我正在做这个计算器使用System.Windows.Forms,每次我尝试做一个平方根,Cos,Sin或Tan操作,并按下Equals按钮它停止并告诉我'System.FormatException:输入字符串不在一个正确的格式“,我不知道为什么。为什么这个计算器给我'输入字符串格式不正确'错误?
这是我buttonEquals_Click事件:
private void buttonEquals_Click(object sender, EventArgs e)
{
double num2;
double answer;
num2 = double.Parse(textBoxResult.Text);
switch (theOperator)
{
case "+":
answer = resultValue + num2;
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
case "-":
answer = resultValue - num2;
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
case "×":
answer = resultValue * num2;
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
case "÷":
answer = resultValue/num2;
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
case "sqrt":
answer = Math.Sqrt(resultValue);
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
case "exp":
answer = Math.Pow(resultValue, num2);
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
case "sin":
answer = Math.Sin(resultValue);
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
case "cos":
answer = Math.Cos(resultValue);
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
case "tan":
answer = Math.Tan(resultValue);
textBoxResult.Text = answer.ToString();
resultValue = 0;
break;
default:
answer = 0;
break;
}
}
,这是我SqrtButton_Click事件和DivisionButton_event(所以你可以看到,DivisionButton它的工作):
private void SqrtButton_Click(object sender, EventArgs e)
{
resultValue = resultValue + double.Parse(textBoxResult.Text);
theOperator = "sqrt";
textBoxResult.Clear();
}
private void DivisionButton_Click(object sender, EventArgs e)
{
resultValue = resultValue + double.Parse(textBoxResult.Text);
theOperator = "÷";
textBoxResult.Clear();
}
我会很感激的任何帮帮我。
编辑:唯一的例外是在trown:num2 = double.Parse(textBoxResult.Text);
什么是调试器告诉你什么时候在'SqrtButtonClick'中设置断点?该值是否适合传递给'double.Parse'? 当您检查'resultValue'时,在''sqrt''的'case'中怎么办?是什么值适合传递给函数'sqrt'? –
现在你有你的答案。 *输入字符串无效* –
它没有到达下一行。它停在'num2 = double.Parse(textBoxResult.Text);'但是如果我把断点放在'case'中,它就会输入case。 –