How to check if a WPF application is already running?

Possible Duplicate:
What is the correct way to create a single instance application?

How can I check if my application is already open? If my application is already running, I want to show it instead of opening a new instance.

---

[DllImport("user32.dll")]
private static extern Boolean ShowWindow(IntPtr hWnd, Int32 nCmdShow);

static void Main() 
{
    Process currentProcess = Process.GetCurrentProcess();
    var runningProcess = (from process in Process.GetProcesses()
                          where
                            process.Id != currentProcess.Id &&
                            process.ProcessName.Equals(
                              currentProcess.ProcessName,
                              StringComparison.Ordinal)
                          select process).FirstOrDefault();
    if (runningProcess != null)
    {
        ShowWindow(runningProcess.MainWindowHandle, SW_SHOWMAXIMIZED);
       return; 
    }
}

方法2

static void Main()
{
    string procName = Process.GetCurrentProcess().ProcessName;

    // get the list of all processes by the "procName"       
    Process[] processes=Process.GetProcessesByName(procName);

    if (processes.Length > 1)
    {
        MessageBox.Show(procName + " already running");  
        return;
    } 
    else
    {
        // Application.Run(...);
    }
}

---

public partial class App
    {
        private const string Guid = "250C5597-BA73-40DF-B2CF-DD644F044834";
        static readonly Mutex Mutex = new Mutex(true, "{" + Guid + "}");

        public App()
        {

            if (!Mutex.WaitOne(TimeSpan.Zero, true))
            {
                //already an instance running
                Application.Current.Shutdown();
            }
            else
            {
                //no instance running
            }
        }
    }

---

这里有一行代码可以为你做这个...

 if (Process.GetProcessesByName(Process.GetCurrentProcess().ProcessName).Length > 1)
{
// Show your error message
}

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