如何在C＃中使用Convert.ToSingle（）将字符串更改为int

Question

I am making an age calculator, and am asking for the person birth month and year. They are to enter the month as a number, eg may would be 5. After that I am doing a System.Convert.ToSingle() on the string for their birth month. But It says I need a cast. I don't know how to format a cast on this and have researched it for about an hour. Any help would be greatly appreciated:

static void Age()
    {
        Console.WriteLine("What month were you born in?");
        string ageMonth = Console.ReadLine();
        Console.WriteLine("What year were you born in?");
        string ageYear = Console.ReadLine();

        DateTime currentMonth = DateTime.Now;

        int numberMonth;
        numberMonth = Convert.ToSingle(ageMonth);
    }

Answer 1

使用int.Parse

int.Parse(ageMonth)

Answer 2

int numberMonth = int.Parse(ageMonth);

请注意，如果ageMonth不包含有效的整数，这将引发异常。

Answer 3

You should probaly use

int.TryParse(ageMonth, out numberMonth)

Handle the boolean result to make sure that they actually input an int because other options would through an exception if the user did not input an int (returns true if it was converted and then numberMonth has the int that was parsed, false if the string could not be parsed). Never trust users to input the right type of information and you should protect your code.