This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
What is the correct way to create a single instance application?
How can I define my application to open only one time after click on its exe file over and over?
There are several related questions on Stack Overflow for Single Instance Applications:
This one seems to be the most apropriate: What is the correct way to create a single-instance application?
I've always done this at the application's entry point:
bool onlyInstance = false;
Mutex m = new Mutex(true, "MyUniqueMutextName", out onlyInstance);
if (!onlyInstance)
{
return;
}
GC.KeepAlive(m);
Related
This question already has answers here:
Check if a specific exe file is running
(8 answers)
Closed 5 years ago.
Is there a way to check (using C#) whether there is an instance of an EXE that is refered to by path running? If so, please provide the method of doing so. Thank you in advance.
Example: Is there a way to find out if "C:\foo\bar.exe" has a running instance, by refering to the EXE as "C:\foo\bar.exe"?
Do you want something like that;
public List<Process> GetProcessesByFileName(string fileName)
{
return Process.GetProcesses().Where(x => x.MainModule.FileName == fileName).ToList();
}
This question already has answers here:
What is the correct way to create a single-instance WPF application?
(39 answers)
Closed 6 years ago.
I've been struggling with this for more than several hours and cannot think of a solution.
I have an application that can be started in this way:
TestApplication.exe ID={GUID} filename={filename}
If there is not an instance of the application with the same GUID, a new instance should be started with ID={GUID} and the specified file should be loaded in it.
If there is an instance of the application with the same GUID, the user should be asked if he wants to close the file he is working on and if he confirms it - then the new file specified should be opened in the running instance.
Any ideas how to implement this?
Use a Mutex. See the first answer of this question:
What is the correct way to create a single-instance application?
Any ideas how to implement this?
Yes. Question answered. You never ask us to show us our ideas.
Let's get real.
One way is by window title, but having the GUID there is seriously not optimal.
As such, read up on NAMED MUTEXES. You can use that one to identify a program already running.
Alternatively - and better given you must actually send a signal - named pipes. You can register a named pipe with the GUID. Fails: Already exists. THAT allows the new application to actually signal the old one and or send a shutdown command.
This question already has answers here:
Run single instance of an application using Mutex
(7 answers)
Closed 8 years ago.
Can someone tell me How to ensure that the console app doesn't open a new window if one is already open when I run the exe file multiple times ?
You could try creating a named mutex and if there is already a mutex with that name, exit.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Prevent multiple instances of a given app in .NET?
How can I enforce a single instance of my application?
I have a source then complie to App.exe file. I want if App.exe is running, then a person open it again, it know that it is running and close automaticly. Is there any way to do this?
**Edit: I want a code that insert to source of App.exe
Window Form**
You want to use a Mutex, like so:
bool bIsSingleInstance;
using (new Mutex(true, Assembly.GetExecutingAssembly().GetName().Name, out bIsSingleInstance)) {
if (bIsSingleInstance) {
// START APP HERE.
}
}
Note that you must NOT use 'using' if your winforms isn't blocking in the comment block.
This question already has answers here:
Closed 12 years ago.
Possible Duplicates:
What is the correct way to create a single instance application?
What is a good pattern for using a Global Mutex in C#?
Suppose i have created an exe i want that exe must run only once ..how it is possible please give suggestion
If I understand your problem correctly this has nothing to do with having a singleton implementation. You simply need to check if your executable is currently running.
You can do this by calling Process.GetProcesses() or Process.GetProcessesByName(NameOfExecutable) and checking the return values.
Alternatively use a Mutex as suggested above by others.