Step 1 Identify a 2nd instance:
I'd recommend the MUTEX answer in this question:
How can I prevent launching my app multiple times?
Step 2 Get that first instance closed
Although the MUTEX answer identifies a second instance, it gives no way to find it and tell it to close.
Solution: Listen with a named pipe in the app (first instance the ClosEE):
//using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
public static class SomeClass
{
public static void SomeMethod()
{
Threading.Thread t = new Threading.Thread(() =>
{
try {
while (true) {
dynamic server = new NamedPipeServerStream("Closer", PipeDirection.InOut, -1);
server.WaitForConnection();
if (!server.IsConnected)
return;
dynamic reader = new IO.StreamReader(server);
dynamic casetxt = reader.ReadToEnd();
server.Close();
RootForm.Invoke(() =>
{
if (casetxt == "End") {
System.Environment.Exit(0);
}
});
}
} catch (Exception ex) {
// try/catch required in all child threads as error silently ends app.
// log it...
}
});
t.IsBackground = true;
t.Name = "EnderListener";
t.Start();
}
}
//=======================================================
//Service provided by Telerik (www.telerik.com)
Then when you detect a second instance via the Mutex, send this message from the 2nd instance the "Closer":
dynamic serverloopcount = 1;
dynamic iteration = 1;
dynamic GotServerCount = false;
do {
NamedPipeClientStream client = new NamedPipeClientStream("Closer");
client.Connect();
if (!GotServerCount) {
GotServerCount = true;
serverloopcount = client.NumberOfServerInstances;
}
dynamic reader = new IO.StreamReader(client);
dynamic writer = new IO.StreamWriter(client);
writer.WriteLine("End");
writer.Flush();
writer.Close();
client.Close();
iteration += 1;
} while (iteration <= serverloopcount);
Good luck.
