//定义结构体

internal struct LASTINPUTINFO

{

public uint cbSize;

public uint dwTime;

}

//引入系统API

[DllImport("User32.dll")]

private static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

/// <summary>

/// get the system idle time

/// </summary>

/// <returns></returns>

public long getIdleTick()

{

LASTINPUTINFO vLastInputInfo = new LASTINPUTINFO();

vLastInputInfo.cbSize = (uint)Marshal.SizeOf(vLastInputInfo);

if (!GetLastInputInfo(ref　 vLastInputInfo)) return 0;

return (Environment.TickCount - (long)vLastInputInfo.dwTime)/1000;

}

 

应用时最好单独开启一个线程来计算  不要使用UI线程

private bool autoClose = false;

private bool isRun = true;

Thread monitorSystemFree = null;

Thread monitorSystemFree = new Thread(StartAutoClose);

monitorSystemFree.IsBackground = true;

monitorSystemFree.Start();

 

/// <summary>

/// auto to close window

/// </summary>

private void StartAutoClose()

{

if (AutoClose)

{

while (this.isRun)

{

//Get System run ticks

long idleTicks = getIdleTick();

// auto close time out : 15 s (1000 is to let the result close to 15 s)

if (idleTicks >= 15)

{

this.isRun = false;

this.Dispatcher.Invoke(new Action(() =>

{

this.Close();

}), null);

}

}

}

}