WPF Learning Path (vii) applications and Windows

Create an application Manually

1. Create an empty Project

2. Adding references

3. Add ManualApp.cs and add the following code

[STAThread]  Public Static void Main () {    new  Window ();     " Manually created application " ;    Win. Show ();     New application ();    App. Run ();}

[STAThread] Single threading model

4. A console window will appear to execute the program, and you can modify the output Type of project

Creating an application from a wizard

The main function is implemented in \obj\debug\app.g.cs

The life cycle of an application

Application starts run, enters the message loop, constantly responds to and processes events

Application Portal

The application portal is the main function, and the two main types of object Application\window, the former being unique in the global, can be obtained through application.current.

[System.STAThreadAttribute ()][system.diagnostics.debuggernonusercodeattribute ()] [ System.CodeDom.Compiler.GeneratedCodeAttribute ("presentationbuildtasks""  4.0.0.0")]publicstaticvoid  Main () {     New  Alex_wpfappdemo04.app ();    App. InitializeComponent ();    App. Run ();}

Application start

The first response event is the startup

The following method is used by default in App.xaml

<application x:class="alex_wpfappdemo04.app"             xmlns="  Http://schemas.microsoft.com/winfx/2006/xaml/presentation"             xmlns:x=" Http://schemas.microsoft.com/winfx/2006/xaml "              Startup="application_startup">

Minor changes, will be the first to enter the Application_Startup event processing method

<application x:class="alex_wpfappdemo04.app"             xmlns="  Http://schemas.microsoft.com/winfx/2006/xaml/presentation"             xmlns:x=" Http://schemas.microsoft.com/winfx/2006/xaml "              Startup="application_startup">

Status of the application

There are two states of an application, and ACTIVED/DEACTIVED,WPF can handle both states through the Actived/deactived event.

<application x:class="Alex_wpfappdemo04.app"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="Http://schemas.microsoft.com/winfx/2006/xaml"StartupUri="MainWindow.xaml"Activated="application_actived"Deactivated="application_deactived">

Exception for application

<application x:class="Alex_wpfappdemo04.app"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="Http://schemas.microsoft.com/winfx/2006/xaml"StartupUri="MainWindow.xaml"dispatcherunhandledexception="application_dispatcherunhandledexception">

When an application exception occurs, the Dispatcherunhandledexception event is triggered and the event handling logic is implemented to prevent the program from crashing

Non-normal exit

When an operating system shuts down, restarts, logs off, and so on, the application accepts the Sessionending event and can organize the shutdown, restart, logoff, and other operations of the operating system by setting the Cancel property

<application x:class="Alex_wpfappdemo04.app"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="Http://schemas.microsoft.com/winfx/2006/xaml"StartupUri="MainWindow.xaml"sessionending="application_sessionending">

Private voidApplication_sessionending (Objectsender, SessionEndingCancelEventArgs e) {    stringmsg =string. Format ("{0}. End Session?", e.reasonsessionending); Messageboxresult result= MessageBox.Show (msg,"Session Ending", Messageboxbutton.yesno); if(Result = =messageboxresult.no) {e.cancel=true; }}

Normal exit

The program exits normally when you close the main application window, all windows, and the shutdown function is called.

These 3 cases are determined by the Shutdownmode attribute

//Summary://specifies how an application would shutdown. Used by the System.Windows.Application.ShutdownMode//Property .     Public enumShutdownmode {//Summary://An application shuts if either the last window closes, or System.Windows.Application.Shutdown () //is called.Onlastwindowclose =0,        //        //Summary://An application shuts if either the main window closes, or System.Windows.Application.Shutdown () 
    //is called.Onmainwindowclose =1,        //        //Summary://An application shuts if System.Windows.Application.Shutdown ()//is called.Onexplicitshutdown =2,    }

The SHUTDOWN function has two forms, not passing any arguments, passing in int as ExitCode

To be continue ...

WPF Learning Path (vii) applications and Windows