Method One: Only multiple processes are allowed to run
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[STAThread]
public static void Main ()
{
BOOL ret;
System.Threading.Mutex Mutex = new System.Threading.Mutex (True, application. ProductName, out ret);
if (ret)
{
System.Windows.Forms.Application.EnableVisualStyles (); These two lines implement XP visual style
System.Windows.Forms.Application.DoEvents ();
System.Windows.Forms.Application.Run (New Main ());
Main form for your program, if the console program does not use this sentence
Mutex. ReleaseMutex ();
}
Else
{
MessageBox.Show (NULL, "There is an application that is the same as this program is already running, please do not run multiple programs at the same time. \ n \ nthe program is about to exit. ", Application.productname, MessageBoxButtons.OK, messageboxicon.warning);
The prompt message can be deleted.
Application.exit ();//Exit Program
}
}
[STAThread]
public static void Main ()
{
BOOL ret;
System.Threading.Mutex Mutex = new System.Threading.Mutex (True, Application.productname, out ret);
if (ret)
{
System.Windows.Forms.Application.EnableVisualStyles (); These two lines implement XP visual style
System.Windows.Forms.Application.DoEvents ();
System.Windows.Forms.Application.Run (New Main ());
Main form for your program, if the console program does not use this sentence
Mutex. ReleaseMutex ();
}
Else
{
MessageBox.Show (NULL, "There is an application that is the same as this program is already running, please do not run multiple programs at the same time. \ n \ nthe program is about to exit. ", Application.productname, MessageBoxButtons.OK, messageboxicon.warning);
The prompt message can be deleted.
Application.exit ();//Exit Program
}
}
Method Two: Prevent multiple processes from running and activate the previous process when run repeatedly
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[STAThread]
public static void Main ()
{
Get the running instance.
Process instance = Runninginstance ();
if (instance = = null)
{
System.Windows.Forms.Application.EnableVisualStyles (); These two lines implement XP visual style
System.Windows.Forms.Application.DoEvents ();
There isn ' t another instance, show our form.
Application.Run (New Main ());
}
Else
{
There is another instance of this process.
Handlerunninginstance (instance);
}
}
public static Process Runninginstance ()
{
Process current = Process.getcurrentprocess ();
Process[] processes = Process.getprocessesbyname (current. ProcessName);
Loop through the running processes in with the same name
foreach (process process in processes)
{
Ignore the current process
if (process. Id! = Current. ID)
{
Make sure, the process is running from the EXE file.
if (assembly.getexecutingassembly (). Location.replace ("/", "\ \") = = Current. Mainmodule.filename)
{
Return the other process instance.
return process;
}
}
}
No Other instance is found, return null.
return null;
}
public static void Handlerunninginstance (Process instance)
{
Make sure the window was not minimized or maximized
Showwindowasync (instance. Mainwindowhandle, Ws_shownormal);
Set the real intance to foreground window
SetForegroundWindow (instance. Mainwindowhandle);
}
[DllImport ("User32.dll")]
private static extern bool Showwindowasync (IntPtr hWnd, int cmdshow);
[DllImport ("User32.dll")]
private static extern bool SetForegroundWindow (IntPtr hWnd);
Private Const int ws_shownormal = 1;
[STAThread]
public static void Main ()
{
Get the running instance.
Process instance = Runninginstance ();
if (instance = = null)
{
System.Windows.Forms.Application.EnableVisualStyles (); These two lines implement XP visual style
System.Windows.Forms.Application.DoEvents ();
There isn ' t another instance, show our form.
Application.Run (New Main ());
}
Else
{
There is another instance of this process.
Handlerunninginstance (instance);
}
}
public static Process Runninginstance ()
{
Process current = Process.getcurrentprocess ();
Process[] processes = Process.getprocessesbyname (current. ProcessName);
Loop through the running processes in with the same name
foreach (process process in processes)
{
Ignore the current process
if (process. Id! = Current. ID)
{
Make sure, the process is running from the EXE file.
if (assembly.getexecutingassembly (). Location.replace ("/", "\ \") = = Current. Mainmodule.filename)
{
Return the other process instance.
return process;
}
}
}
No Other instance is found, return null.
return null;
}
public static void Handlerunninginstance (Process instance)
{
Make sure the window was not minimized or maximized
Showwindowasync (instance. Mainwindowhandle, Ws_shownormal);
Set the real intance to foreground window
SetForegroundWindow (instance. Mainwindowhandle);
}
[DllImport ("User32.dll")]
private static extern bool Showwindowasync (IntPtr hWnd, int cmdshow);
[DllImport ("User32.dll")]
private static extern bool SetForegroundWindow (IntPtr hWnd);
Private Const int ws_shownormal = 1;
The above is the content of the two methods that C # only allows to start a winfrom process, and more about topic.alibabacloud.com (www.php.cn)!
