如何將隊列更改爲List？

Question

原始代碼是：

partial class Game1 : Microsoft.Xna.Framework.Game 
{ 

    public enum GameState 
    { 
     StateMainMenu, 
     StatePlaying, 
     StateGameOver, 
     StateHelp, 
    } 


    GameState currentState = GameState.StateMainMenu; 

    KeyboardState kbState; 
    Keys[] pressedKeys; 


    Queue<FallingCharacter> Letters = new Queue<FallingCharacter>(); 

    float nextLetterTime = 0.6f; 
    int NextSpeedup = 20; // in 20 points lets speed it up 
    int iSpeed = 2; 

    int Score = 0; 

    GraphicsDeviceManager graphics; 
    SpriteBatch spriteBatch; 
    SpriteFont spriteFont; 
    public Game1() 
    { 
     graphics = new GraphicsDeviceManager(this); 
     Content.RootDirectory = "Content"; 

     graphics.PreferredBackBufferWidth = 800; 
     graphics.PreferredBackBufferHeight = 600; 
     graphics.ApplyChanges(); 
    } 


    protected override void LoadContent() 
    { 
     spriteBatch = new SpriteBatch(GraphicsDevice); 
     spriteFont = Content.Load<SpriteFont>("GameFont"); 

     base.LoadContent(); 
    } 


    public void OnKeyPressed(Keys k) 
    { 

     if ((currentState == GameState.StateMainMenu || 
      currentState == GameState.StateGameOver) 
      && k == Keys.Enter) 
     { 
      currentState = GameState.StatePlaying; 

      nextLetterTime = 0.0f; 
      NextSpeedup = 20; // in 20 points lsets speed it up 
      iSpeed = 1; 
      Score = 0; 
     } 
     else if (currentState == GameState.StatePlaying) 
     { 
      string sName = Enum.GetName(typeof(Keys), k); 
      if (Letters.Count > 0 && 
        String.Compare(Letters.Peek().character.ToString(), sName) == 0) 
      { 
       Score += 100; 
       Letters.Dequeue(); 

       NextSpeedup--; 

       if (NextSpeedup <= 0) 
       { 
        iSpeed++; 

        NextSpeedup = 20; 
       } 
      } 
     } 

     if (k == Keys.Escape) 
     { 
      this.Exit(); 
     } 
    } 


    protected override void Update(GameTime gameTime) 
    { 
     // The time since Update was called last 
     float elapsed = (float)gameTime.ElapsedGameTime.TotalSeconds; 


     kbState = Keyboard.GetState(); 

     Keys[] newKeys = (Keys[])kbState.GetPressedKeys().Clone(); 

     if (pressedKeys != null) 
     { 
      foreach (Keys k in newKeys) 
      { 
       bool bFound = false; 

       foreach (Keys k2 in pressedKeys) 
       { 
        if (k == k2) 
        { 
         bFound = true; 
         break; 
        } 
       } 

       if (!bFound) 
       { 
        OnKeyPressed(k); 
       } 
      } 
     } 

     pressedKeys = newKeys; 

     if (currentState == GameState.StatePlaying) 
     { 

      foreach (FallingCharacter fc in Letters) 
      { 
       if (fc.Pos.Y + 50 > graphics.PreferredBackBufferHeight) 
       { 
        currentState = GameState.StateGameOver; 

        Letters.Clear(); 
        break; 
       } 
       else 
       { 
        fc.Pos.Y += (elapsed * (float)(iSpeed * 40)); 
       } 
      } 


      nextLetterTime -= elapsed; 

      if (nextLetterTime <= 0 && currentState != GameState.StateGameOver) 
      { 
       nextLetterTime = 0.75f - (iSpeed * .03f); 
       Random r = new Random(); 

       Letters.Enqueue(new FallingCharacter(
        r.Next(graphics.PreferredBackBufferWidth - 30), -30, 
        Color.LightGreen, (char)((int)'A' + r.Next(25)))); 

      } 
     } 

     base.Update(gameTime); 
    } 

    protected override void Draw(GameTime gameTime) 
    { 
     GraphicsDevice.Clear(Color.CornflowerBlue); 

     spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend); 

     switch (currentState) 
     { 
      case GameState.StateMainMenu: 
       { 
        spriteBatch.DrawString(spriteFont, 
         "Press Enter to begin", 
         new Vector2(graphics.PreferredBackBufferWidth/4, 
         graphics.PreferredBackBufferHeight/2), 
         Color.White); 
       } 
       break; 
      case GameState.StatePlaying: 
       { 
        spriteBatch.DrawString(spriteFont, 
         "Score: " + Score.ToString(), 
         new Vector2(10, 10), Color.White); 

        foreach (FallingCharacter fc in Letters) 
        { 
         fc.Render(spriteBatch, spriteFont); 
        } 
       } 
       break; 
      case GameState.StateGameOver: 
       { 
        spriteBatch.DrawString(spriteFont, 
         "Score: " + Score.ToString(), 
         new Vector2(10, 10), Color.White); 
        spriteBatch.DrawString(spriteFont, 
         "Game Over", 
         new Vector2(graphics.PreferredBackBufferWidth/3, 
            graphics.PreferredBackBufferHeight/2), 
         Color.LightBlue); 
        spriteBatch.DrawString(spriteFont, 
         "Press Return to Continue", 
         new Vector2(graphics.PreferredBackBufferWidth/6, 
          graphics.PreferredBackBufferHeight/2 + 50), 
         Color.LightBlue); 
       } 
       break; 
     } 

     spriteBatch.End(); 

     base.Draw(gameTime); 
    } 

} 
} 

，我需要改變quque列出（）。

我改變之後Queue Letters = new Queue（）; List List = new List（）; 任何人都可以幫助我接下來需要改變什麼。 我對此感到非常困惑，非常感謝。

Answer 1

如果你想保持隊列（先入先出）相同的行爲，你必須做以下更改（以粗體顯示）：

---

如果（快報。計數> 0 & & String.Compare（信函。皮克（）.character.ToString（）， SNAME）== 0）

變爲

如果（Letters.Count> 0 & & String.Compare（信函。 首先（）.character.ToString（）， SNAME）== 0）

保持其中皮克返回第一個字符的行爲。

---

字母。 Dequeue（）;

變化

快報。 RemoveAt（0）;

刪除像Dequeue這樣的第一個元素。 請注意，您可以進行檢查以確保列表不爲空。

---

快報。 （字符）（（int）'A'+ r.Next（25））））;這個字符串可以是一個字符串，也可以是一個字符串，也可以是一個字符，也可以是一個字符。

變化

快報。 Add（new Falling Character（ r.Next（graphics.PreferredBackBufferWidth - 30），-30， Color。LightGreen，（char）（（int）'A'+ r.Next（25））））;

將FallingCharacter附加到列表的末尾。