Question

我是一名新手程序员（有5天的经验），我正在制作一个简单的tic tac toe代码以了解有关C＃的更多信息。

我的问题是从方法Turn返回新值后，变量PlayerTurn的值不变。

我猜问题出在静态与非静态之间，这让我感到困惑

MainClass

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

namespace MehdiTicTacToe
{
    class Program
    {

        static void Main(string[] args)
        {
            GameMainBody GMB = new GameMainBody();
            int Turn = 0; // 1 if player turn else 0
            string[] TheBoard = new string[9];
            GMB.PlayerTurn(Turn);
            Console.WriteLine(Turn);
            GMB.Board(TheBoard);
            Console.ReadLine();
        }

    }
}

1级

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

namespace gamemainbody
{
    class GameMainBody
    {
        private string[] theBoard;
        private int turn;
        public int Turn {
            get => turn;
            set => turn = value; }
        public string[] TheBoard {
            get => theBoard;
            set => theBoard = value; }

        public void Board(string[] TheBoard)
        {
            this.TheBoard = TheBoard;

            Console.WriteLine("     |     |      ");

            Console.WriteLine("  {0}    |  {1}  |  {2}", TheBoard[0], TheBoard[1], TheBoard[2]);

            Console.WriteLine("_____|_____|_____ ");

            Console.WriteLine("     |     |      ");

            Console.WriteLine("  {0}  |  {1}  |  {2}", TheBoard[3], TheBoard[4], TheBoard[5]);

            Console.WriteLine("_____|_____|_____ ");

            Console.WriteLine("     |     |      ");

            Console.WriteLine("  {0}  |  {1}  |  {2}", TheBoard[6], TheBoard[7], TheBoard[8]);

            Console.WriteLine("     |     |      ");
        }
        public int PlayerTurn(int Turn)
        {
            this.Turn = Turn;
            Console.WriteLine("Type X if you chose X");
            Console.WriteLine("Type O if you chose O");
            string UserInput = Console.ReadLine();
            if (UserInput == "X" || UserInput == "x")
            {
                Console.WriteLine("PlayerTurn");
                Turn += 1;
                return Turn;
            }
            if (UserInput == "O" || UserInput == "o")
            {
                Turn = 0;
                Console.WriteLine("AI Turn");
                return Turn;
            }
            else
            {
                Turn -= 1;
                return Turn;
            }
        }
        public void GameCore(int Turn, string[] Board)
        {

        }
    }
}

运行这段代码后，我打印了变量Turn的值，它的值仍然是0。

感谢您的帮助！

Answer 1

import sys from PyQt5 import QtCore, QtWidgets def expandPath(index, view): if not index.isValid(): return indexes = [] ix = index while ix.isValid(): indexes.insert(0, ix) ix = ix.parent() for ix in indexes: view.expand(ix) if __name__ == "__main__": app = QtWidgets.QApplication(sys.argv) model = QtWidgets.QFileSystemModel() model.setRootPath(QtCore.QDir.rootPath()) view = QtWidgets.QTreeView() view.setModel(model) view.setRootIndex(model.index(QtCore.QDir.rootPath())) doc_directory = QtCore.QStandardPaths.writableLocation( QtCore.QStandardPaths.DocumentsLocation ) ix = model.index(doc_directory) expandPath(ix, view) view.resize(640, 480) for i in (1, 2, 3): view.setColumnHidden(i, True) view.show() sys.exit(app.exec_())是Value Type，因此您需要在Main方法中使用它来接收更改：

Turn

Answer 2

您还可以明确指定Turn作为ref传递：

using System;

public class Program
{
    static void ModifyInt(ref int x)  # ref keyword here
    {
        x = x * 2;
    }

    public static void Main()
    {
        int value = 22;
        ModifyInt(ref value);         # ref keyword here

        Console.WriteLine( value );
    }
}

这样，您的ValueType被引用显式传递和更改：ref (C# Reference)

输出：

尽管我会首选使用返回值：）

从方法返回变量后，变量值不变

2 个答案: