如何檢查WPF應用程序是否已在運行？

Question

可能重複：
What is the correct way to create a single instance application?

我如何檢查我的應用程序已經打開？如果我的應用程序已經運行，我想顯示它而不是打開一個新的實例。

Answer 1

[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(...); 
    } 
} 

Answer 2

做到這一點：

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); 
    } 

Answer 3

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 
      } 
     } 
    } 

Answer 4

下面是一行代碼，它會爲你做這個...

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