C# 4 and .NET 4

application recovery ❘ 1399
and Content properties, and Load() and Save() methods. The application makes use of tracing to write
verbose messages to a trace listener so that you can retrace the events from the application.
Tracing is discussed in Chapter 19, “Instrumentation.”
using System;
using System.Diagnostics;
using System.IO;
namespace Wrox.ProCSharp.Windows7
{
public class CurrentFile
{
public bool IsDirty { get; set; }
public string Content { get; set; }
public void Load stringfileName) (
{
App.Source.TraceEvent(TraceEventType.Verbose, 0,
String.Format("begin Load {0}", fileName));
Content = File.ReadAllText(fileName);
IsDirty = false;
App.Source.TraceEvent(TraceEventType.Verbose, 0,
String.Format("end Load {0}", fileName));
}
}
}
public void Save stringfileName) (
{
App.Source.TraceEvent(TraceEventType.Verbose, 0,
String.Format("begin Save {0}", fileName));
File.WriteAllText(fileName, Content);
IsDirty = false;
App.Source.TraceEvent(TraceEventType.Verbose, 0,
String.Format("end Save {0}", fileName));
}
code snippet EditorDemo/CurrentFile.cs
If the application is restarted because of a crash, the /restart:[filename] command - line argument is
passed to the executable. To retrieve command - line information, the OnStartup() handler method is assigned
to the Startup event of the App class. With the second argument, which is of type StartupEventArgs , the
command - line arguments can be retrieved. With the /restart: argument, the following filename is assigned
to the RestartPath property. The App class also contains the TraceSource object, which is used for tracing.
using System;
using System.Diagnostics;
using System.Windows;
namespace Wrox.ProCSharp.Windows7
{
public partial class App : Application
{
public static TraceSource Source = new TraceSource("RestartDemo");
private void OnStartup(object sender, StartupEventArgs e)
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