WPF实现只打开一个窗口，并且重复打开时已经打开的窗口置顶
实现代码（App.xaml.cs）
///
/// Interaction logic for App.xaml
///
public partial class App : Application
{
/// 该函数设置由不同线程产生的窗口的显示状态
///
///
///
///
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
///
/// 该函数将创建指定窗口的线程设置到前台，并且激活该窗口。键盘输入转向该窗口，并为用户改各种可视的记号。
/// 系统给创建前台窗口的线程分配的权限稍高于其他线程。
///
///
///
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
private const int SW_SHOWNOMAL = 1;
private static void HandleRunningInstance(Process instance)
{
ShowWindowAsync(instance.MainWindowHandle, SW_SHOWNOMAL);//显示
SetForegroundWindow(instance.MainWindowHandle);//当到最前端
}
private static Process RuningInstance()
{
Process currentProcess = Process.GetCurrentProcess();
Process[] Processes = Process.GetProcessesByName(currentProcess.ProcessName);
foreach (Process process in Processes)
{
if (process.Id != currentProcess.Id)
{
if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == currentProcess.MainModule.FileName)
{
return process;
}
}
}
return null;
}
private void Application_Startup(object sender, StartupEventArgs e)
{
Process process = RuningInstance();
if (process == null)
{
if (e.Args.Length == 1) //make sure an argument is passed
{
FileInfo file = new FileInfo(e.Args[0]);
if (file.Exists) //make sure it's actually a file
{
//Do whatever
MessageBox.Show(file.FullName);
}
}
}
else
{
MessageBox.Show("应用程序已经在运行中。。。");
HandleRunningInstance(process);
System.Threading.Thread.Sleep(1000);
System.Environment.Exit(1);
}
}
}