLink hyperlink;
            Label label;
            PlaceHolder postDetails = (PlaceHolder) sender;
            DataGridItem container = (DataGridItem) postDetails.NamingContainer;
            Post post = (Post) container.DataItem;
            DateTime postDate;

            // Construct post details
            label = new Label();
            label.CssClass = "normalTextSmall";
            label.Text = "Posted by ";
            postDetails.Controls.Add(label);

            // Author
            hyperlink = new HyperLink();
            hyperlink.CssClass = "normalTextSmall";
            hyperlink.Text = post.Username;
            hyperlink.NavigateUrl = Globals.UrlUserProfile + post.Username;
            postDetails.Controls.Add(hyperlink);

            // Posted on date
            postDate = post.PostDate;
            label = new Label();
            label.CssClass = "normalTextSmall";

            // Is the post an announcement
            if (post.IsAnnouncement) {
                label.Text = " <b>(Announcement)</b>";
            } else if (DateTime.Now < postDate) {
                label.Text = " <b>(Pinned Post)</b>";
            } else {
                label.Text = " on " + post.PostDate.ToString();
            }

            postDetails.Controls.Add(label);
            
        }


        // *********************************************************************
        //  CreateSearchOptionsControl
        //
        /// <summary>
        /// This function returns the control that displays the search options.
        /// </summary>
        /// <returns>Control used to render search options.</returns>
        /// 
        // ********************************************************************/ 
        private Control CreateSearchOptionsControl() {

            Table table;
            TableRow tr;
            TableCell td;
            TableHeaderCell th;
            Button button;
            RequiredFieldValidator fieldValidator;
            CheckBox checkbox;

            // Create a new table and set default properties
            table = new Table();
            table.CssClass = "tableBorder";
            table.CellPadding = 3;
            table.CellSpacing = 1;
            table.Width = Unit.Percentage(100);

            // Column 1 - Search Text
            tr = new TableRow();

            th = new TableHeaderCell();
            th.CssClass = "tableHeaderText";
            th.HorizontalAlign = HorizontalAlign.Left;

            // Search Text
            th.Text = "&nbsp;Search";
            tr.Controls.Add(th);
            table.Controls.Add(tr);

            tr = new TableRow();
            tr.ID = "DisplayAdvancedSearchOptions";
            td = new TableCell();

            // Column 2 - Search Options
            td.Wrap = false;
            td.CssClass = "forumRow";
            td.HorizontalAlign = HorizontalAlign.Center;

            // Forums to search
            forumsToSearch = new DropDownList();
            forumsToSearch.ID = "forumsToSearch";
            forumsToSearch.DataTextField = "Name";
            forumsToSearch.DataValueField = "ForumID";

            // Databind based on postback
            if (!Page.IsPostBack) {
                forumsToSearch.DataSource = Forums.GetAllForums();
                forumsToSearch.DataBind();
            }

            // Add the "All Forums" option if the user is allowed to search all forums
            if (AllowSearchAllForums)
                forumsToSearch.Items.Insert(0, new ListItem("All Forums", "-1"));

            td.Controls.Add(forumsToSearch);

            // White space
            td.Controls.Add(new LiteralControl("&nbsp;"));

            // Results / page
            resultsPerPage = new DropDownList();
            resultsPerPage.Items.Add(new ListItem("10 Results/Page", "10"));
            resultsPerPage.Items.Add(new ListItem("25 Results/Page", "25"));
            resultsPerPage.Items.Add(new ListItem("50 Results/Page", "50"));
            td.Controls.Add(resultsPerPage);

            // White space
            td.Controls.Add(new LiteralControl("&nbsp;"));

            // Posts or Authors
            searchFor = new DropDownList();
            searchFor.Items.Add(new ListItem("Posts", "0"));
            searchFor.Items.Add(new ListItem("Posted By", "1"));
            td.Controls.Add(searchFor);

            // White space
            td.Controls.Add(new LiteralControl("&nbsp;"));

            // Match
            matchingWords = new DropDownList();
            matchingWords.Items.Add(new ListItem("Match All Words", "0"));
            matchingWords.Items.Add(new ListItem("Match Any Words", "1"));
            matchingWords.Items.Add(new ListItem("Match Exact Phrase", "2"));	
            td.Controls.Add(matchingWords);

            tr.Controls.Add(td);

            // Are we displaying advanced search options?
            if (DisplayAdvancedSearch)
                tr.Visible = true;
            else
                tr.Visible = false;

            // Add row1 to table
            table.Controls.Add(tr);


            // Search Box
            tr = new TableRow();

            // Text to search for
            td = new TableCell();
            td.Wrap = false;
            td.CssClass = "forumRow";
            td.HorizontalAlign = HorizontalAlign.Center;

            // Search text box
            textToSearchFor = new TextBox();
            textToSearchFor.ID = "textToSearchFor";
            textToSearchFor.Columns = ContainingTextBoxColumns;
            textToSearchFor.MaxLength = defaultContainingTextBoxMaxLength;
            textToSearchFor.Width = Unit.Pixel(300);
            td.Controls.Add(textToSearchFor);

            // White space
            td.Controls.Add(new LiteralControl("&nbsp;"));

            button = new Button();
            button.Text = defaultSearchButtonText;
            button.Click += new EventHandler(SearchButton_Click);
            td.Controls.Add(button);

            // White space
            td.Controls.Add(new LiteralControl("&nbsp;"));

            // Add the advanced features checkbox
            checkbox = new CheckBox();
            checkbox.Text = "Hide Advanced Options";
            checkbox.CssClass = "normalTextSmall";
            checkbox.AutoPostBack = true;
            checkbox.CheckedChanged += new System.EventHandler(DisplayAdvancedOptions);
            td.Controls.Add(checkbox);

            // Validate the search box
            fieldValidator = new RequiredFieldValidator();
            fieldValidator.CssClass = "validationWarningSmall";
            fieldValidator.ControlToValidate = "textToSearchFor";
            fieldValidator.Display = ValidatorDisplay.Dynamic;
            fieldValidator.ErrorMessage = defaultRFVErrorMessage;
            td.Controls.Add(fieldValidator);
            tr.Controls.Add(td);

            table.Controls.Add(tr);

            return table;
        }

        // *********************************************************************
        //  DisplayAdvancedOptions
        //
        /// <summary>
        /// Event handler raised when the checkbox for displaying advanced options
        /// is clicked.
        /// </summary>
        /// <param name="sender">Checkbox that raised the event</param>
        /// <param name="e">Event arguments from the checkbox</param>
        private void DisplayAdvancedOptions(Object sender, EventArgs e) {
            CheckBox checkbox;
            Control advancedSearch;
            
            // Get the checkbox that raised us
            checkbox = (CheckBox) sender;

            // Get the advanced search option table ro
            advancedSearch = FindControl("DisplayAdvancedSearchOptions");

            // Change setting based on status of checkbox
            if (checkbox.Checked) {
                advancedSearch.Visible = false;
                DisplayAdvancedSearch = false;
            } else {
                advancedSearch.Visible = true;
                DisplayAdvancedSearch = true;
            }
        }

		
        // *********************************************************************
        //  SearchButton_Click
        //
        /// <summary>
        /// This event handler is called when the user clicks on the submit button,
        /// firing off the search.  It resets the DataGrid's CurrentPageIndex to 0
        /// and Displays the Search Results.
        /// </summary>
        // ***********************************************************************/
        private void SearchButton_Click(Object sender, EventArgs e) {
            
            // Exit if the page is invalid
            if (!Page.IsValid) 
                return;

            // set the datagrid to start paging at the beginning
            searchResultsDataGrid.CurrentPageIndex = 0;

            // set the number of Records per page
            searchResultsDataGrid.PageSize = Convert.ToInt32(resultsPerPage.SelectedItem.Value);

            // display the search results
            DisplaySearchResults();

        }

        // *********************************************************************
        //  DisplaySearchResults
        //
        /// <summary>
        /// This function grabs the dataset of search results for the particular page.
        /// If there are records in the DataSet, it is bound to the DataGrid, else
        /// a message is displayed explaining that no results were found.