Gmail 控制台应用程序 C#

Question

我想弄清楚为什么我的菜单方法中出现错误 "Cannot assign to 'loggedIn' because it is a method group"。任何帮助将不胜感激。代码如下：

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

    namespace GmailClient
{
  class Program
{
    static string userName="";
    static string passWord="";

    public static bool loggedIn()
    {
        if (userName == "")
        {
            if (passWord == "")
            {
                return false;
            }
            else
            {
                return false;
            }
        }
        else
        {
            return true;
        }
    }

    static void Main(string[] args)
    {

    }
    public static void menu()
    {
        Console.WriteLine("Loading menu.");
        if ( loggedIn = false)
        {
            Console.WriteLine("__________Menu__________");
            Console.WriteLine("1) Enter your Gmail credentials");
            Console.WriteLine("2) Exit the Console");
            Console.WriteLine("________________________");
            Console.WriteLine("What do you want to do?");

            int userchoice = Convert.ToInt32(Console.ReadLine());
            if (userchoice == 1)
            {
                credentials();
            }
            else if (userchoice == 2)
            {
                Console.WriteLine("Hope to see you soon!");
                Console.ReadKey();
                Environment.Exit(0);
            }
        }
        else if (loggedIn = true)
        {
            Console.WriteLine("__________Menu__________");
            Console.WriteLine("1) Enter your Gmail credentials");
            Console.WriteLine("2) Check your inbox");
            Console.WriteLine("3) Send an e-mail");
            Console.WriteLine("4) Exit the Console");
            Console.WriteLine("________________________");
            Console.WriteLine("What do you want to do?");

            int userchoice = Convert.ToInt32(Console.ReadLine());
            if (userchoice == 1)
            {
                credentials();
            }
            else if (userchoice ==2)
            {
                getMail();
            }
            else if (userchoice ==3)
            {
                sendMail();
            }
            else if (userchoice ==4)
            {
                Console.WriteLine("Hope to see you soon!");
                Console.ReadKey();
                Environment.Exit(0);
            }
        }
    }
    public static void credentials()
    {
        Console.WriteLine("Enter your Gmail address:");
        userName = Console.ReadLine();
        Console.WriteLine("Enter your Gmail password:");
        passWord = Console.ReadLine();
    }
    public static void getMail()
    {
        Console.WriteLine("Loading inbox messages");
    }
    public static void sendMail()
    {
        Console.WriteLine("Under Construction");
    }
}

}

Answer 1

将 if ( loggedIn = false) 更改为 if (!loggedIn())，将 if (loggedIn = true) 更改为 if (loggedIn())。

此外，在使用 if 条件检查时，不要使用单个等于 =。 = 是赋值（例如，您正在为变量 variable = "value" 赋值）。比较时使用双等号 ==（例如 if (variable == true) ...）。

对于您的代码，loggedIn 被定义为 method/function。您的代码将其视为 property/variable.

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