C# 判断某程序是否运行，已运行则激活

[DllImport("user32.dll")]

private static extern bool

SetForegroundWindow(IntPtr hWnd);

[DllImport("user32.dll")]

private static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);

[DllImport("user32.dll")]

private static extern bool IsIconic(IntPtr hWnd);

// 消息函数

[DllImport("user32.dll", EntryPoint = "PostMessageA")]

public static extern bool PostMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

[DllImport("user32.dll")]

public static extern IntPtr FindWindow(string strclassName, string strWindowName);

[DllImportAttribute("user32.dll")]

public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

public const int WM_SYSCOMMAND = 0x0112;

public const int SC_MAXIMIZE = 0xF030;

private string exeName = "SaoMiaoApp";

public void SetForm()

{

Process[] processes = Process.GetProcessesByName(exeName);

if (processes.Length > 0)

{

IntPtr hWnd = processes[0].MainWindowHandle;

if (IsIconic(hWnd))

ShowWindowAsync(hWnd, 9);// 9就是SW_RESTORE标志，表示还原窗体

//SendMessage(hWnd, WM_SYSCOMMAND, SC_MAXIMIZE, 0);

SetForegroundWindow(hWnd);

}

else

{

Process.Start(exeName + ".exe");

}

}