Question

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

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

        static void Main(string[] args)
        {
            GetStudentInformation();
            //PrintStudentDetails(firstName, lastName,birthDay);
            Console.WriteLine("{0} {1} {2}", 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();

            //Console.WriteLine("{0} {1} {2}", firstName, lastName, birthDay);

        }

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

我尝试了各种方法，向我推荐了如何声明类变量，但我得到的每个解决方案似乎都不起作用。我试图将用户的输入保存为3个变量; lastName，firstName和birthday。无论何时运行程序，它都会询问值，当它尝试打印变量时，它只显示一个空行。

如何以这种方式输出变量？

Answer 1

在本节中：

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();

您正在使用这些名称创建新变量，仅用于方法的范围，而不是分配给类的那些。移除前面的string：

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();

我建议更多地阅读Variable and Method Scope。另外我认为你应该更多地考虑使用静态类并阅读：When to use static classes in C#

史蒂夫在他的回答中建议，最好创建一个类Student，然后填充它。但是，虽然适合这段代码，但我不会将其声明为static，而是从请求用户输入的函数返回。

如何使用类变量进行方法调用

1 个答案: