私有类变量在表单之间不断重置

Question

我正在用 c# 创建一个简单的井字游戏，到目前为止我只有两种形式。

• frmMain.（游戏主形态）
• frmPlayerInfo.（用于选择单人或2人）

我还创建了一个 Player 类。

所以我的想法是这样的。一旦玩家输入他们的名字，它将转到 Player 类中的属性并将值存储在私有变量中，以便我可以在主窗体上获取它以用于显示目的。 但是当我回到主窗体时，属性会返回 null，这是为什么呢？

这是我的代码。

Player Class...（我已经删除了与此问题无关的无关属性和变量）

class Player
{
    #region PrivatVariables
    private string _PlayerName1;
    private string _PlayerName2;
    #endregion

    #region Properties
    public string playerName1
    {
        get
        {
            return _PlayerName1;
        }
        set
        {
            _PlayerName1 = value;
        }
    }

    public string playerName2
    {
        get
        {
            return _PlayerName2;
        }
        set
        {
            _PlayerName2 = value;
        }
    }
    #endregion


    public Player()
    {
        // Do nothing
    }

    internal void resetValues()
    {
    }
}

主窗体...（我只是包含主代码，我在窗体加载时调用新的游戏代码）

public partial class frmMain : Form
{
    Player player = new Player();

    public frmMain()
    {
        InitializeComponent();
    }

    private void frmMain_Load(object sender, EventArgs e)
    {
        // TODO : Set timer so that form can load first.

        newGame();
    }

    private void newGame()
    {
        // Creating an instance of the Form used to take in player info.
        frm_PlayerInfo playerInfo = new frm_PlayerInfo();
        // This is  going to pop up the player info form.
        DialogResult dialogResult = playerInfo.ShowDialog(); 
        LoadForm();
    }

    private void LoadForm()
    {
        grpBoxPlayer1.Text = player.playerName1;
    }

玩家信息表... ()

 public partial class frm_PlayerInfo : Form
{
    Player player = new Player();

    bool isAnimated;

    public frm_PlayerInfo()
    {
        InitializeComponent();
    }

    private void frm_PlayerInfo_Load(object sender, EventArgs e)
    {
        // Setting player tow input visibility to false because there will always be one player.
        this.txtPlayerName2.Visible = false;
        this.lblPlayerName2.Visible = false;
    }

    private void btnNext_Click(object sender, EventArgs e)
    {
        btnNext.Visible = false;

        // Used to slide the Form up or down.
        slideAnimation(ref isAnimated);
    }

    private void btnStart_Click(object sender, EventArgs e)
    {
        // Populating the Player Properties
        player.playerName1 = this.txtPlayerName1.Text;


        if (this.txtPlayerName2.Text != "")
        {
            player.playerName2 = this.txtPlayerName2.Text;
        }

        // Calling the animation method to close the animation back up and then the form will be closed.
        slideAnimation(ref isAnimated);
        FadeOutAnimation();
    }

Answer 1

在frmMain中创建一个Player类的实例，并将其传递给构造函数中的frmplayerInfo。现在你在 frmMain 中没有对 Player 类的引用。

在newGame() 方法中：

private void newGame()
{
    Player player = new Player();
    // Creating an instance of the Form used to take in player info.
    frm_PlayerInfo playerInfo = new frm_PlayerInfo(player);
    // This is  going to pop up the player info form.
    DialogResult dialogResult = playerInfo.ShowDialog(); 
    LoadForm();
}

在 frm_PlayerInfo 类中，删除此代码行 Player player = new Player();，并更改其构造函数：

public partial class frm_PlayerInfo : Form
{
Player player;

public frm_PlayerInfo(Player player)
{
    InitializeComponent();
    this.player = player;
}
// the rest of the form

另一种选择是直接在 frmPlayerInfo 中设置播放器名称属性。