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To integrate a custom principal object with the data portal, the framework provides the Csla. BusinessPrincipalBase class. This class implements the System.Security.Principal.IPrincipal interface, but with the intent that business developers will override the implementation to meet their application requirements: [Serializable()] public class BusinessPrincipalBase : IPrincipal { private IIdentity _identity; public virtual IIdentity Identity { get { return _identity; } } public virtual bool IsInRole(string role) { return false; } protected BusinessPrincipalBase(IIdentity identity) { _identity = identity; } } The Identity property is easy enough, and is a standard implementation. When the principal object is created, an identity object must be supplied, and the Identity property merely returns a reference to that object. The IsInRole() method is used to determine whether the current user is in a given role. When business developers implement custom principal and identity classes, they will write code to retrieve and store the user s list of roles. This means they need to override the IsInRole() method to check that list on request. Because all the real work occurs in the classes implemented by the business developer, this is all the code required in BusinessPrincipalBase.

Listing 12-12 is the final piece: the UI client (Main.fs). It is simple yet powerful. The main form contains an input field and a preview panel where the expressions are rendered on the fly as typed in. When the user presses the Enter key, a new MDI child window is created, and the original, simplified, derived, and final expressions are rendered on it. There is a bit of extra work involved in creating the child windows to make them scrollable. Listing 12-12. The User Interface Client for the Visual Symbolic Differentiation Application #light open Symbolic.Expressions open Symbolic.Expressions.Visual open System.Windows.Forms open System.Drawing

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The BusinessListBase and ReadOnlyListBase classes implemented in 3 provide support for data binding and integration with the rest of the CSLA .NET framework. But they don t support sorting of the data in the collections. This is intentional, as it is better to provide a sorted view of a collection than to try and sort the collection in place. The concept of sorting a collection in place is supported by the IBindingList interface, which is implemented by the BindingList<T> base class. However, BindingList<T> doesn t implement sorting, so the sort-related methods on IBindingList provide no useful behavior. It seems like you would want to be able to just grab any collection and sort it, but that turns out to be quite problematic. The sort methods also allow unsorting by removing the sort. The expectation is that the list will return to its original order. But this implies that the sort algorithm is reversible, which isn t always true. Alternatively, it requires that the collection maintain an internal list of the items in their original order so that order can be restored. Either solution is somewhat complex. There s also the issue of editing the collection while it is sorted. When new items are added, do they go on the end of the list In sorted or unsorted order What happens when you remove the sort,

In the previous chapter, you saw how you can use the DOM to create markup on the fly. In this chapter, you re going to put those techniques into practice. You ll use the DOM to create discrete chunks of markup that can be added to a web page. You can find the finished function files on the downloads page for this book at the friends of ED website, http://friendsofed.com/.

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