using System;
using System.Drawing;
using System.Windows.Forms;

public class MainForm : Form
{
    public MainForm()
    {
        this.Text = "主視窗";
        this.Size = new Size(400, 300);
        
        Button button = new Button();
        button.Text = "顯示訊息框";
        button.Click += (sender, e) => ShowCenteredMessageBox("這是一個自訂訊息框");
        Controls.Add(button);
    }

    private void ShowCenteredMessageBox(string para_ShowString)
    {
        // 創建自訂的訊息框
        Form messageBox = new Form();
        messageBox.StartPosition = FormStartPosition.Manual;

        // 設定訊息框內容
        Label messageLabel = new Label();
        messageLabel.Text = para_ShowString;
        messageLabel.AutoSize = true; // 自動調整大小
        messageLabel.Location = new Point(10, 10);
        
        // 添加關閉按鈕
        Button okButton = new Button();
        okButton.Text = "確定";
        okButton.DialogResult = DialogResult.OK;
        okButton.AutoSize = true; // 按鈕自動調整大小
        okButton.Location = new Point(10, messageLabel.Bottom + 10);
        okButton.Click += (sender, e) => messageBox.Close();

        // 將控件添加到訊息框
        messageBox.Controls.Add(messageLabel);
        messageBox.Controls.Add(okButton);

        // 計算顯示位置
        int x = this.Location.X + (this.Width / 2) - (messageBox.Width / 2);
        int y = this.Location.Y + (this.Height / 2) - (messageBox.Height / 2);
        messageBox.Location = new Point(x, y);

        // 設定訊息框大小
        messageBox.AutoSize = true;
        messageBox.AutoSizeMode = AutoSizeMode.GrowAndShrink;
        messageBox.ShowDialog();
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new MainForm());
    }
}