Checking whether the current WPF app is running or not?

Question

How to check programmatically whether my WPF app is working or not right now?, Like App.PrevInstance in VB. Please suggest me a simple method, i am beginner.

Here my code,

protected override void OnStartup(StartupEventArgs e)
{
    base.OnStartup(e);
    var runningProcessByName = Process.GetProcessesByName("TCLCGFP");
    if (runningProcessByName.Length == 0)
    {
        //Process.Start("TCLCGFP.exe");
        new TraacsClcProcess();
    }
    else
    {
        MessageBox.Show("Application is already Running.","TCLCGFP",MessageBoxButton.OK,MessageBoxImage.Information);
    }
    Environment.Exit(0);
}

It is always showing Application is already Running :P

possible duplicate of [Checking if Windows Application is running](http://stackoverflow.com/questions/4722198/checking-if-windows-application-is-running) — demonplus, Jun 03 '15 at 05:27
I am looking for simple code like App.PrevInstance which is using in VB. — Susaj S N, Jun 03 '15 at 05:31
Then update your question with exact details with what you need and what you tried already — demonplus, Jun 03 '15 at 05:49

score 3 · Answer 1 · edited May 23 '17 at 12:14

What most people do is use a named Mutex object. Use the constructor overload that tells you if it was successfully created to find out if another process has already created one with the same name. Example for using the mutex:

Mutex mutex;

try
{
   mutex = Mutex.OpenExisting("SINGLEINSTANCE");

   if (mutex!= null)
   {
         Console.WriteLine("Error, 1 instance Only");
         Application.Exit();
    }
 }
 catch (WaitHandleCannotBeOpenedException ex)
 {
        mutex  = new Mutex(true, "SINGLEINSTANCE");
 }

You can also read this How to determine if a previous instance of my application is running?

I didn't get your code man.. How can i implement your code into my App.? — Susaj S N, Jun 03 '15 at 07:47

score 0 · Answer 2 · edited Jun 16 '15 at 05:11

0

You can check process name as specified in the link I gave in the comment:

public partial class App : System.Windows.Application
{
    public bool IsProcessOpen(string name)
    {
        foreach (Process clsProcess in Process.GetProcesses()) {
            if (clsProcess.ProcessName.Contains(name))
            {
                return true;
            }
        }
        return false;
    }

protected override void OnStartup(StartupEventArgs e)
{
    // Get Reference to the current Process
    Process thisProc = Process.GetCurrentProcess();
    if (IsProcessOpen("TCLCGFP.exe") == false)
    {
        //System.Windows.MessageBox.Show("Application not open!");
        //System.Windows.Application.Current.Shutdown();
    }
    else
    {
        // Check how many total processes have the same name as the current one
        if (Process.GetProcessesByName(thisProc.ProcessName).Length > 1)
        {
            // If ther is more than one, than it is already running.
            System.Windows.MessageBox.Show("Application is already running.");
            System.Windows.Application.Current.Shutdown();
            return;
        }
        base.OnStartup(e);
    }
}

edited Jun 16 '15 at 05:11

Susaj S N

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answered Jun 03 '15 at 07:57

demonplus

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....It is always showing that the "Application is not open".when the code -> IsProcessOpen("TraacsCLCGalileoFocalPoint.exe"). And "Application is already running" when i remove ".exe" like -> IsProcessOpen("TraacsCLCGalileoFocalPoint"). – Susaj S N Jun 03 '15 at 09:47
could you please double check name of process using Process Manager? – demonplus Jun 03 '15 at 09:48
Double check mean , double processes with same name? – Susaj S N Jun 03 '15 at 09:53
No, double check - this means - look what is the process name of your exe, is it really "TraacsCLCGalileoFocalPoint.exe" – demonplus Jun 03 '15 at 09:54
Ya man. It is the Same which i have mentioned here, Should i give ".exe" here? – Susaj S N Jun 03 '15 at 10:10
Can you debug the code? Put the breakpoint into IsProcessOpen function and check what is wrong there – demonplus Jun 03 '15 at 10:13
Uff.. I am not able to Rebuild now. it is showing that being used by another process... :( – Susaj S N Jun 03 '15 at 10:25
No,,, There is no way to work this code in my app :( – Susaj S N Jun 03 '15 at 10:53

Checking whether the current WPF app is running or not?

2 Answers2