Question

我试图在C＃中的方法之间“共享”变量。我是C＃的新手，我知道没有“全局变量”这样的东西，我不太确定如何正确使用静态变量。

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

namespace ProjectOne
{
    static bool tooHigh;
    static internal waistMeasurment;
    class Main
    {
        static void Main(string[] args)
        {
            GetVariables();
        }

        public static void GetVariables() //This method gets the users height & waist measurments 
                                           //and calls the 'ValidateWaist' and 'ValidateHeight' methods for validation
        {
            Console.Write("What is your waist measurment? "); //This prints a string prompting the user to input their waist measurment
            waistMeasurment = Console.ReadLine(); //This writes the users input under the string 'waistMeasurment'
            ValidateWaist();
                if tooHigh ==true
                {
                waistMeasurment = Console.ReadLine();
                ValidateWaist();
                }
        }
        public static void ValidateWaist() //This method validates the user input so that it fits within the minimum bound
        {
            if (waistMeasurment < 60) //Checks the lower bound of the waist limit
            {
                Console.Write("Your waist measurment must be above 59cm? "); //Output error feedback
                tooHigh = true;
            }
            else
            {
                tooHigh = false;
            }
        }
    }
}

我有太高和腰部的问题

Answer 1

C＃是一种面向对象的编程语言，这意味着它由namespaces组成，其中包含classes和structs，其中包含fields和properties （所以，变量）和methods。

你是绝对正确的，C＃中没有全局变量。虽然，你可以将一个带有静态变量的类破解并将其用作全局变量，但最好将所有变量保持在本地并受到控制。

您希望实现的目标是将两个变量（tooHigh和waistMeasurment）作为静态变量置于静态Main类中。

你也不会以Python的风格使用if语句，internal是为方法而不是变量而发明的。根据您的代码，您正在寻找integer的类型，因为稍后，您正在检查变量waistMeasurment是否小于60.为了做到这一点，您首先必须投射变量为integer。正确的方法是使用int.TryParse方法。

namespace ProjectOne
{
    class Main
    {
        static bool tooHigh;
        static int waistMeasurment;

        static void Main(string[] args)
        {
            GetVariables();
        }

        public static void GetVariables() //This method gets the users height & waist measurments 
                                           //and calls the 'ValidateWaist' and 'ValidateHeight' methods for validation
        {
            Console.Write("What is your waist measurment? "); //This prints a string prompting the user to input their waist measurment
            int.TryParse(Console.ReadLine(), out waistMeasurment); //This writes the users input under the string 'waistMeasurment'
            ValidateWaist();
                if (tooHigh)
                {
                int.TryParse(Console.ReadLine(), out waistMeasurment); 
                ValidateWaist();
                }
        }
        public static void ValidateWaist() //This method validates the user input so that it fits within the minimum bound
        {
            if ((int)waistMeasurment < 60) //Checks the lower bound of the waist limit
            {
                Console.Write("Your waist measurment must be above 59cm? "); //Output error feedback
                tooHigh = true;
            }
            else
            {
                tooHigh = false;
            }
        }
    }
}

Answer 2

如评论中所述，您必须更改代码才能将变量置于Type内：

你得到了什么：

namespace ProjectOne
{
    static bool tooHigh;
    static internal waistMeasurment;

    class Main
    {
        //your code
    }
}

你要写的是什么：

namespace ProjectOne
{
    class Main
    {
        static bool tooHigh;
        static internal waistMeasurment;

        //your code again
    }
}

Answer 3

静态可用于共享变量，但需要在Class中声明，程序中有更多错误，我修改了程序，你可以使用它并调试它用于学习

using System;
using System.Collections.Generic;

namespace ConsoleApplication1
{
class Program
{
    static bool tooHigh;
    static int waistMeasurment;    
    static void Main(string[] args)
    {
        GetVariables();
    }

    public static void GetVariables() //This method gets the users height & waist measurments 
                                      //and calls the 'ValidateWaist' and 'ValidateHeight' methods for validation
    {
        Console.Write("What is your waist measurment? "); //This prints a string prompting the user to input their waist measurment
        int.TryParse(Console.ReadLine(), out waistMeasurment); //This writes the users input under the string 'waistMeasurment'
        ValidateWaist();

        if (tooHigh == true)
            {
            int.TryParse(Console.ReadLine(), out waistMeasurment); ;
            ValidateWaist();
        }
    }
    public static void ValidateWaist() //This method validates the user input so that it fits within the minimum bound
    {
        if (waistMeasurment < 60) //Checks the lower bound of the waist limit
        {
            Console.Write("Your waist measurment must be above 59cm? "); //Output error feedback
            tooHigh = true;
        }
        else
        {
            tooHigh = false;
        }
    }
}

}

使用静态变量从不同的方法调用

3 个答案: