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The ApplyAuthorizationRules() method in MainForm is responsible for enabling and disabling menu items. This method is somewhat long and repetitive, so I won t show the whole thing, but here s the code to enable/disable one menu item: this.NewProjectToolStripMenuItem.Enabled = Project.CanAddObject(); Notice how the actual authorization check is delegated to the static method of the Project business class. These methods were discussed in 8, and were implemented specifically to enable scenarios like this. The idea is that MainForm has no idea whether particular users or roles are authorized to add Project objects. Instead, the Project class itself has that knowledge, and MainForm simply asks Project whether the current user is authorized. The end result is good separation of concerns: Project is concerned with whether users can and can t add objects, while MainForm is concerned with the UI details of enabling and disabling controls.

Figure 2-6. Normalizing the customer name required behavior It could be argued that the CustomerName concept should become an object of its own and that this object would implement the behaviors common to the field. While this sounds good in an idealistic

The DoLogin() method in MainForm calls a Login dialog form to collect and authenticate the user s credentials. After gathering credentials from the user, this dialog form will call PTPrincipal.Login() to do the authentication itself. Figure 9-5 shows the Login form layout.

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sense, it has serious performance and complexity drawbacks when implemented on development platforms such as .NET. Creating a custom object for every field in your application can rapidly become overwhelming, and such an approach makes the use of technologies such as data binding very complex. My approach of normalizing the rules themselves provides a workable compromise: providing a high level of code reuse while still offering good performance and allowing the application to take advantage of all the features of the .NET platform. In fact, the idea that a string value is required is so pervasive that it can be normalized to a general StringRequired rule that can be used by any object with a required property anywhere in an application. In 11, I implement a CommonRules class containing several common validation rules of this nature.

When a user is manually, or explicitly, assigned to a team, the user will appear as a member in the Membership column For example, Will and Chris both report to Jim Will is a member of the East team; Chris is a member of the West team As a result, Jim will be an implicit member of both the East and West teams When a user is manually assigned to a team, the user s management reporting hierarchy is implicitly added to the team as well This ensures that members of the user s management hierarchy also have visibility over the records of the user in question Implicit members appear as Member Reports-to in the Membership column However, when a user becomes implicitly part of a team, they cannot be removed manually from the team Instead, you must remove them from the inherited team.

All the work occurs when OK is clicked. At that point, the credentials entered by the user are verified: private void OK_Click(object sender, EventArgs e) { using (StatusBusy busy = new StatusBusy("Verifying credentials...")) { ProjectTracker.Library.Security.PTPrincipal.Login( this.UsernameTextBox.Text, this.PasswordTextBox.Text); } this.Close(); } Notice the use of the StatusBusy object to update the status text and mouse cursor. Also notice the simplicity of this code. Since PTPrincipal.Login() does all the work of authenticating the user, there s just not much work to do in the UI. This is a theme you ll see throughout the rest of the chapter.

If you wanted to use Windows integrated security, you wouldn t need a login form because the client workstation already knows the user s identity. Instead, you would need to add a bit of code to MainForm so that as it loads, the CurrentPrincipal is configured with a WindowsPrincipal object. The following code shows how to detect the authentication mode and adapt to use either Windows or custom authentication appropriately: private void MainForm_Load(object sender, EventArgs e) { if (Csla.ApplicationContext.AuthenticationType == "Windows") AppDomain.CurrentDomain.SetPrincipalPolicy( System.Security.Principal.PrincipalPolicy.WindowsPrincipal); else DoLogin(); if (DocumentCount == 0) this.DocumentsToolStripDropDownButton.Enabled = false; ApplyAuthorizationRules(); } Calling SetPrincipalPolicy() to set the WindowsPrincipal option tells the .NET runtime to return the current WindowsPrincipal object for the CurrentPrincipal property of the Thread.

If object models aren t the same as relational models (or some other data models that we might be using), some mechanism is needed by which data can be translated from the Data Storage and Management layer up into the object-oriented Business layer.

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