WPF之创建单实例应用程序

// Startup.cs
using System;
using System.Windows;

namespace WpfApplication1
{
class Startup
{
[STAThread()]
static void Main(string[] args)
{

SimpleInstanceAppWrapper instance = new SimpleInstanceAppWrapper();
instance.Run(args);
}
}
}

// SimpleInstanceAppWrapper.cs
// 添加引用: Microsoft.VisualBasic
using System;
using System.Windows;

namespace WpfApplication1
{
class SimpleInstanceAppWrapper : Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase
{
public SimpleInstanceAppWrapper()
{
this.IsSingleInstance = true;
}

private App app;

protected override bool OnStartup(Microsoft.VisualBasic.ApplicationServices.StartupEventArgs eventArgs)
{
app = new App();
app.Run(new MainFrame()); // MainFrame类是自定义的主窗口类

return false;
}

protected override void OnStartupNextInstance(Microsoft.VisualBasic.ApplicationServices.StartupNextInstanceEventArgs eventArgs)
{
//base.OnStartupNextInstance(eventArgs);

MessageBox.Show("Cannot startup the second instance!");
}
}
}

// App.cs
using System;
using System.Windows;

namespace WpfApplication1
{
class App : Application
{
///
/// 该事件在Application.Run()方法调用之后，在主窗口显示之前发生。
///
/// 该参数包含字符串数组类型的命令行参数
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
}

///
/// 该事件在应用程序关闭时，app.Run()方法返回之前发生。
///
/// 该参数包含整数类型的退出代码
protected override void OnExit(ExitEventArgs e)
{
base.OnExit(e);
}
}
}