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Listing 14-1. Template-generated SimpleWinService.cpp #include "stdafx.h" #include <string.h> #include "SimpleWinService.h" using using using using namespace namespace namespace namespace Simple; System::Text; System::Security::Policy; System::Reflection;

You can implement the System.ComponentModel.INotifyPropertyChanged interface, which requires a single event named PropertyChanged. You must then raise the PropertyChanged event whenever a property changes and indicate which property has changed by supplying the property name as a string. It s still up to you to raise this event when a property changes, but you don t need to define a separate event for each property. The first approach relies on the WPF dependency property infrastructure, while both the second and the third rely on events. Usually, when creating a data object, you ll use the third approach. It s the simplest choice for nonelement classes.

s Note C/C++ code analysis engages a separate code analysis tool for unmanaged code. This is covered in

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//To install/uninstall the service, type: "Simple.exe -Install [-u]" int _tmain(int argc, _TCHAR* argv[]) { if (argc >= 2) { if (argv[1][0] == _T('/')) { argv[1][0] = _T('-'); } if (_tcsicmp(argv[1], _T("-Install")) == 0) { array<String^>^ myargs = System::Environment::GetCommandLineArgs(); array<String^>^ args = gcnew array<String^>(myargs->Length - 1); // Set args[0] with the full path to the assembly, Assembly^ assem = Assembly::GetExecutingAssembly(); args[0] = assem->Location; Array::Copy(myargs, 2, args, 1, args->Length - 1); AppDomain^ dom = AppDomain::CreateDomain(L"execDom"); Type^ type = System::Object::typeid; String^ path = type->Assembly->Location; StringBuilder^ sb = gcnew StringBuilder(path->Substring(0, path->LastIndexOf(L"\\"))); sb->Append(L"\\InstallUtil.exe"); Evidence^ evidence = gcnew Evidence(); dom->ExecuteAssembly(sb->ToString(), evidence, args); } } else { ServiceBase::Run(gcnew SimpleWinService()); } } Ugly, don t you think

s Note You can actually use one other approach. If you suspect a change has been made to a bound object

13.

and that bound object doesn t support change notifications in any of the proper ways, you can retrieve the BindingExpression object (using the FrameworkElement.GetBindingExpression() method) and call BindingExpression.UpdateTarget() to trigger a refresh. Obviously, this is the most awkward solution you can almost see the duct tape that s holding it together.

This code is really mostly legacy code from the Managed Extensions for C++ days due to Managed C++ s not being able to generate safe code. You used to need all this code to magically build a command to fool Windows into believing the code is safe. Now with C++/CLI, since safe code can be generated, most of this code can be thrown away. However, it s probably a good thing to keep this code in your arsenal if you plan on writing a Windows service that isn t safe. (You ll learn about unsafe code in s 20 and 21.) On the other hand, if you plan on using safe code, then Listing 14-2 shows how I would change the preceding code. Listing 14-2. Conversion of SimpleWinService.cpp for Safe Code #include "stdafx.h" #include "SimpleWinService.h" using namespace Simple; using namespace System::Collections; using namespace System::ServiceProcess; void main() { array<ServiceBase^>^ ServicesToRun; // More than one user service may run within the same process. To add // another service to this process, change the following line to // create a second service object. For example, // // ServicesToRun = gcnew array<ServiceBase^> // { // gcnew Service1(), // gcnew Service2() // }; // ServicesToRun = gcnew array<ServiceBase^> { gcnew SimpleWinService() }; ServiceBase::Run(ServicesToRun); } Notice most of the preceding code is comments. By the way, I can t lay claim to this code, as it is the code generated by the C# template converted into C++/CLI.

Here s the definition for a revamped Product class that uses the INotifyPropertyChanged interface, with the code for the implementation of the PropertyChanged event: Public Class Product Implements INotifyPropertyChanged Public Event PropertyChanged As PropertyChangedEventHandler _ Implements INotifyPropertyChanged.PropertyChanged Public Sub OnPropertyChanged(ByVal e As PropertyChangedEventArgs) If Not PropertyChangedEvent Is Nothing Then RaiseEvent PropertyChanged(Me, e) End If End Sub End Class Now you simply need to fire the PropertyChanged event in all your property setters: Private _unitCost As Decimal Public Property UnitCost() As Decimal Get Return _unitCost End Get Set(ByVal value As Decimal) _unitCost = value OnPropertyChanged(New PropertyChangedEventArgs("UnitCost")) End Set End Property

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