您可以使用以下内容：

    private ManagementEventWatcher WatchForProcessStart(string processName)
    {
        string queryString =
            "SELECT TargetInstance" +
            "  FROM __InstanceCreationEvent " +
            "WITHIN  10 " +
            " WHERE TargetInstance ISA 'Win32_Process' " +
            "   AND TargetInstance.Name = '" + processName + "'";

        // The dot in the scope means use the current machine
        string scope = @"\\.\root\CIMV2";

        // Create a watcher and listen for events
        ManagementEventWatcher watcher = new ManagementEventWatcher(scope, queryString);
        watcher.EventArrived += ProcessStarted;
        watcher.Start();
        return watcher;
    }

    private ManagementEventWatcher WatchForProcessEnd(string processName)
    {
        string queryString =
            "SELECT TargetInstance" +
            "  FROM __InstanceDeletionEvent " +
            "WITHIN  10 " +
            " WHERE TargetInstance ISA 'Win32_Process' " +
            "   AND TargetInstance.Name = '" + processName + "'";

        // The dot in the scope means use the current machine
        string scope = @"\\.\root\CIMV2";

        // Create a watcher and listen for events
        ManagementEventWatcher watcher = new ManagementEventWatcher(scope, queryString);
        watcher.EventArrived += ProcessEnded;
        watcher.Start();
        return watcher;
    }

    private void ProcessEnded(object sender, EventArrivedEventArgs e)
    {
        ManagementBaseObject targetInstance = (ManagementBaseObject) e.NewEvent.Properties["TargetInstance"].Value;
        string processName = targetInstance.Properties["Name"].Value.ToString();
        Console.WriteLine(String.Format("{0} process ended", processName));
    }

    private void ProcessStarted(object sender, EventArrivedEventArgs e)
    {
        ManagementBaseObject targetInstance = (ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value;
        string processName = targetInstance.Properties["Name"].Value.ToString();
        Console.WriteLine(String.Format("{0} process started", processName));
    }

然后，您可以传入进程名称（例如“ notepad.exe”）来调用WatchForProcessStart和/或WatchForProcessEnd。

ManagementEventWatcher对象在实现IDisposable时从这两个Watch
*方法返回，因此在完成处理后，应该对这些对象调用Dispose，以防止出现问题。

如果您需要在过程开始后更快地引发事件，则还可以在查询中更改轮询值。为此，将“ WITHIN 10”行更改为小于10的值。