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The responsibility of the Assignment object from Figure 3-8 is to manage the association between a project and a resource. This means that the Assignment object s behavior could include the idea of associating a project with a resource. This is a broader behavior than that provided by ProjectResources, which assigns a resource to a project, or by ResourceAssignments, which assigns a project to a resource. In fact, the behavior of Assignment is more general and encompasses the needs of both other objects. Of course, the ProjectResource and ResourceAssignment classes handle the real work of dealing with a resource assigned to a project or with a project associated with a resource. The collection classes really just add and remove these child objects, leaving it to the child objects to handle the details. The end result is that ProjectResource, to fulfill its behavior, can ask Assignment to do the actual work, as shown in Figure 3-9. The same is true of ResourceAssignment. The implication is that Assignment could have a method such as AddAssignment() that accepts a project s Id property and a resource s Id property, along with the role the resource will play on the project.

Tip Object models should be simple and intuitive, even when underlying behaviors are complex. By centralizing common behaviors using objects internal to the business layer, a simpler and more tailored public interface can be exposed to the UI developer.

Figure 3-2. Properties of an assembly reference in Visual Studio The most important property is Copy Local. When this property is set to True, the referenced assembly is copied to the output directory of the referencing project. This output directory depends on the configuration currently selected for the solution.

Similarly, ProjectResource and ResourceAssignment have behaviors that involve removing a resource from a project or removing a project from a resource. Assignment, then, will have a more general behavior to remove an association between a project and a resource. Figure 3-9 shows the full extent of Assignment, including all the methods that implement behaviors common to both ProjectResource and ResourceAssignment.

The UI developer can set this property to True or False to indicate whether the ReadWriteAuthorization control should apply authorization rules to that particular control. You ll see how this works as the control is implemented. The <DesignerCategory()> attribute is just used to help Visual Studio decide what kind of visual designer to use when editing the control. The value used here specifies that the default designer should be used. The class also implements a constructor that accepts an IContainer parameter. This constructor is required for extender controls, and is called by Windows Forms when the control is instantiated. Notice that the control adds itself to the container as required by the Windows Forms infrastructure.

Figure 3-9. Objects collaborating with Assignment At this point, all the common behaviors from ProjectResource and ResourceAssignment have been normalized into a single location in the object model.

When the Copy Local property is set to True, the Copy Local Dependencies and Copy Local Satellite Assemblies properties are inspected as well. The Copy Local Dependencies property can be used to ensure that, together with the referenced assembly, all non-system assemblies that the referencing assembly depends on are copied to the output directory, too. The same can be specified for satellite assemblies, which are assemblies containing language-specific resources. The Use in Build option will usually be set to True. This means that the command-line option /FU is used so that the public types defined in the assembly can be used in the project s source code. If this option is set to False, the assembly will not be referenced at build time. This only makes sense if you set Copy Local to True and intend to load the assembly dynamically.

Part of object design includes reviewing things to ensure that the model won t lead to poor performance. This isn t really a single step in the process but rather something you should do on a continual basis during the whole process. However, once you think the object model is complete, you should always pause to review it for performance issues. One primary performance issue with many object models deals with the use of relational thinking when designing the objects. Normalizing data within the object model is perhaps the most common flaw causing performance issues. Because of the design of ProjectResource, ResourceAssignment, and Assignment, the object model has already eliminated this issue by normalizing behavior instead of data. This helps avoid loading entire business objects just to display a couple of common data elements.

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