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The child objects may be derived from ReadOnlyBase, but more often they will be simple objects that don t inherit from any CSLA .NET base class. The only requirements for these child objects is that they are implemented with read-only properties and that they are marked as [Serializable()]. The code for a typical read-only collection object looks like this: [Serializable()] class ReadOnlyList : ReadOnlyListBase<ReadOnlyList, ReadOnlyChild> { #region Authorization Rules public static bool CanGetObject() { // TODO: customize to check user role //return ApplicationContext.User.IsInRole(""); return true; } #endregion #region Factory Methods public static ReadOnlyList GetReadOnlyList(string filter) { return DataPortal.Fetch<ReadOnlyList>(new Criteria(filter)); } private ReadOnlyList() { /* require use of factory methods */ } #endregion #region Data Access [Serializable()] private class Criteria { private string _filter; public string Filter { get { return _filter; } } public Criteria(string filter) { _filter = filter; } } private void DataPortal_Fetch(Criteria criteria) { RaiseListChangedEvents = false; IsReadOnly = false; // load values using (SqlDataReader dr = null)

To ensure that the collection can properly undelete objects in case of an undo operation, it needs to keep a list of the objects that have been removed The first step in accomplishing this goal is to maintain an internal list of deleted objects Along with implementing this list, there needs to be a ContainsDeleted() method so that the business or UI logic can find out whether the collection contains a specific deleted object BindingList already includes a Contains() method so that the UI code can ask the collection whether it contains a specific item Since a BusinessListBase collection is unusual in that it contains two lists of objects, it s appropriate to allow client code to ask whether an object is contained in the deleted list as well as in the nondeleted list.

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public class MyEnterpriseServicesProxy : Csla.DataPortalClient.EnterpriseServicesProxy { protected override Csla.Server.Hosts.EnterpriseServicesPortal GetServerObject() { return new MyEnterpriseServicesPortal(); } // proxy implementation provided by base class } All that s required for a subclass is to implement the GetServerObject() method. This method is simple to implement because the assembly references the COM+ component on the server. In this example, the assembly contains a class named MyEnterpriseServicesPortal, which is a subclass of Csla.Server.Hosts.EnterpriseServicesPortal. The CslaDataPortalProxy key in the application config file needs to look like this: <add key="CslaDataPortalProxy" value="MyAssembly.MyEnterpriseProxy,MyAssembly " /> where MyAssembly is the name of the assembly and namespace needed to find the application s custom proxy class.

The list of deleted objects is kept as a List<C> a strongly typed collection of child objects That list is then exposed through a protected property so it is available to subclasses Subclasses have access to the nondeleted items in the collection, so this just follows the same scoping model The list object is created on demand to minimize overhead in the case that no items are ever removed from the collection Given the list for storing deleted child objects, it is possible to implement the methods to delete and undelete objects as needed Deleting a child object is really a matter of marking the object as deleted and moving it from the active list of child objects to DeletedList Undeleting occurs when a child object has restored its state so that it s no longer marked as deleted.

Before a client application can create a subclass of EnterpriseServicesProxy, it needs to create an assembly containing a subclass of EnterpriseServicesPortal. The purpose of this subclass is to provide a unique assembly name for this application within COM+. Where IIS allows you to define numerous virtual roots that expose the same assemblies, COM+ requires different assembly names to achieve isolation between applications. In order to run within the Enterprise Services environment, the class inherits from System. EnterpriseServices.ServicedComponent and has a couple Enterprise Services attributes applied: [EventTrackingEnabled(true)] [ComVisible(true)] public abstract class EnterpriseServicesPortal : ServicedComponent, Server.IDataPortalServer The [EventTrackingEnabled()] attribute ensures that the object reports its status to COM+ so the spinning balls work properly in the management console. The [ComVisible()] attribute is required so the class is exposed as a COM class, allowing COM+ to interact with it as needed. Because EnterpriseServicesPortal is a ServicedComponent, the Csla.dll assembly needs some extra configuration: The Csla project references System.EnterpriseServices.dll. The project/assembly is signed with a key file. The project includes an EnterpriseServicesSettings.cs file with some key attributes. Figure 4-9 shows the project properties page where the key file is specified to sign the assembly. Enterprise Services requires that assemblies be signed before they can run within COM+.

public function test() { $item = $this->getItem(array('id'=>'1')); return !empty($item['firstname']) && ($item['firstname'] == 'John'); }

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