递增/递减时间

Question

您好我在尝试制作一个简单的事件调度程序时遇到了一些问题。在下面的代码中，我的目的是增加或减少时间（当使用鼠标事件按下按钮时）。

但是试了很多次都搞不明白为什么能增加；但不是减少时间。

    // Timer
    private Timer TmrCount;

    private int HH {get;set;}
    private int MM { get; set; }

    private Button CurrBtn = new Button();

    #region <Mouse Events>
    private void OnMouseDown(object sender, EventArgs e)
    {
        CurrBtn = (Button)sender;

        StartTimer();
    }

    private void OnMouseUp(object sender, MouseEventArgs e)
    {
        StopTimer();
    }
    #endregion

    #region <Timer>
    private void StartTimer()
    {
        if (TmrCount == null)
        {
            TmrCount = new Timer();
            TmrCount.Interval = 210;
            TmrCount.Tick += TmrCount_Tick;
            TmrCount.Start();
        }
    }

    private void TmrCount_Tick(object sender, EventArgs e)
    {
        Set_Time();
    }

    private void StopTimer()
    {
        if (TmrCount != null)
        {
            TmrCount.Stop();
            TmrCount.Dispose();
            TmrCount.Tick -= TmrCount_Tick;
            TmrCount = null;
        }
    }

    private void Set_Time()
    {
        switch (CurrBtn.Text)
        {
            case "+":
                // Condition Check (Increase HH))
                //if (HH == 23) { HH = default(int); }

                //Increase HH
                //if (HH < 23) { HH += 1; }

                while (HH < 23) { HH++; break; }
                break;

            case "-":
                // Condition Check (Decrease HH)
                //if (HH == default(int)) { HH = 23; }
                //if (HH == 0) { HH = 23; }

                // Decrease HH
                while (HH > 23) { HH-=1; break; }
                break;
        }

        // Set Hour Text into Label
        lbl_HH.Text = Convert.ToString(HH);
    }
    #endregion

谁能给我指出正确的方向？提前致谢

Answer 1

假设您的 HH 变量以值 1 开头，那么您应该以这种方式更改您的 SetTime

int HH = 1;

private void Set_Time()
{
    switch (CurrBtn.Text)
    {
        case "+":
            // Condition Check (Increase HH))
            // Within a limit of 23
            while (HH < 23) { HH++; break; }
            break;

        case "-":
            // Condition Check (Decrease HH)
            // Decrease HH but don't allow it to be less than 0 
            while (HH >= 0) { HH-=1; break; }
            break;
    }

    // Set Hour Text into Label
    lbl_HH.Text = Convert.ToString(HH);
}

顺便说一句，在处置一个对象后，您永远不应该尝试访问它，即使是删除事件处理程序也是如此。

private void StopTimer()
{
    if (TmrCount != null)
    {
        TmrCount.Stop();
        TmrCount.Tick -= TmrCount_Tick;
        TmrCount.Dispose();
        TmrCount = null;
    }
}

递增/递减时间

Increment / Decrement Time

c#

datetime

timer

increment

decrement