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The most interesting thing about NameValueListBase is that it contains a nested class called NameValuePair. NameValuePair is a simple class that exposes Key and Value properties, of types K and V, respectively. It is declared like this: <Serializable()> _ Public Class NameValuePair This class uses a clever side effect of generics, because although NameValuePair itself isn t generic, it is able to use the generic type parameters of NameValueListBase because it is a nested class. Combined, NameValueListBase and NameValuePair make it very easy to create read-only name/value collections that support data binding. These collections are often used to populate combo box or list controls and to implement validation logic where a value is required to exist in a list of known values.

The PropertyInfo(Of T) class supports the storage of metadata about the properties declared in a business class. When you declare a normal property in a business class, it looks something like this: Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property In an editable business object, you ll typically also need to have the property check authorization, run business rules, and do other work. To help simplify this process, CSLA .NET allows you to declare the property using GetProperty() and SetProperty() helper methods: Public Property Name() As String Get Return GetProperty("Name") End Get Set(ByVal value As String) SetProperty("Name", value) End Set End Property The problem with this code is that the GetProperty() and SetProperty() methods need to know what property is being accessed or set so the correct authorization and business rules can be applied. Passing the property name in as a string literal is a maintenance issue. If someone refactors the property name to something like FirstName, the string literals won t be automatically updated. In fact, a detailed manual search through a lot of code might be required to find all the places where that string literal is used. PropertyInfo objects help consolidate this string literal into one location, where the PropertyInfo object is created. Throughout CSLA .NET, any place where a property name is required, you can provide a PropertyInfo object instead: Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name")) Public Property Name() As String Get Return GetProperty(NameProperty) End Get Set(ByVal value As String) SetProperty(NameProperty, value) End Set End Property Unfortunately, there s no way to entirely eliminate the string literal, but this technique allows the literal value to exist exactly one time in your entire class, minimizing the maintenance issue.

1 summarized the evolution from C to C++/CLI In all the different phases of this evolution, new names have been introduced for types, functions, templates, variables, and so on C++ has introduced the concept of namespaces to avoid naming conflicts The CTS supports namespaces for the same reason C++/CLI allows you to manage CTS namespaces with language syntax you already know from C++ As a C++/CLI programmer, chances are good that you have to solve naming conflicts between names of these different phases Many C++ programs written for the Windows platforms use a variety of libraries including the C runtime, the STL, the Win32 API, ATL, and MFC All these libraries include new names Since the FCL also introduces a huge amount of new names, naming conflicts can easily happen The following code shows a simple example: // nameingTroublecpp // compile with "cl /c /clr namingTrouble.

There is, however, another performance issue in the model The ProjectList and ResourceList collection objects, as modeled, retrieve collections of Project and Resource business objects so that some of their data can be displayed in a list Based on the use cases, the user then selects one of the objects and chooses to view, edit, or remove that object From a purely object-oriented perspective, it s attractive to think that you could just load a collection of Project objects and allow the user to pick the one he wants to edit However, this could be very expensive, because it means loading all the data for every Project object, including each project s list of assigned resources, and so forth As the user adds, edits, and removes Project objects, you would potentially have to maintain your collection in memory too.

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