如何确定EventHandler中的Control属于哪个类？

Question

这是我的类，其中有各种属性以及面板控件：

public class Square
{
    private Panel _pSquare;
    public Panel PSquare
    {
        get { return _pSquare; }
        set { _pSquare = value; }
    }
    ....

这是表单加载事件处理程序，其中创建了一堆方形对象：

private void Form1_Load(object sender, EventArgs e)
{
    for (var n = 0; n < gridSize; n++)
    {
        for (var m = 0; m < gridSize; m++)
        {
            Square squareboard = new Square(n, m);

            squareboard.PSquare.Click += squareEvent;
             ...

当用户单击面板时，调用 pSquare_Click 事件处理程序，以便该部分工作。

private void pSquare_Click(object sender, EventArgs e)
{

我遇到的问题是：如何在此 EventHandler 中访问类 Square 的属性？

Answer 1

每当创建面板时，请使用 panel.Tag 将每个面板与其方块链接：

private void Form1_Load(object sender, EventArgs e)
{
    for (var n = 0; n < gridSize; n++)
    {
        for (var m = 0; m < gridSize; m++)
        {
            Square squareboard = new Square(n, m);

            squaredboard.PSquare.Tag = squareboard;
            squareboard.PSquare.Click += squareEvent;
            ...

private void pSquare_Click(object sender, EventArgs e)
{
    Panel panel = (Panel)sender;
    Square square = (Square)panel.Tag;//access to the underlying square object
}

Answer 2

您的 Square 类可能如下所示：

public class Square
{
    private readonly Panel _pSquare;

    public Square(Panel pSquare)
    {
        this._pSquare = pSquare;
        this._pSquare.Click += this._pSquare_Click;
    }

    void _pSquare_Click(object sender, EventArgs e)
    {
        this.onSquareClicked();
    }

    public event EventHandler SquareClicked;

    private void onSquareClicked()
    {
        EventHandler eventHandler = this.SquareClicked;
        if (eventHandler != null)
        {
            eventHandler(this, EventArgs.Empty);
        }
    }
}

在您的表单中，您可以首先制作面板，然后通过循环面板生成正方形集合：

    foreach (Panel panel in this.Controls.OfType<Panel>())
    {
        var square = new Square(panel);
        square.SquareClicked += this.squareClicked;
    }