How to convert a string to an int or decimal?

问题

I have this code:

Console.WriteLine("What is the price of the product?"); 
Decimal price = Decimal.Parse(Console.ReadLine());  

I take a input as a string as either a int or/and decimal number and convert it to a variable. Or well, that is my intention. The input is a price of a product and it can have decimals or it cannot. I you only type in ints, it works, but with decimals it crashes. I'm new to this and I can't seem to find an answer.

回答1:

Use TryParse to prevent exception:

while (true)
{
     string input = Console.ReadLine();
     decimal result;
     if (decimal.TryParse(input, out result))
     {
          // do your work
          break;
     }
     else
     {
          Console.WriteLine("invalid value try again");
     }
}

Also I have used while loop to force user to enter correct value.If you don't want it you can ignore the loop.

回答2:

There is many ways how achieve this. For example:

string Input = Console.ReadLine();
Decimal InputConvertedAsDecimal;
if (Decimal.TryParse(Input, out InputConvertedAsDecimal)
{
    Console.WriteLine("Inputted number is: " + InputConvertedAsDecimal.ToString(CultureInfo.InvariantCulture));
}
else
{
    Console.WriteLine("Error! Input have a incorrect format to parse.");
}

来源：https://stackoverflow.com/questions/21503239/how-to-convert-a-string-to-an-int-or-decimal