如何避免DivideByZeroException

Question

嗨，当我试图在网格视图中运行下面的代码时，我得到了这个错误Attempted to divide by zero。

当错误发生而不被除以零时，如何通过返回零作为除法来避免此错误。

码

protected void gridpandl_RowDataBound(object sender, GridViewRowEventArgs e)
{
    try
    {
        for (int index = 0; index < this.gridpandl.Rows.Count; index++)
        {
            string Purchase = GetPurchase(this.gridpandl.Rows[index].Cells[0].Text);
            string Sales = GetSales(this.gridpandl.Rows[index].Cells[0].Text);
            string Serivce = GetService(this.gridpandl.Rows[index].Cells[0].Text);
            decimal Profit = (Convert.ToDecimal(Sales) + Convert.ToDecimal(Serivce) - Convert.ToDecimal(Purchase));
            decimal Profitprcn = (Profit * 100) / Convert.ToDecimal(Purchase);
            this.gridpandl.Rows[index].Cells[2].Text = Purchase;
            this.gridpandl.Rows[index].Cells[3].Text = Sales;
            this.gridpandl.Rows[index].Cells[4].Text = Serivce;
            this.gridpandl.Rows[index].Cells[5].Text = Profit.ToString();
            this.gridpandl.Rows[index].Cells[6].Text = Math.Round(Profitprcn, 2).ToString();
        }

    }

    catch (DivideByZeroException ex)
    {

    }
}

Answer 1

您应该使用条件运算符(?:)

将Profitprcn行更改为：

decimal Profitprcn = Convert.ToDecimal(Purchase) ==0? 0 : (Profit * 100) / Convert.ToDecimal(Purchase);

Answer 2

就像这样：

decimal purchasesVal = 0;
decimal Profit = 0;
decimal Profitprcn = 0;

string Purchase = GetPurchase(this.gridpandl.Rows[index].Cells[0].Text);
string Sales = GetSales(this.gridpandl.Rows[index].Cells[0].Text);
string Serivce = GetService(this.gridpandl.Rows[index].Cells[0].Text);

if (!string.IsNullOrEmpty(Purchases) && Convert.ToDecimal(Purchase) > 0)
{
    purchasesVal = Convert.ToDecimal(Purchase);
    Profit = (Convert.ToDecimal(Sales) + Convert.ToDecimal(Serivce) - purchasesVal);
    Profitprcn = (Profit * 100) / purchasesVal;
}