如何检查WPF应用程序是否已在运行

本文关键字：是否 应用程序 运行 WPF 何检查 检查 | 更新日期: 2023-09-27 18:06:46

可能重复：
创建单实例应用程序的正确方法是什么？

如何检查我的应用程序是否已打开？如果我的应用程序已经在运行，我希望显示它，而不是打开一个新实例。

如何检查WPF应用程序是否已在运行

[DllImport("user32.dll")]
private static extern Boolean ShowWindow(IntPtr hWnd, Int32 nCmdShow);
static void Main() 
{
    Process currentProcess = Process.GetCurrentProcess();
    var runningProcess = (from process in Process.GetProcesses()
                          where
                            process.Id != currentProcess.Id &&
                            process.ProcessName.Equals(
                              currentProcess.ProcessName,
                              StringComparison.Ordinal)
                          select process).FirstOrDefault();
    if (runningProcess != null)
    {
        ShowWindow(runningProcess.MainWindowHandle, SW_SHOWMAXIMIZED);
       return; 
    }
}

方法2

static void Main()
{
    string procName = Process.GetCurrentProcess().ProcessName;
    // get the list of all processes by the "procName"       
    Process[] processes=Process.GetProcessesByName(procName);
    if (processes.Length > 1)
    {
        MessageBox.Show(procName + " already running");  
        return;
    } 
    else
    {
        // Application.Run(...);
    }
}

这里有一行代码可以帮你完成这项工作。。。

 if (Process.GetProcessesByName(Process.GetCurrentProcess().ProcessName).Length > 1)
{
// Show your error message
}

public partial class App
    {
        private const string Guid = "250C5597-BA73-40DF-B2CF-DD644F044834";
        static readonly Mutex Mutex = new Mutex(true, "{" + Guid + "}");
        public App()
        {
            if (!Mutex.WaitOne(TimeSpan.Zero, true))
            {
                //already an instance running
                Application.Current.Shutdown();
            }
            else
            {
                //no instance running
            }
        }
    }

这样做：

    using System.Threading;
    protected override void OnStartup(StartupEventArgs e)
    {
        bool result;
        Mutex oMutex = new Mutex(true, "Global''" + "YourAppName",
             out result);
        if (!result)
        {
            MessageBox.Show("Already running.", "Startup Warning");
            Application.Current.Shutdown();
        }
        base.OnStartup(e);
    }
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