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cpp" using namespace System; #include <windowsh> This simple source file does not implement any function Will it compile Well, would I ask you this question if the answer was what you expect Try to compile this file with the command line mentioned in the comment and you will get a couple of strange errors telling you something about an IServiceProvider type that you have never written in the few lines of your code Since you compile with /clr, the assembly mscorlib is automatically referenced The mscorlib assembly defines many types in the namespace System The using declaration allows you to use all of these types without the namespace qualifier The interface System::IServiceProvider is one of these types If you include windowsh (the standard header file for the Win32 API), many new types and functions are declared One of these types is the COM interface IServiceProvider.

Practical performance issues dictate that you re better off creating a read-only collection that contains only the information needed to create the user interface (This is one of the primary reasons why CSLA NET includes the ReadOnlyListBase class, which makes it easy to create such objects) This stems from behavioral design The responsibility of a Resource object is to add and edit a valid resource The responsibility of a ResourceList object is to get a read-only list of resources It is clear that these responsibilities are in conflict To use a Resource object as a child of ResourceList, it would need to be read-only yet its whole purpose is to add and edit data! Obviously, ResourceList and ProjectList must contain child objects other than Resource and Project They should contain child objects that contain only the data to be displayed, in read-only format.

These new child objects will have responsibilities appropriate to their purpose ResourceInfo, for instance, will be responsible for returning read-only information about a resource..

Since this type is not declared in the namespace System, this type declaration itself does not cause a naming conflict However, after this COM interface is declared, several other declarations depend on the type name IServiceProvider For example, there are methods using the type IServiceProvider in their signature Since the type name IServiceProvider is ambiguous in this case, the compiler complains Even though these compiler errors look very irritating, it is easy to solve the problem Just write the using declaration after including windowsh, as follows: // noNameingTroublecpp // compile with "cl /c /clr noNamingTroublecpp" #include <windowsh> using namespace System; Since the namespace is opened later in this sample, none of the declarations in windowsh causes naming conflicts To minimize the potential for naming conflicts, it can be useful to reduce the number of names that are visible without namespace qualifiers.

As discussed earlier, if there are common business rules or logic for properties exposed in such read-only objects, the common behaviors should be normalized into another object.

The ProjectInfo object is responsible for providing read-only information about a project, while the ResourceInfo object provides read-only information about a resource. By loading the minimum amount of data required to meet these responsibilities, these objects provide a highperformance solution and follow good behavioral object design.

This can be done in two ways First, you can use using declarations instead of using directives While a using directive introduces all names of a namespace, a using declaration only introduces a special.

The object model has a RoleList object, responsible for providing a read-only list of role data. It also has a Roles object, responsible for editing the list of roles in the application. Although these two objects have very distinct responsibilities, they do have a point of interaction that should be addressed. Though not required by any use case from a user, the RoleList object can, and probably should, be cached. The list of roles won t change terribly often, yet the RoleList object will be used frequently to populate UI controls and to validate data from the user. There s no sense hitting the database every time to get the same data over and over. You ll see how to easily implement the caching in s 17 and 18, but first, there s a design issue to consider: what happens when the user edits the list of roles using the Roles object In such a case, the RoleList object will be inaccurate.

There s a related issue too, which is when another user edits the list of roles. That issue is harder to solve and requires either periodic cache expiration or some mechanism by which the database can notify the client that the roles have changed. Solving this problem is outside the scope of this discussion.

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