在格式化日期时未获得预期的输出

Question

I want my program to validate that the date format is mm/dd/yyyy . I don't want to use any throw/catch blocks.

class FunWithScheduling
{
    public void AddView()
    {
        ...
        ...

        Console.WriteLine("Enter the Date Scheduled For the Meeting:");
        string Date = Console.ReadLine();
        DateTime date = DateTime.Parse(Date);
        string formatted = date.ToString("MM-dd-yyyy");
        if (Date != formatted)
            Console.WriteLine("Invalid Choice");

        ...
        ...
    }

    static void Main()
    {
        FunWithScheduling a = new FunWithScheduling();
        a.AddView();
    }
}

Answer 1

Try:

DateTime dt;
if (
    DateTime.TryParseExact(
        "08/03/2013", 
        "MM/dd/yyyy", 
        null, 
        System.Globalization.DateTimeStyles.None, 
        out dt
    )
)
{
    //Date in correct format
}

Answer 2

签出DateTime.TryParseExact

Answer 3

you need to change this line

 DateTime date = DateTime.Parse(Date);

To

DateTime date;
if(!DateTime.TryParseExact(Date,"MM-dd-yyyy",new CultureInfo("en-US"), 
                          DateTimeStyles.None, 
                          out date))
 {
    Console.WriteLine("Invalid Choice");
 }