我怎么能执行我的应用程序的一个实例? [英] How can I enforce a single instance of my application?
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问题描述
如何确保我的应用程序的一个实例,并试图打开第二个实例时,焦点设置呢?
How can I ensure a single instance of my application and to set the focus to it when attempting to open a second instance?
我想:
public partial class Form1 : Form {
[DllImport("USER32.DLL", CharSet = CharSet.Unicode)]
public static extern
IntPtr FindWindow(String lpClassName, String lpWindowName);
[DllImport("USER32.DLL")]
public static extern
Boolean SetForegroundWindow(IntPtr hWnd);
private void Form1_Load(object sender, EventArgs e)
{
bool isRunning = Process.GetProcesses()
.Where(p => p.MainWindowTitle.Contains(Text))
.Count() > 1;
if (isRunning)
{
FocusWindow(Text);
Application.Exit();
}
}
public static void FocusWindow(string title)
{
SetForegroundWindow(FindWindow(null, title));
}
}
这是重点不在于应用。我该如何解决这个问题?
This is not focusing the application. How can I fix this?
推荐答案
您可能需要使用互斥
代替,避免了搜索窗口在一个稍微不可靠的方式(想象你重命名你的主要形式或打开另一种形式代替)。
You may want to use Mutex
instead, which avoids to search for windows in a slightly unreliable way (imagine you rename your main form or open another form instead).
bool createdNew;
Mutex m = new Mutex(true, "SomeNameHere", out createdNew);
if (!createdNew)
{
// Application already running. Call it and ask to show it's form.
IpcClientChannel clientChannel = new IpcClientChannel();
ChannelServices.RegisterChannel(clientChannel, true);
RemotingConfiguration.RegisterWellKnownClientType(typeof(ExchangeBase), "ipc://SomeNameHere/YourAppBase");
ExchangeBase Exchange = new ExchangeBase();
Exchange.ShowForm();
}
else
{
IpcServerChannel serverChannel = new IpcServerChannel("SomeNameHere");
ChannelServices.RegisterChannel(serverChannel, true);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(ExchangeBase), "YourAppBase", WellKnownObjectMode.SingleCall);
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
MainForm = new FormMain();
if (!MainForm.StopLoading)
{
Application.Run(MainForm);
// Keep the mutex reference alive until the termination of the program.
GC.KeepAlive(m);
}
}
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