Question

我正在做一个大学项目，它是年鉴项目。我需要以 yyyy/yyyy 的确切格式输入年份（例如 2020/2021），谁能帮我解析和验证？

Answer 1

        bool CheckDateYear(string s)
        {
            string s1 = s.Split('/')[0];//s.Split('-')[0]
            string s2 = s.Split('/')[1];
            if (DateTime.Now.Year.ToString() != s2 || (DateTime.Now.Year - 1).ToString() != s1)
                return false;
            else
                return true;
        }

...

       if(CheckDateYear("2020/2021")
       {
          ...
       }

Answer 2

您可以使用正则表达式来验证：

using System;
using System.Text.RegularExpressions;

public class Example
{
   public static void Main()
   {
      string[] values= { "2020/2021", "2019-2020", 
                              "199e-2000" };
      Regex rgx = new Regex(@"^\d{4}(/\d{4})"); // 4 digits, forward slash, 4 digits
      foreach (string value in values)
         Console.WriteLine("{0} {1} a valid entry.", 
                           value, 
                           rgx.IsMatch(value) ? "is" : "is not");
   }
}
// The example displays the following output:
//      2020/2021 is a valid entry.
//      2019-2020 is not a valid entry.
//      199e-2000 is not a valid entry.

格式 dateTimePicker 像 yyyy-yyyy (2020/2021) c#

2 个答案: