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This is just more of the same code you ve seen in previous chapters. It loads the ListBox control with ListItemData objects, each containing a display name and an ID number from the database. That s fine for a list with simple display requirements. But if you look back at Figure 17-4, it s clear we want something a little more interesting for the list of matching items. We want columns, and columns require reasonable data. To store this data, we ll make up a new class, called MatchingItemData, which works just like ListItemData, but has more data fields.
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Private Class MatchingItemData Public ItemID As Integer ' NamedItem.ID Public Title As String Public Subtitle As String Public Author As String Public MediaType As String Public CallNumber As String Public Overrides Function ToString( ) As String ' ----- Build a simple display string. If (Subtitle = "") Then Return Title & ", by " & Author Else Return Title & ": " & Subtitle & ", by " & Author End If End Function End Class
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Since this class will be used only to display matching items on this form, I ve made it a subordinate class within the larger ItemLookup form class. The ToString method outputs the text that appears in the list. We won t generate the actual columnar output until the next chapter. For now, we ll just display the title and author. The PanelMatches and PanelItems panels each include a Lookup button that initiates a new call to PerformLookup based on the item selected in the list. The Lookup button on the PanelItems panel retrieves the selected MatchingItemData object from the list, and performs the new search.
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Private Sub ActItemLookup_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles ActItemLookup.Click ' ----- Look up the item with the selected ID. Dim itemID As Integer ' ----- Ignore if no match is selected. If (MatchingItems.SelectedIndex = -1) Then Return itemID = CType(MatchingItems.SelectedItem, _ MatchingItemData).ItemID
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17: LINQ
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' ----- Perform the lookup. If (PerformLookup(LookupMethods.ByDatabaseID, _ CStr(itemID), False) = False) Then Return ' ----- Store the history. AddLookupHistory(LookupMethods.ByDatabaseID, CStr(itemID)) End Sub
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The call to PerformLookup starts the process all over again.
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Let s say you have a patron with a lot of time on his hands, and he wants to look up the book War and Peace. Starting from InitiateSearch and moving on to the PerformLookup code, the initial title search ( War and Peace ) displays a list of matching titles on the PanelItems panel. The patron locates the book in this list, and clicks the Lookup button, which calls the ActItemLookup_Click event handler. This event handler in turn calls PerformLookup again, this time doing a precise lookup based on a database ID within the NamedItem table. The detail of the item appears on the PanelOneItem panel. (I ll discuss how it s done later in this chapter.) The detail includes a link to Tolstoy, Leo, the long-suffering author of the book. When the patron clicks on this link, it initiates another call to PerformLookup, this time by author ID. We re back to the PanelItems panel, viewing a list of books and other items by Tolstoy, assuming he had time to write anything else. So, the patron now has an experience with three search panels: (1) a general list of titles matching the name War and Peace ; (2) the detail display for the selected War and Peace item; and (3) an items list of books written by Leo Tolstoy. The history feature included in this form lets the patron return to any previous search page, just like the feature in your web browser. It s possible that some of the searches performed could return hundreds of results. We don t want to store all of that content in memory, since it s possible the patron will never use the Back button. Instead, we will do just what your web browser does: store the minimum information needed to perform the query again. Your web browser maintains just the name and URL of visited paths in its back list. (File and image caching is not part of the history feature.) The ItemLookup.vb form needs to store only those values that PerformLookup needs to do the search again: the type of search, and the numeric or text criteria used in the search.
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