最近在做一个快递柜项目，要求在用户没有操作的时间到了一分钟，，自动返回主页，我于是封装了一个倒计时控件，废话少说，直接上代码

public partial class RemainingTimeUC : UserControl { public RemainingTimeUC() { InitializeComponent(); } Form ParantForm = null; private void RemainingTimeUC_Load(object sender, EventArgs e) { //获得用户控件所在的长提 ParantForm = this.FindForm(); } #region timerUC_Tick事件 private void timerUC_Tick(object sender, EventArgs e) { try { int TotalSecond = 60;//设置时间为60s var remainTime = TotalSecond - MouseKeyBoardOperate.GetLastInputTime();//总时间-用户未操作的时间 this.labRT.Text = remainTime.ToString(CultureInfo.InvariantCulture);//显示离关闭的剩余时间 if (remainTime == 30) { this.labRT.ForeColor = Color.Orange; } if (remainTime <= 9) { this.labRT.ForeColor = Color.Red; this.labRT.Text = "0" + remainTime; } if (remainTime == 59) this.labRT.ForeColor = Color.White; if (remainTime == 0) { ParantForm.Close(); } } catch (Exception ex) { LogHelper.WriteLog(this.Name + "timerUC_Tick", ex.Message); } } #endregion }

//
//此方法不知道是哪位前辈写的，借用一下
//

public class MouseKeyBoardOperate
{
/// <summary>
/// 创建结构体用于返回捕获时间
/// </summary>
[StructLayout(LayoutKind.Sequential)]
struct Lastinputinfo
{
/// <summary>
/// 设置结构体块容量
/// </summary>
[MarshalAs(UnmanagedType.U4)]
public int cbSize;

/// <summary>
/// 抓获的时间
/// </summary>
[MarshalAs(UnmanagedType.U4)]
public uint dwTime;
}

[DllImport("user32.dll")]
private static extern bool GetLastInputInfo(ref Lastinputinfo plii);

/// <summary>
/// 获取键盘和鼠标没有操作的时间
/// </summary>
/// <returns>用户上次使用系统到现在的时间间隔，单位为秒</returns>
public static long GetLastInputTime()
{
var vLastInputInfo = new Lastinputinfo();
vLastInputInfo.cbSize = Marshal.SizeOf(vLastInputInfo);
if (!GetLastInputInfo(ref vLastInputInfo))
{
return 0;
}
else
{
var count = Environment.TickCount - (long)vLastInputInfo.dwTime;
var icount = count / 1000;
return icount;
}
}

winfrom 倒计时控件