C# 如何减慢或停止 XNA 中的按键操作

How to slow down or stop key presses in XNA

提问by tomzx

I've begun writing a game using XNA Framework and have hit some simple problem I do not know how to solve correctly.

我已经开始使用 XNA Framework 编写游戏并且遇到了一些我不知道如何正确解决的简单问题。

I'm displaying a menu using Texture2D and using the keyboard (or gamepad) I change the menu item that is selected. My problem is that the current function used to toggle between menu items is way too fast. I might click the down button and it will go down 5 or 6 menu items (due to the fact that Update() is called many time thus updating the selected item).

我正在使用 Texture2D 显示菜单并使用键盘（或游戏手柄）更改所选的菜单项。我的问题是当前用于在菜单项之间切换的功能太快了。我可能会单击向下按钮，它会向下显示 5 或 6 个菜单项（由于多次调用 Update() 从而更新所选项目）。

ex.
(> indicate selected)
> MenuItem1
MenuItem2
MenuItem3
MenuItem4
MenuItem5

I press the down key for just a second), then I have this state:

MenuItem1
MenuItem2
MenuItem3
> MenuItem4
MenuItem5

What I want is (until I press the key again)
MenuItem1
> MenuItem2
MenuItem3
MenuItem4
MenuItem5

What I am looking for is a way to either have the player click the up/down key many time in order to go from one menu item to the other, or to have some sort of minimum wait time before going to the next menu item.

我正在寻找的是一种让玩家多次单击向上/向下键以便从一个菜单项转到另一个菜单项的方法，或者在进入下一个菜单项之前有某种最短等待时间。

采纳答案by RCIX

I've built a (large) class that helps a lot with any and all XNA input related tasks, it makes what you're asking for easy.

我已经构建了一个（大）类，它对任何和所有 XNA 输入相关的任务都有很大帮助，它使您的要求变得简单。

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;

namespace YourNamespaceHere
{
    /// <summary>
    /// an enum of all available mouse buttons.
    /// </summary>
    public enum MouseButtons
    {
        LeftButton,
        MiddleButton,
        RightButton,
        ExtraButton1,
        ExtraButton2
    }

    public class InputHelper
    {
        private GamePadState _lastGamepadState;
        private GamePadState _currentGamepadState;
#if (!XBOX)
        private KeyboardState _lastKeyboardState;
        private KeyboardState _currentKeyboardState;
        private MouseState _lastMouseState;
        private MouseState _currentMouseState;
#endif
        private PlayerIndex _index = PlayerIndex.One;
        private bool refreshData = false;

        /// <summary>
        /// Fetches the latest input states.
        /// </summary>
        public void Update()
        {
            if (!refreshData)
                refreshData = true;
            if (_lastGamepadState == null && _currentGamepadState == null)
            {
                _lastGamepadState = _currentGamepadState = GamePad.GetState(_index);
            }
            else
            {
                _lastGamepadState = _currentGamepadState;
                _currentGamepadState = GamePad.GetState(_index);
            }
#if (!XBOX)
            if (_lastKeyboardState == null && _currentKeyboardState == null)
            {
                _lastKeyboardState = _currentKeyboardState = Keyboard.GetState();
            }
            else
            {
                _lastKeyboardState = _currentKeyboardState;
                _currentKeyboardState = Keyboard.GetState();
            }
            if (_lastMouseState == null && _currentMouseState == null)
            {
                _lastMouseState = _currentMouseState = Mouse.GetState();
            }
            else
            {
                _lastMouseState = _currentMouseState;
                _currentMouseState = Mouse.GetState();
            }
#endif
        }

        /// <summary>
        /// The previous state of the gamepad. 
        /// Exposed only for convenience.
        /// </summary>
        public GamePadState LastGamepadState
        {
            get { return _lastGamepadState; }
        }
        /// <summary>
        /// the current state of the gamepad.
        /// Exposed only for convenience.
        /// </summary>
        public GamePadState CurrentGamepadState
        {
            get { return _currentGamepadState; }
        }
        /// <summary>
        /// the index that is used to poll the gamepad. 
        /// </summary>
        public PlayerIndex Index
        {
            get { return _index; }
            set { 
                _index = value;
                if (refreshData)
                {
                    Update();
                    Update();
                }
            }
        }
#if (!XBOX)
        /// <summary>
        /// The previous keyboard state.
        /// Exposed only for convenience.
        /// </summary>
        public KeyboardState LastKeyboardState
        {
            get { return _lastKeyboardState; }
        }
        /// <summary>
        /// The current state of the keyboard.
        /// Exposed only for convenience.
        /// </summary>
        public KeyboardState CurrentKeyboardState
        {
            get { return _currentKeyboardState; }
        }
        /// <summary>
        /// The previous mouse state.
        /// Exposed only for convenience.
        /// </summary>
        public MouseState LastMouseState
        {
            get { return _lastMouseState; }
        }
        /// <summary>
        /// The current state of the mouse.
        /// Exposed only for convenience.
        /// </summary>
        public MouseState CurrentMouseState
        {
            get { return _currentMouseState; }
        }
#endif
        /// <summary>
        /// The current position of the left stick. 
        /// Y is automatically reversed for you.
        /// </summary>
        public Vector2 LeftStickPosition
        {
            get 
            { 
                return new Vector2(
                    _currentGamepadState.ThumbSticks.Left.X, 
                    -CurrentGamepadState.ThumbSticks.Left.Y); 
            }
        }
        /// <summary>
        /// The current position of the right stick.
        /// Y is automatically reversed for you.
        /// </summary>
        public Vector2 RightStickPosition
        {
            get 
            { 
                return new Vector2(
                    _currentGamepadState.ThumbSticks.Right.X, 
                    -_currentGamepadState.ThumbSticks.Right.Y); 
            }
        }
        /// <summary>
        /// The current velocity of the left stick.
        /// Y is automatically reversed for you.
        /// expressed as: 
        /// current stick position - last stick position.
        /// </summary>
        public Vector2 LeftStickVelocity
        {
            get 
            {
                Vector2 temp =
                    _currentGamepadState.ThumbSticks.Left - 
                    _lastGamepadState.ThumbSticks.Left;
                return new Vector2(temp.X, -temp.Y); 
            }
        }
        /// <summary>
        /// The current velocity of the right stick.
        /// Y is automatically reversed for you.
        /// expressed as: 
        /// current stick position - last stick position.
        /// </summary>
        public Vector2 RightStickVelocity
        {
            get
            {
                Vector2 temp =
                    _currentGamepadState.ThumbSticks.Right -
                    _lastGamepadState.ThumbSticks.Right;
                return new Vector2(temp.X, -temp.Y);
            }
        }
        /// <summary>
        /// the current position of the left trigger.
        /// </summary>
        public float LeftTriggerPosition
        {
            get { return _currentGamepadState.Triggers.Left; }
        }
        /// <summary>
        /// the current position of the right trigger.
        /// </summary>
        public float RightTriggerPosition
        {
            get { return _currentGamepadState.Triggers.Right; }
        }
        /// <summary>
        /// the velocity of the left trigger.
        /// expressed as: 
        /// current trigger position - last trigger position.
        /// </summary>
        public float LeftTriggerVelocity
        {
            get 
            { 
                return 
                    _currentGamepadState.Triggers.Left - 
                    _lastGamepadState.Triggers.Left; 
            }
        }
        /// <summary>
        /// the velocity of the right trigger.
        /// expressed as: 
        /// current trigger position - last trigger position.
        /// </summary>
        public float RightTriggerVelocity
        {
            get 
            { 
                return _currentGamepadState.Triggers.Right - 
                    _lastGamepadState.Triggers.Right; 
            }
        }
#if (!XBOX)
        /// <summary>
        /// the current mouse position.
        /// </summary>
        public Vector2 MousePosition
        {
            get { return new Vector2(_currentMouseState.X, _currentMouseState.Y); }
        }
        /// <summary>
        /// the current mouse velocity.
        /// Expressed as: 
        /// current mouse position - last mouse position.
        /// </summary>
        public Vector2 MouseVelocity
        {
            get
            {
                return (
                    new Vector2(_currentMouseState.X, _currentMouseState.Y) - 
                    new Vector2(_lastMouseState.X, _lastMouseState.Y)
                    );
            }
        }
        /// <summary>
        /// the current mouse scroll wheel position.
        /// See the Mouse's ScrollWheel property for details.
        /// </summary>
        public float MouseScrollWheelPosition
        {
            get 
            {
                return _currentMouseState.ScrollWheelValue;
            }
        }
        /// <summary>
        /// the mouse scroll wheel velocity.
        /// Expressed as:
        /// current scroll wheel position - 
        /// the last scroll wheel position.
        /// </summary>
        public float MouseScrollWheelVelocity
        {
            get 
            {
                return (_currentMouseState.ScrollWheelValue - _lastMouseState.ScrollWheelValue);
            }
        }
#endif
        /// <summary>
        /// Used for debug purposes.
        /// Indicates if the user wants to exit immediately.
        /// </summary>
        public bool ExitRequested
        {
#if (!XBOX)
            get
            {
                return (
                    (IsCurPress(Buttons.Start) && 
                    IsCurPress(Buttons.Back)) ||
                    IsCurPress(Keys.Escape));
            }
#else
            get { return (IsCurPress(Buttons.Start) && IsCurPress(Buttons.Back)); }
#endif
        }
        /// <summary>
        /// Checks if the requested button is a new press.
        /// </summary>
        /// <param name="button">
        /// The button to check.
        /// </param>
        /// <returns>
        /// a bool indicating whether the selected button is being 
        /// pressed in the current state but not the last state.
        /// </returns>
        public bool IsNewPress(Buttons button)
        {
            return (
                _lastGamepadState.IsButtonUp(button) && 
                _currentGamepadState.IsButtonDown(button));
        }
        /// <summary>
        /// Checks if the requested button is a current press.
        /// </summary>
        /// <param name="button">
        /// the button to check.
        /// </param>
        /// <returns>
        /// a bool indicating whether the selected button is being 
        /// pressed in the current state and in the last state.
        /// </returns>
        public bool IsCurPress(Buttons button)
        {
            return (
                _lastGamepadState.IsButtonDown(button) && 
                _currentGamepadState.IsButtonDown(button));
        }
        /// <summary>
        /// Checks if the requested button is an old press.
        /// </summary>
        /// <param name="button">
        /// the button to check.
        /// </param>
        /// <returns>
        /// a bool indicating whether the selected button is not being
        /// pressed in the current state and is being pressed in the last state.
        /// </returns>
        public bool IsOldPress(Buttons button)
        {
            return (
                _lastGamepadState.IsButtonDown(button) && 
                _currentGamepadState.IsButtonUp(button));
        }
#if (!XBOX)
        /// <summary>
        /// Checks if the requested key is a new press.
        /// </summary>
        /// <param name="key">
        /// the key to check.
        /// </param>
        /// <returns>
        /// a bool that indicates whether the selected key is being 
        /// pressed in the current state and not in the last state.
        /// </returns>
        public bool IsNewPress(Keys key)
        {
            return (
                _lastKeyboardState.IsKeyUp(key) && 
                _currentKeyboardState.IsKeyDown(key));
        }
        /// <summary>
        /// Checks if the requested key is a current press.
        /// </summary>
        /// <param name="key">
        /// the key to check.
        /// </param>
        /// <returns>
        /// a bool that indicates whether the selected key is being 
        /// pressed in the current state and in the last state.
        /// </returns>
        public bool IsCurPress(Keys key)
        {
            return (
                _lastKeyboardState.IsKeyDown(key) &&
                _currentKeyboardState.IsKeyDown(key));
        }
        /// <summary>
        /// Checks if the requested button is an old press.
        /// </summary>
        /// <param name="key">
        /// the key to check.
        /// </param>
        /// <returns>
        /// a bool indicating whether the selectde button is not being
        /// pressed in the current state and being pressed in the last state.
        /// </returns>
        public bool IsOldPress(Keys key)
        {
            return (
                _lastKeyboardState.IsKeyDown(key) && 
                _currentKeyboardState.IsKeyUp(key));
        }
        /// <summary>
        /// Checks if the requested mosue button is a new press.
        /// </summary>
        /// <param name="button">
        /// teh mouse button to check.
        /// </param>
        /// <returns>
        /// a bool indicating whether the selected mouse button is being
        /// pressed in the current state but not in the last state.
        /// </returns>
        public bool IsNewPress(MouseButtons button)
        {
            switch (button)
            {
                case MouseButtons.LeftButton:
                    return (
                        _lastMouseState.LeftButton == ButtonState.Released &&
                        _currentMouseState.LeftButton == ButtonState.Pressed);
                case MouseButtons.MiddleButton:
                    return (
                        _lastMouseState.MiddleButton == ButtonState.Released &&
                        _currentMouseState.MiddleButton == ButtonState.Pressed);
                case MouseButtons.RightButton:
                    return (
                        _lastMouseState.RightButton == ButtonState.Released &&
                        _currentMouseState.RightButton == ButtonState.Pressed);
                case MouseButtons.ExtraButton1:
                    return (
                        _lastMouseState.XButton1 == ButtonState.Released &&
                        _currentMouseState.XButton1 == ButtonState.Pressed);
                case MouseButtons.ExtraButton2:
                    return (
                        _lastMouseState.XButton2 == ButtonState.Released &&
                        _currentMouseState.XButton2 == ButtonState.Pressed);
                default:
                    return false;
            }
        }
        /// <summary>
        /// Checks if the requested mosue button is a current press.
        /// </summary>
        /// <param name="button">
        /// the mouse button to be checked.
        /// </param>
        /// <returns>
        /// a bool indicating whether the selected mouse button is being 
        /// pressed in the current state and in the last state.
        /// </returns>
        public bool IsCurPress(MouseButtons button)
        {
            switch (button)
            {
                case MouseButtons.LeftButton:
                    return (
                        _lastMouseState.LeftButton == ButtonState.Pressed &&
                        _currentMouseState.LeftButton == ButtonState.Pressed);
                case MouseButtons.MiddleButton:
                    return (
                        _lastMouseState.MiddleButton == ButtonState.Pressed &&
                        _currentMouseState.MiddleButton == ButtonState.Pressed);
                case MouseButtons.RightButton:
                    return (
                        _lastMouseState.RightButton == ButtonState.Pressed &&
                        _currentMouseState.RightButton == ButtonState.Pressed);
                case MouseButtons.ExtraButton1:
                    return (
                        _lastMouseState.XButton1 == ButtonState.Pressed &&
                        _currentMouseState.XButton1 == ButtonState.Pressed);
                case MouseButtons.ExtraButton2:
                    return (
                        _lastMouseState.XButton2 == ButtonState.Pressed &&
                        _currentMouseState.XButton2 == ButtonState.Pressed);
                default:
                    return false;
            }
        }
        /// <summary>
        /// Checks if the requested mosue button is an old press.
        /// </summary>
        /// <param name="button">
        /// the mouse button to check.
        /// </param>
        /// <returns>
        /// a bool indicating whether the selected mouse button is not being 
        /// pressed in the current state and is being pressed in the old state.
        /// </returns>
        public bool IsOldPress(MouseButtons button)
        {
            switch (button)
            {
                case MouseButtons.LeftButton:
                    return (
                        _lastMouseState.LeftButton == ButtonState.Pressed &&
                        _currentMouseState.LeftButton == ButtonState.Released);
                case MouseButtons.MiddleButton:
                    return (
                        _lastMouseState.MiddleButton == ButtonState.Pressed &&
                        _currentMouseState.MiddleButton == ButtonState.Released);
                case MouseButtons.RightButton:
                    return (
                        _lastMouseState.RightButton == ButtonState.Pressed &&
                        _currentMouseState.RightButton == ButtonState.Released);
                case MouseButtons.ExtraButton1:
                    return (
                        _lastMouseState.XButton1 == ButtonState.Pressed &&
                        _currentMouseState.XButton1 == ButtonState.Released);
                case MouseButtons.ExtraButton2:
                    return (
                        _lastMouseState.XButton2 == ButtonState.Pressed &&
                        _currentMouseState.XButton2 == ButtonState.Released);
                default:
                    return false;
            }
        }
#endif
    }
}

Just copy it into a separate class fie and move it to your namespace, then declare one (inputHelper variable), initialize it in the initialiaze portion, and call inputHelper.Update() in your update loop before the update logic. Then whenever you need something related to input, just use the InputHelper! for instance, in your situation, you would use InputHelper.IsNewPress([type of input button/key here]) to check if you want to move the menu item down or up. For this example: inputHelper.IsNewPress(Keys.Down)

只需将它复制到一个单独的类 fie 并将其移动到您的命名空间，然后声明一个（inputHelper 变量），在初始化部分初始化它，并在更新逻辑之前在更新循环中调用 inputHelper.Update() 。然后，每当您需要与输入相关的内容时，只需使用 InputHelper 即可！例如，在您的情况下，您可以使用 InputHelper.IsNewPress([此处输入按钮/键的类型]) 来检查是否要向下或向上移动菜单项。对于此示例： inputHelper.IsNewPress(Keys.Down)

回答by mnn

You could store in integer value time from last key pressed (left,right...) and if this time is bigger than some limit you could poll for new key pressed. However this could be done only for menu, because in-game you would need that information immediately.

您可以从上次按下的键（左，右...）存储整数值时间，如果这个时间大于某个限制，您可以轮询按下的新键。然而，这只能对菜单进行，因为在游戏中您会立即需要该信息。

回答by tomzx

Ok, I've figured it out. First, I added a

好的，我已经想通了。首先，我添加了一个

private Keys keyPressed = Keys.None;

and in my Update() method, I do the following:

在我的 Update() 方法中，我执行以下操作：

 KeyboardState keyboardState = Keyboard.GetState();

if (keyboardState.IsKeyUp(keyPressed))
{
    keyPressed = Keys.None;
}

if (keyboardState.IsKeyDown(keyPressed))
{
    return;
}

// Some additionnal stuff is done according to direction
if (keyboardState.IsKeyDown(Keys.Up))
{
    keyPressed = Keys.Up;
}
else if (keyboardState.IsKeyDown(Keys.Down))
{
    keyPressed = Keys.Down;
}

It seems to be working correctly.

它似乎工作正常。

回答by tomzx

What you can also do is make yourself a functions combining KyeUp and KeyDown that tells you when the key has been pressed once, only in 1 loop of the update, so that it only works everytime you press the key again.

您还可以做的是让自己成为一个结合了 KyeUp 和 KeyDown 的函数，它会告诉您何时按下了一次键，仅在更新的 1 个循环中，这样它只会在您每次再次按下该键时起作用。

回答by drxzcl

I save the GamePadState and KeyboardState from the previous update run. At the next update run i check for buttons that were not pressed last run, but are pressed now. Then I save the current state.

我保存了上次更新运行中的 GamePadState 和 KeyboardState。在下一次更新运行时，我会检查上次运行时未按下但现在按下的按钮。然后我保存当前状态。

I have all of this wrapped up in a static class that I can use to query for specific buttons and/or get a list of pressed buttons since the last update. This makes it really easy to work with multiple keys simultaneously (something you certainly want in games) and it would be trivially extensible to chords.

我将所有这些都包含在一个静态类中，我可以使用它来查询特定按钮和/或获取自上次更新以来按下的按钮列表。这使得同时使用多个键（您在游戏中肯定想要的东西）变得非常容易，并且可以轻松扩展到和弦。

回答by James Sutherland

A nice way of dealing with this kind of thing is to store a counter for each key you're interested in, which you increment every frame if the key is down, and reset to 0 if it's up.

处理这种事情的一个好方法是为您感兴趣的每个键存储一个计数器，如果键按下，则每帧递增，如果键上升，则重置为 0。

The advantage of this is that you can then test for both the absolute state of the key (if the counter is non-zero the key is down) and also easily check if it's just been pressed this frame for menus and the like (counter is 1). Plus key repeat becomes easy (counter % repeat delay is zero).

这样做的好处是，您可以测试键的绝对状态（如果计数器不为零，则键已按下），还可以轻松检查是否刚刚按下此帧以获取菜单等（计数器是1）。Plus 键重复变得容易（计数器 % 重复延迟为零）。

回答by Joel Martinez

the best way to implement this is to cache the keyboard/gamepad state from the update statement that just passed.

实现这一点的最佳方法是从刚刚通过的更新语句中缓存键盘/游戏手柄状态。

KeyboardState oldState;
...

var newState = Keyboard.GetState();

if (newState.IsKeyDown(Keys.Down) && !oldState.IsKeyDown(Keys.Down))
{
    // the player just pressed down
}
else if (newState.IsKeyDown(Keys.Down) && oldState.IsKeyDown(Keys.Down))
{
    // the player is holding the key down
}
else if (!newState.IsKeyDown(Keys.Down) && oldState.IsKeyDown(Keys.Down))
{
    // the player was holding the key down, but has just let it go
}

oldState = newState;

In your case, you probably only want to move "down" in the first case above, when the key was just pressed.

在您的情况下，您可能只想在上面的第一种情况下“向下”移动，此时按键刚刚被按下。

回答by bufferz

If your application is for a Windows machine, I've had great success using this event driven class that I found here: gamedev.net forum post

如果您的应用程序适用于 Windows 机器，那么我使用我在此处找到的这个事件驱动类取得了巨大的成功：gamedev.net forum post

It handles typical key presses and the short pauses before the repeating starts, just like normal text entry in a Windows application. Also included is mouse move/wheel events.

它处理典型的按键操作和重复开始前的短暂停顿，就像 Windows 应用程序中的普通文本输入一样。还包括鼠标移动/滚轮事件。

You can subscribe to the events, for example, using the following code:

例如，您可以使用以下代码订阅事件：

InputSystem.KeyDown += new KeyEventHandler(KeyDownFunction);
InputSystem.KeyUp += new KeyEventHandler(KeyUpFunction);

Then in the methods themselves:

然后在方法本身中：

void KeyDownFunction(object sender, KeyEventArgs e)
{
   if(e.KeyCode == Keys.F)
      facepalm();
}

void KeyUpFunction(object sender, KeyEventArgs e)
{
   if(e.KeyCode == Keys.F)
      release();
}

...and so forth. It really is a great class. I've found it's flexibility much improved over XNA's default keyboard handling. Good Luck!

……等等。这真的是一堂很棒的课。我发现它的灵活性比 XNA 的默认键盘处理有了很大改进。祝你好运！

回答by Bixel

Ranieri, what does that look like? I am having a hard time juggling these update cycles...

拉涅利，那是什么样子？我很难处理这些更新周期......

Hrmmm...

嗯...

public static bool CheckKeyPress(Keys key)
{
    return keyboardState.IsKeyUp(key) && lastKeyboardState.IsKeyDown(key);
}

SetStates() is private and it is called in the Update()

SetStates() 是私有的，它在 Update() 中调用

private static void SetStates()
{
    lastKeyboardState = keyboardState;

    keyboardState = Keyboard.GetState();
}

Here is the update...

这是更新...

public sealed override void Update(GameTime gameTime)
{
    // Called to set the states of the input devices
    SetStates();
    base.Update(gameTime);
}

I've tried adding extra checks..

我试过添加额外的检查..

if (Xin.CheckKeyPress(Keys.Enter) ||
    Xin.CheckButtonPress(Buttons.A))
{
    if (Xin.LastKeyboardState != Xin.KeyboardState ||
        Xin.LastGamePadState(PlayerIndex.One) != Xin.GamePadState(PlayerIndex.One))
    {

doesn't seem to have any noticeable effects - I can't seem to slow down the menu confirmations,

似乎没有任何明显的效果 - 我似乎无法减慢菜单确认的速度，

回答by Jake

Well what you could do is something like this (Also will track every key)

那么你可以做的是这样的事情（也会跟踪每个键）

int[] keyVals;
TimeSpan pressWait = new TimeSpan(0, 0, 1);
Dictionary<Keys, bool> keyDowns = new Dictionary<Keys, bool>();
Dictionary<Keys, DateTime> keyTimes = new Dictionary<Keys, DateTime>();

public ConstructorNameHere
{
    keyVals = Enum.GetValues(typeof(Keys)) as int[];
    foreach (int k in keyVals)
    {
        keyDowns.Add((Keys)k, false);
        keyTimes.Add((Keys)k, new DateTime()+ new TimeSpan(1,0,0));
    }
}

protected override void Update(GameTime gameTime)
{
    foreach (int i in keyVals)
    {
        Keys key = (Keys)i;
        switch (key)
        {
            case Keys.Enter:
                keyTimes[key] = (Keyboard.GetState().IsKeyUp(key)) ? ((keyDowns[key]) ? DateTime.Now + pressWait : keyTimes[key]) : keyTimes[key];
                keyDowns[key] = (keyTimes[key] > DateTime.Now) ? false : Keyboard.GetState().IsKeyDown(key);

                if (keyTimes[key] < DateTime.Now)
                {
                    // Code for what happens when Keys.Enter is pressed goes here.
                }
                break;
    }
}

By doing it this way you're able to check every key. You could also do this for just every key by create separate DateTimesand seperate boolvalues.

通过这样做，您可以检查每个键。您也可以通过创建DateTimes单独的bool值来为每个键执行此操作。