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In the current version of Entity Framework, complex types do not leverage change tracking. Changes to complex types will not be reflected in change tracking. This means that if you mark the properties on a complex type as virtual, there is no change-tracking proxy support. All change tracking is snapshot-based. When you delete or update a POCO entity with a complex type without first loading it from the database, you need to be careful to create an instance of the complex type. In Entity Framework, instances of complex types are structurally part of the entity, and null values are not supported. The code in Listing 8-7 illustrates one way to handle deletes. Listing 8-7. Deleting a POCO entity with a complex type int id = 0; using (var context = new EFRecipesEntities()) { var emp = context.Employees.Where(e => e.Name.FirstName.StartsWith("Bill")).FirstOrDefault(); id = emp.EmployeeId; } using (var context = new EFRecipesEntities()) { var empDelete = new Employee { EmployeeId = id, Name = new Name { FirstName = string.Empty, LastName = string.Empty } }; context.Employees.Attach(empDelete); context.Employees.DeleteObject(empDelete); context.SaveChanges(); } In Listing 8-7, we first have to find the EmployeeId of Bill Jordan. Because we are trying to show how we would delete Bill without first loading the entity into the context, we create a new context to illustrate deleting Bill given just his EmployeeId. We need to create an instance of the Employee entity complete with the Name type. Because we are deleting, it doesn t matter much what values we put in for FirstName and LastName. The key is that the Name property is not null. We satisfy this requirement by assigning a new (dummy) instance of Name. We then Attach() the entity and call DeleteObject() and SaveChanges(). This deletes the entity.

(define (userProcesses) (allow process-exec (subPath "/Applications") (subPath "/bin") (subPath "/usr/bin") ) )

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To request greater permissions, first construct an ApplicationPermissions object that contains your desired settings. Everything you include will be displayed to the user as a prompt, regardless of the current setting; you can include all of your required permissions to communicate all your app needs, or only those permissions which are not currently granted so the user doesn t have to review as many. All requested permissions will be requested as VALUE_ALLOW; you cannot request the user to grant you VALUE_PROMPT or VALUE_DENY permissions. After your ApplicationPermissions are configured, issue a request to ApplicationPermissionsManager.invokePermissionsRequest(). This is a synchronous blocking call: your app will suspend while the user reviews your request. By the time it returns, the user has completed his selections. You can inspect the return value to see what he chose: true means all your requests were granted, false means at least one was set to Prompt or Deny . The next example requests a set of permissions that are necessary to run a particular app.

You are using POCO and want to have Entity Framework and the object state manager notified of changes to your objects.

In this example, we are creating a set of access provisions that allow for the execution of programs found in /Applications, /bin, or /usr/bin. These provisions are defined but

ApplicationPermissions requested = new ApplicationPermissions(); requested.addPermission(ApplicationPermissions.PERMISSION_LOCATION_DATA); requested.addPermission(ApplicationPermissions.PERMISSION_INTERNET); requested.addPermission(ApplicationPermissions.PERMISSION_FILE_API); if (permissions.invokePermissionsRequest(requested)) { // Granted, continue running the app. } else { // Denied, show an error and exit. }

Let s say you have a model like the one in Figure 8-6.

are not applied until the privilege block is referenced in the profile. This is done by enclosing the defined name on it s own line enclosed in parenthesis:

Note: The permissions dialog is generated by the operating system, not your app, and so you can invoke a permissions request from a library or other invisible component. Keep in mind that, even when your app really wants certain permissions, the user may not be able to grant them if his IT policy forbids it. Avoid haranguing users for things

Figure 8-6. A model for donors and their donations This model represents donations and donors. Because some donations are anonymous, the relationship between donor and donation is 0..1 to *. We want to make changes to our entities, such as moving a donation from one donor to another, and have Entity Framework and the object state manager notified of these changes. In addition, we want Entity Framework to leverage this notification to fix up any relationships that are affected by changes. In our case, if we change the Donor on a Donation, we want Entity Framework to fix up both sides of the relationship. The code in Listing 8-8 demonstrates how to do this. The key part of Listing 8-8 is that we marked each property as virtual and each collection returning a type of ICollection<T>. This allows Entity Framework to create proxies for our POCO entities that enable change tracking. Listing 8-8. By marking each property as virtual and each collection a type of ICollection<T>, we get proxies that enable change tracking. class Program { static void Main(string[] args) { RunExample(); } static void RunExample() { using (var context = new EFRecipesEntities()) {

(userProcesses)

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