C# Windows 窗体应用程序函数循环

Question

必须将我在控制台应用程序中创建的 RPG 游戏转换为 Windows 窗体应用程序以用于编程入门类(class)。一切都按预期进行，但后来我陷入了改造战斗系统的困境。下面是调用战斗函数的按钮点击事件和战斗函数:

private void btStoryProgression_Click(object sender, EventArgs e)
{
     {...}

     else if (flagControl == 20)
        {
             Enemy enemy = new Enemy("Hellhound", "Oblivion Cave", 1);

             if (combat(player, enemy) == true)
             {
                 Lines.Text += "You won!\n";
                 player.itemList.Add(new Item("Fruit", 22));
             }
             else
             {
                 Lines.Text = "YOU DIED.";
                 Lines.Text += "GAME OVER.";
                 return;
             }
        }
}


bool combat(Player player, Enemy enemy)
{
    Lines.Text = enemy.getName() + " appeared!\n";
    int damage;
    bool battle = true;
    int battleChoice = 0, itemChoice = -1;

    turns = 0;
    Lines.Text += "What are you going to do?";
    buttonVisibility();
    buttonChoices("Attack", "Item");

    while (battle)
    {
         if (player.getSpeed() > enemy.getSpeed())
         {
            //Player turn
            if (battleChoice == 1)
            {
                Lines.Text = player.getName() + " attacked!\n";

                if (player.getAccuracy() < 100)
                {
                    Random rnd = new Random();
                    if (rnd.Next(1, 100) > player.getAccuracy())
                    {
                        Lines.Text += "The attack missed!\n";
                        goto enemyturn;
                    }
                }


                damage = player.getAtk() - enemy.getDef();
                if (damage < 0)
                    damage = 0;
                enemy.setHP(enemy.getHP() - damage);
                if (enemy.getHP() < 0)
                    enemy.setHP(0);

                    Lines.Text += "You dealt " + damage + " damage to " + enemy.getName();
                    Lines.Text += "Enemy HP is now " + enemy.getHP();

                    if (enemy.getHP() == 0)
                        return true;
                }
                else if (battleChoice == 2)
                {
                    Lines.Text += "Your items: ";
                    foreach (Item item in player.itemList)
                    {
                        Lines.Text += item.getName();
                    }
                    Lines.Text += "Choose a number based on the order the items appeared";
                    try
                    {
                        do
                        {
                            itemChoice = Convert.ToInt32(Console.ReadLine());
                            itemChoice--;

                        } while (itemChoice > player.itemList.Count());
                    }
                    catch (FormatException)
                    {
                        Console.WriteLine("SOMETHING WRONG!!");
                    }

                    Lines.Text += "Player HP was: " + player.getHP();
                    player.setHP(player.getHP() + player.itemList[itemChoice].getRecoverQtd());
                    Lines.Text += "Player HP is now: " + player.getHP();
                    player.itemList.RemoveAt(itemChoice);

                }

                enemyturn:
                //Enemy turn
                if (battleChoice != 0)
                {
                    Lines.Text += enemy.getName() + " attacked!\n";

                    damage = enemy.getAtk() - player.getDef();
                    if (damage < 0)
                        damage = 0;
                    player.setHP(player.getHP() - damage);
                    if (player.getHP() < 0)
                        player.setHP(0);

                    Lines.Text += enemy.getName() + " dealt " + damage + " damage to " + player.getName();
                    Lines.Text += player.getName() + " HP is now " + player.getHP();
                }

                if (player.getHP() == 0)
                    return false;

                turns++;
            }
            else
            {
                enemyturn:
                //Enemy turn
                if (battleChoice != 0)
                {
                    Lines.Text += enemy.getName() + " attacked!\n";

                    damage = enemy.getAtk() - player.getDef();
                    if (damage < 0)
                        damage = 0;
                    player.setHP(player.getHP() - damage);
                    if (player.getHP() < 0)
                        player.setHP(0);

                    Lines.Text += enemy.getName() + " dealt " + damage + " damage to " + player.getName();
                    Lines.Text += player.getName() + " HP is now " + player.getHP();

                    if (player.getHP() == 0)
                        return false;
                }
                //Player turn
                if (battleChoice == 1)
                {
                    Lines.Text += player.getName() + " attacked!\n";

                    if (player.getAccuracy() < 100)
                    {
                        Random rnd = new Random();
                        if (rnd.Next(1, 100) > player.getAccuracy())
                        {
                            Lines.Text += "The attack missed!";
                            goto enemyturn;
                        }
                    }

                    damage = player.getAtk() - enemy.getDef();
                    if (damage < 0)
                        damage = 0;
                    enemy.setHP(enemy.getHP() - damage);
                    if (enemy.getHP() < 0)
                        enemy.setHP(0);

                    Lines.Text += "You dealt " + damage + " damage to " + enemy.getName();
                    Lines.Text += "Enemy HP is now " + enemy.getHP();

                    if (enemy.getHP() == 0)
                        return true;
                }

                else if (battleChoice == 2)
                {
                    Lines.Text += "Your items: ";
                    for (int i = 0; i < player.itemList.Count; ++i)
                    {
                        Lines.Text += player.itemList[i].getName();
                    }
                    Lines.Text += "Choose a number based on the order the items appeared";

                }
                turns++;
            }
            return true;

        }

基本上，当我按下按钮并调用战斗时，整个函数将被跳过，直到找到一些松散的“其他”，或者，如果我限制每个比较，程序就会卡住。我进行了一些搜索，看到有人建议使用 Delegate 或 BackgroundWorker，但我仍然对使用它们感到困惑。 This link是我发现的最接近我的问题，但它也不能帮助我(也许因为我是新手......)。

你们能帮帮我吗？提前谢谢你:)

Answer 1

您的第一个问题是您计算战斗力的方法是在 GUI 线程上运行的。由于它很忙，它实际上无法真正完成更新 GUI 的工作，因此 GUI 会卡住。永远不要在 GUI 线程上执行长时间运行的任务。

您可以使用 async 和 await 来更正此问题，方法是创建一个新的异步方法并在您的按钮点击中运行它:

private async Task RunCombat()
{
    Enemy enemy = new Enemy("Hellhound", "Oblivion Cave", 1);
    //this next line will run async now and will not block your gui thread.
    bool combatResult = await Task.Run(() => combat(player, enemy));

     if (combatResult)
     {
         Lines.Text += "You won!\n";
         player.itemList.Add(new Item("Fruit", 22));
     }
     else
     {
         Lines.Text = "YOU DIED.";
         Lines.Text += "GAME OVER.";
         return;
     }

然后只需在您的按钮点击中调用此方法，而不是您已经拥有的方法。一旦这样做，您将无法再在战斗方法中使用 Lines.Text +=，因为它将在不同的线程上运行。

我会在您的表单类声明上方创建一个名为 LineAppenderDelegate 的委托(delegate):

public delegate void LineAppenderDelegate(string lineToAdd);

然后创建一个AppendLine方法:

private void AppendLine(string lineToAdd)
{
    if(InvokeRequired) //if we are not on the gui thread
    {
        //re-call the same method on the gui thread
        LineAppenderDelegate d = new LineAppenderDelegate(AppendLine);
        Invoke(d, new object[]{lineToAdd});
    }
    else //we are on the gui thread and can just do the work
    {
        Lines.Text += lineToAdd;
    }
}

并使用它来添加行。此方法主要检查您是否在正确的线程上与 gui 交互。如果不是，它会调用 gui 线程上的方法。如果您是，它就会发挥作用。