調用方法時如何使用局部變量？

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MethodsExceptions2
{
    class Program
    {
        static void Main(string[] args)
        {
            GetStudentInformation();
            PrintStudentDetails(firstName, lastName,birthDay);
            Console.ReadKey();
        }

        static void GetStudentInformation()
        {
            Console.WriteLine("Enter the student's first name: ");
            string firstName = Console.ReadLine();
            Console.WriteLine("Enter the student's last name");
            string lastName = Console.ReadLine();
            Console.WriteLine("Enter the student's birthday");
            string birthDay = Console.ReadLine();
        }

        static void PrintStudentDetails(string first, string last, string birthday)
        {
            Console.WriteLine("{0} {1} was born on: {2}", first, last, birthday);
        }
    }
}

如何在方法調用中輸入這些值？ 當我運行程序時，該行在可變位置空白。 我正在嘗試使用getStudentInfo方法獲取用戶輸入，然后將其存儲在變量中，並將其輸入到printStudentInfo方法中以對其進行格式設置並將其寫入控制台。

Answer 1

這段代碼根本不應該編譯和運行。 您在范圍內沒有firstName，lastName或Birthday變量。 您使用什么編輯器編寫此內容？

如果要保留變量，則在方法之外聲明它們，並以相同的方式分配它們，但不帶'string'修飾符。 像這樣...

class Program
{
    static string firstName;
    static string lastName;
    static string birthday;

    static void Main(string[] args)
    {
        GetStudentInformation();
        PrintStudentDetails(firstName, lastName, birthday);
        Console.ReadKey();
    }

    static void GetStudentInformation()
    {
        Console.WriteLine("Enter the student's first name: ");
        firstName = Console.ReadLine();
        Console.WriteLine("Enter the student's last name");
        lastName = Console.ReadLine();
        Console.WriteLine("Enter the student's birthday");
        birthday = Console.ReadLine();
    }

    static void PrintStudentDetails(string first, string last, string birthday)
    {
        Console.WriteLine("{0} {1} was born on: {2}", first, last, birthday);
    }
}

Answer 2

class Program
{
    static void Main(string[] args)
    {
        var userInputs = GetStudentInformation();
        PrintStudentDetails(userInputs);
        Console.ReadKey();
    }

    static Tuple<string, string, string> GetStudentInformation()
    {
        Console.WriteLine("Enter the student's first name: ");
        string firstName = Console.ReadLine();
        Console.WriteLine("Enter the student's last name");
        string lastName = Console.ReadLine();
        Console.WriteLine("Enter the student's birthday");
        string birthDay = Console.ReadLine();
        return new Tuple<string, string, string>(firstName, lastName, birthDay);
    }

    static void PrintStudentDetails(Tuple<string, string, string> userInputs)
    {
        Console.WriteLine("{0} {1} was born on: {2}", userInputs.Item1, userInputs.Item2, userInputs.Item3);
    }
}

Answer 3

進行此更改，您應該能夠獲得所需的內容。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace MethodsExceptions2
{
  class Program
{
    public static string firstName { get; set; }
    public static string lastName { get; set; }
    public static string birthDay { get; set; }


    static void Main(string[] args)
    {

        GetStudentInformation();
        PrintStudentDetails(firstName, lastName, birthDay);
        Console.ReadKey();
    }

    private static void PrintStudentDetails(string firstName, object lastName, object birthDay)
    {
        Console.WriteLine("{0} {1} was born on: {2}", firstName, lastName, birthDay);
    }

    private static void GetStudentInformation()
    {
        Console.WriteLine("Enter the student's first name: ");
        firstName = Console.ReadLine();
        Console.WriteLine("Enter the student's last name");
        lastName = Console.ReadLine();
        Console.WriteLine("Enter the student's birthday");
        birthDay = Console.ReadLine();

    }



}
}

靜態屬性程序class.Read下創建距離這里大約屬性創建靜態屬性來保存的價值和使用它，你在main（）method.Note呼吁任何方法C＃屬性