C# 代码在从 int 转换为 String 时返回奇怪的数字

Question

我创建了一个时间 class 来跟踪小时、分钟和 am/pm。出于某种原因，当我尝试输出标签中的文本并尝试将我的整数转换为字符串时，我得到了非常奇怪的结果。例如，当标签应显示数字 12 时，它会显示 -35791382。我相信这与 toString() 方法有关，但我不能确定。有人知道为什么会这样吗？ .toString() 和 Convert.ToString() 我都试过了。

protected void btngo_Click(object sender, EventArgs e)
{
    int hours = Convert.ToInt16(ddl2.Text);
    int minutes = Convert.ToInt16(ddl3.Text);
    bool am;
    if (ddl4.Text == "AM")
    {
        am = true;
    }
    else
    {
        am = false;
    }
    Time start = new Time(hours, minutes, am);
    Time t1 = start;
    if (ddl1.Text == "What time do you need to wake up?")
    {
        t1.hours -= 1;
        t1.minutes -= 30;
        t1.Clean();
    }
    lbl3.Text = t1.hours.ToString() + ":" + Convert.ToString(t1.minutes) + " " + Convert.ToString(t1.am);
}




public class Time
{
    public int hours;
    public int minutes;
    public bool am;

    public Time(int hours, int minutes, bool am)
    {
        this.hours = hours;
        this.minutes = minutes;
        this.am = am;
    }

    public void Clean(){
        while (this.minutes > 59)
        {
            this.hours += 1;
            this.minutes -= 60;
            if (this.hours > 12)
            {
                if (this.am == true)
                {
                    this.am = false;
                }
                else
                {
                    this.am = true;
                }
                this.hours -= 12;
            }
        }
        while (this.minutes < 0)
        {
            this.hours -= 1;
            this.minutes -= 60;
        }
        if (this.hours < 1)
        {
            if (this.am == true)
            {
                this.am = false;
            }
            else
            {
                this.am = true;
            }
            this.hours += 12;
        }

    }

Answer 1

如果进入此块，将抛出溢出异常：

    while (this.minutes < 0)
    {
        this.hours -= 1;
        this.minutes -= 60;
    }

...因为分钟数将永远减少 60。您是否在本示例中未显示的某个地方埋下了异常？我怀疑当超过 Int16 的最小允许值 (-32768) 时会引发异常。

Answer 2

它可能不能解释一切，但至少是这样的：

while (this.minutes < 0)
{
    this.hours -= 1;
    this.minutes -= 60;
}

显然是错误的。我假设你想做

    this.minutes += 60;

正在尝试纠正您其余的逻辑：

if (this.minutes > 59)
{
    while (this.minutes > 59)
    {
       this.hours += 1;
       this.minutes -= 60;
    }
}
else if (this.minutes < 0)
{
    while (this.minutes < 0)
    {
       this.hours -= 1;
       this.minutes += 60;
    }
}
if (this.hours <= 0)
{
    this.hours += 12;
    this.am = !this.am;
}
else if (this.hours > 12)
{
    this.hours -= 12;
    this.am = !this.am;
}

C# 代码在从 int 转换为 String 时返回奇怪的数字

C# code returning weird numbers when converting from int to String

c#

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visual-studio-2013

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