C＃標簽字符串到int轉換錯誤

Question

我正在用C＃制作一個非常小的RPG游戲，以練習一些技能（並玩得開心！）。 我對圖像，按鈕等已經走得很遠了。 我的問題是，在嘗試將標簽字符串轉換為要與我的attackingPhase()方法進行比較的整數時，我被拋出錯誤。

這是我的代碼和錯誤的屏幕截圖。

我相信我的代碼是正確的，但我無法弄清楚為什么會引發該錯誤。

感謝您的所有幫助。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RPG
{
public partial class Form2 : Form
{
    private Form1 mainForm = null;

    public Form2(Form callingForm)
    {
        mainForm = callingForm as Form1;
        InitializeComponent();

        pictureBox1.Image = mainForm.MyPictureBoxEnemy.Image;
        pictureBox2.Image = mainForm.MyPictureBoxHero.Image;
        lbl_Health_Value_Enemy.Text = "100";
        lbl_Health_Value_Hero.Text = "100";

    }

    public void attackingPhase()
    {
        Random rnd = new Random();

        int enemy_damage = rnd.Next(1, 25);
        int hero_damage = rnd.Next(2, 15);

        var enemyHealth = Convert.ToInt32(lbl_Health_Value_Enemy);
        var heroHealth = Convert.ToInt32(lbl_Health_Value_Hero);

        if((enemyHealth & heroHealth) > 0)
        {
            enemyHealth = enemyHealth - enemy_damage;
            heroHealth = heroHealth - hero_damage;
        } else
        {
            MessageBox.Show("DEAD");
        }

        lbl_Health_Value_Enemy.Text = enemyHealth.ToString();
        lbl_Health_Value_Hero.Text = heroHealth.ToString();
    }

    private void btnAttack_Click(object sender, EventArgs e)
    {
        attackingPhase();
    }
}
}

---

Answer 1

您需要轉換標簽的Text屬性，

var enemyHealth = Convert.ToInt32(lbl_Health_value_Enemy.Text);
var heroHealth = Convert.ToInt32(lbl_Health_Value_Hero.Text);