C# 4 and .NET 4

1400 ❘ aPPendiX Guidelines fOr windOws 7 And windOws server 2008 r2
{
Source.TraceEvent(TraceEventType.Verbose, 0,
"RestartDemo begin OnStartup");
}
}
foreach (var arg in e.Args)
{
Source.TraceEvent(TraceEventType.Verbose, 0,
String.Format("argument {0}", arg));
if (arg.StartsWith("/restart:",
StringComparison.InvariantCultureIgnoreCase))
{
Source.TraceEvent(TraceEventType.Verbose, 0,
"/restart: argument found");
RestartPath = arg.Substring(9);
Source.TraceEvent(TraceEventType.Verbose, 0,
String.Format("RestartPath: {0}",
RestartPath));
}
}
}
public string RestartPath { get; private set; }
code snippet EditorDemo/App.xaml.cs
The main window (see Figure A-1) just contains
a TextBox for editing the text in the middle
area, a TextBlock control in the bottom area for
status messages, and a Menu control.
The constructor of the MainWindow class checks
to see if the application was started from a
recovery, by checking the RestartPath property
from the App class. If the application was started
because of a recovery, the filename assigned to
the RestartPath property is used to load this file
and assign it to the DataContext of the TextBox.
If the application was started normally, a new
filename for recovery is created.
Inside the constructor, a DispatcherTimer is also created that fires after 60 seconds. This is used to inform
the user that the application can only recover from a crash after running for at least 60 seconds.
The most important calls in this scenario are the helper methods RegisterForRestart() and
RegisterForRecovery(), which are called to register with the Restart Manager.
using System;
using System.Diagnostics;
using System.Threading;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Threading;
using Microsoft.WindowsAPICodePack.ApplicationServices;
namespace Wrox.ProCSharp.Windows7
{
public partial class MainWindow : Window
{
private DispatcherTimer minuteTimer;
figure a-1
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