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Figure 5-1. Tracker Reports dashlet There are several reports available in this dashlet, namely: Last Ten Modified Records Show Active Users Active User Count Top User My Weekly Usage My Module Usage My Top Three Modules Used My Cumulative Login Time (this week) Users Cumulative Login Time (this week)

Note The framework in this book doesn t require a relational model, but since that is the most common data storage technology, I focus on it quite a bit. You should remember that the concepts and code shown in this chapter can be used against XML files, object databases, or almost any other data store you are likely to use.

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Recall how the AddWinPart() method sets up the CloseWinPart() method to handle the user control s CloseWinPart event. That event is raised by the user control when it is closed, and MainForm uses the event to properly remove the user control from the Panel control s Controls collection: private void CloseWinPart(object sender, EventArgs e) { WinPart part = (WinPart)sender; part.CloseWinPart -= new EventHandler(CloseWinPart); part.Visible = false; Panel1.Controls.Remove(part); part.Dispose(); if (DocumentCount == 0) { this.DocumentsToolStripDropDownButton.Enabled = false; this.Text = "Project Tracker"; } else { // Find the first WinPart control and set // the main form's Text property accordingly. // This works because the first WinPart // is the active one. foreach (Control ctl in Panel1.Controls) { if (ctl is WinPart) { this.Text = "Project Tracker - " + ((WinPart)ctl).ToString(); break; } } } } When a user control is removed, other work is required as well. The user control s Dispose() method is called and the caption text on MainForm is reset (because there s almost certainly a new active user control now). If there s no longer an active user control, then the caption text is set accordingly. Also notice that the CloseWinPart event is unhooked. This is an important step, because handling an event sets up an object reference behind the scenes, and failing to unhook events can cause memory leaks (by keeping objects in memory when they are no longer needed).

When MainForm is resized, the Panel control s Resize event is automatically raised. The following code handles that event to resize all the hosted user controls: private void Panel1_Resize(object sender, EventArgs e) { foreach (Control ctl in Panel1.Controls) if (ctl is WinPart) ctl.Size = Panel1.ClientSize; }

Before going any further, let s make sure we re in agreement that object models aren t the same as relational models. Relational models are primarily concerned with the efficient storage of data, so that replication is minimized. Relational modeling is governed by the rules of normalization, and almost all databases are designed to meet at least the third normal form. In this form, it s quite likely that the data for any given business concept or entity is split between multiple tables in the database in order to avoid any duplication of data. Object models, on the other hand, are primarily concerned with modeling behavior, not data. It s not the data that defines the object but the role the object plays within your business domain. Every object should have one clear responsibility and a limited number of behaviors focused on fulfilling that responsibility.

The Tracker backend is also very configurable. The Tracker Settings admin panel allows disabling capturing certain Tracker actions, such as tracking page views, session information, performance metrics, and query logging. You can also adjust the slow query time threshold and the amount of time tracker data is stored. The main reason for doing this would be for performance reasons, since operating the full slate of metric tracking can be quite taxing on the system. Since many admins may not be

With the ability to add, remove, and resize user controls, the code in MainForm covers most of the capabilities required. Of course, there s the implementation of the Documents menu itself to consider.

Tip I recommend the book Object Thinking by David West (DV-Microsoft Professional, 2004) for some good insight into behavioral object modeling and design. Though my ideas differ somewhat from those in Object Thinking, I use many of the concepts and language from that book in my own object-oriented design work and in this book.

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