如何在简单计算器中将Console.ReadLine()转换为两倍?C#异常问题 [英] How to convert Console.ReadLine() to double in simple calculator ? C# Problem with exception

问题描述

我使用 double.Parse 和 Convert.ToDouble 并得到相同的错误

I used double.Parse and Convert.ToDouble and got the same error

System.FormatException:输入字符串的格式不正确.

System.FormatException: Input string was not in a correct format.

当我在控制台 10.2 或其他任何双数字中书写时.

When I write in console 10.2 or any other double number.

我从一个教程中学到了知识，并且逐步进行学习，但是我不知道如何解决这个问题.

I learnt from a tutorial and I followed it step by step but I have no idea how to solve this.

我也在使用Visual Studio.

Also I am using Visual Studio.

Console.WriteLine("Enter a number: ");
double num1 = double.Parse(Console.ReadLine());

Console.Write("Enter operator: ");
string op = Console.ReadLine();

Console.WriteLine("Enter a number: ");
double num2 = double.Parse(Console.ReadLine());

if (op == "+")
{
    Console.Write(num1 + num2);
}
else if (op == "-")
{
    Console.WriteLine(num1 - num2);
}
else if (op == "/")
{
    Console.WriteLine(num1 / num2);
}
else if (op == "*")
{
    Console.WriteLine(num1 * num2);
}
else
{
    Console.WriteLine("Invalid Operator");
}

推荐答案

问题可能出在您的提示设置上.一些国家使用 .其他国家使用

The problem might be your culutral setting. Some countries uses a . others uses a ,

尝试:

double num2 = double.Parse(Console.ReadLine(), NumberStyles.Any, CultureInfo.InvariantCulture);

或将分隔符设置为:

var culture = (CultureInfo)CultureInfo.CurrentCulture.Clone();
culture.NumberFormat.NumberDecimalSeparator = ".";
double num2 = DateTime.Parse(Console.ReadLine(), culture);

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