用户控制错误：尝试除以零 [英] Error in User Control : Attempted to divide by zero

问题描述

我尝试将用户控件添加到我的表单中。用户控件中的代码是：

 
我尝试将用户控件添加到我的表单中。 
 
我在User Control中的代码是：
 
 private void DashBoard_Load（object sender，EventArgs e）
 {
 CheckLabel.Text = Settings.Default。 Checked.ToString（）; 
 DelLabel.Text = Settings.Default.Deleted.ToString（）; 
 TotalLabel.Text = Settings.Default.Counter.ToString（）; 
 double Percentage = Settings.Default.Checked / Settings.Default.Counter * 100; 
 PercentageLabel.Text = Percentage.ToString（" ##。##"）+"％"; 
 if（Settings.Default.Checked> 999）
 {
 CheckLabel.Font = new Font（" Helvetica LT Std"，16，FontStyle.Bold）; 
 CheckLabel.Location = new Point（291,160）; ; 
} 
 if（Settings.Default.Counter> 999）
 {
 TotalLabel.Font = new Font（" Helvetica LT Std"，16，FontStyle.Bold）; 
 TotalLabel.Location = new Point（426,160）; 
} 
 if（Settings.Default.Deleted> 999）
 {
 DelLabel.Font = new Font（" Helvetica LT Std"，16，FontStyle.Bold）; 
 DelLabel.Location = new Point（428,160）; 
} 
 if（Percentage> = 10）
 {
 PercentageLabel.Font = new Font（" Helvetica LT Std"，22，FontStyle.Bold）; 
 PercentageLabel.Location = new Point（56,160）; 
} 
 PerChart.Series [" Per"]。Points.AddXY（百分比，百分比）; 
 int减去= 100  -  Convert.ToInt32（百分比）; 
 PerChart.Series [" Per"]。Points.AddXY（减，减）; 
 if（Settings.Default.Theme == false）
 {
 DashBoardLabel.ForeColor = SystemColors.ControlDarkDark; 
} 
} 
出现此错误。
 
 正如你所看到的，我试图获得2个int变量的百分比（例如56/87 = 0.64367816091954022988505747126437 * 100 = 64.367816091954022988505747126437，我需要将其转换为int，然后转换为字符串。
 

解决方案

您好SebGM2018，

这是因为以下代码：

 double Percentage = Settings.Default.Checked /  Settings.Default.Counter  * 100; 

我猜您已将Settings.Default.Counter的值设置为0 在您的设置文件中，该字段不能为0。

P 租赁检查。

或更改您的代码to：

 private void UserControl1_Load（object sender，EventArgs e）
 {
 CheckLabel.Text = Settings.Default.Checked.ToString（）; 
 DelLabel.Text = Settings.Default.Deleted.ToString（）; 
 TotalLabel.Text = Settings.Default.Counter.ToString（）; 
 
  double百分比= 0; 
 if（Settings.Default.Counter！= 0）
 {
 Percentage = Settings.Default.Checked / Settings.Default.Counter * 100; 
} 
  
 PercentageLabel.Text = Percentage.ToString（" ##。##"）+"％" ;; 
 // ... ... 
}   

问候，

弗兰克

I tried to add a user control to my Form. My code in User Control is:

I tried to add a user control to my Form.

My code in User Control is:

private void DashBoard_Load(object sender, EventArgs e)
{
    CheckLabel.Text = Settings.Default.Checked.ToString();
    DelLabel.Text = Settings.Default.Deleted.ToString();
    TotalLabel.Text = Settings.Default.Counter.ToString();
    double Percentage = Settings.Default.Checked / Settings.Default.Counter * 100;
    PercentageLabel.Text = Percentage.ToString("##.##") + "%";
    if (Settings.Default.Checked > 999)
    {
        CheckLabel.Font = new Font("Helvetica LT Std", 16, FontStyle.Bold);
        CheckLabel.Location = new Point(291, 160); ;
    }
    if (Settings.Default.Counter > 999)
    {
        TotalLabel.Font = new Font("Helvetica LT Std", 16, FontStyle.Bold);
        TotalLabel.Location = new Point(426, 160);
    }
    if (Settings.Default.Deleted > 999)
    {
        DelLabel.Font = new Font("Helvetica LT Std", 16, FontStyle.Bold);
        DelLabel.Location = new Point(428, 160);     
    }
    if (Percentage >= 10)
    {
        PercentageLabel.Font = new Font("Helvetica LT Std", 22, FontStyle.Bold);
        PercentageLabel.Location = new Point(56, 160);
    }
    PerChart.Series["Per"].Points.AddXY(Percentage,Percentage);
    int Minus = 100 - Convert.ToInt32(Percentage);
    PerChart.Series["Per"].Points.AddXY(Minus, Minus);
    if (Settings.Default.Theme == false)
    {
        DashBoardLabel.ForeColor = SystemColors.ControlDarkDark;
    }
}
This Error Appeared.
As you can see, I was trying to get a percentage of 2 int variables (ex. 56/87 = 0.64367816091954022988505747126437 *100 = 64.367816091954022988505747126437, I need to convert it to int, and then to string.

解决方案

Hi SebGM2018,

That is because of the following code:

    double Percentage = Settings.Default.Checked / Settings.Default.Counter * 100;

I guess you have set the Settings.Default.Counter's value to 0 in your settings file, the filed can not be 0.

Please check it.

Or change your code to:

        private void UserControl1_Load(object sender, EventArgs e)
        {
            CheckLabel.Text = Settings.Default.Checked.ToString();
            DelLabel.Text = Settings.Default.Deleted.ToString();
            TotalLabel.Text = Settings.Default.Counter.ToString();

            double Percentage = 0;
            if (Settings.Default.Counter != 0)
            {
                Percentage = Settings.Default.Checked / Settings.Default.Counter * 100;
            }

            PercentageLabel.Text = Percentage.ToString("##.##") + "%";
            //...
        }

Regards,

Frankie

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