c# - 在多个函数之间使用对象

Question

我正在创建一个垃圾邮件检查器。一种方法扫描电子邮件，另一种方法向一组单词和短语添加一个已知标志以进行检查；这两种方法都是 Tester 类的一部分。目前我每个方法都有一个按钮，但是每个事件都会创建自己的垃圾邮件对象。我如何让这两个事件使用同一个对象，从而允许扫描识别我刚刚添加的标志？

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 HW8_DR
{
    public partial class Spam_Scanner : Form
    {
        public Spam_Scanner()
        {
            InitializeComponent();
        }

        private void testButton_Click(object sender, EventArgs e)
        {            
            Tester scan = new Tester();
            scan.tester(Convert.ToString(emailBox.Text));
            this.SpamRatingBox.Text = string.Format("{0:N1}%", Tester.countSpam / Tester.wordCount * 100);
            this.WordsBox.Text = Tester.posSpam;
            this.OutputPanal.Visible = true;
            this.pictureBox1.Visible = false;
        }

        private void addButton_Click(object sender, EventArgs e)
        {
            Tester scan = new Tester();
            scan.addSpam(Convert.ToString(addFlagBox.Text));
            this.addFlagBox.Text = "";
        }
    }
}

Answer 1

将 Tester 变量移动到类字段，如下所示:

public partial class Spam_Scanner : Form
{
    Tester scan;

    public Spam_Scanner()
    {
        InitializeComponent();
        scan = new Tester();
    }

    private void testButton_Click(object sender, EventArgs e)
    {            
        scan.tester(Convert.ToString(emailBox.Text));
        this.SpamRatingBox.Text = string.Format("{0:N1}%", Tester.countSpam / Tester.wordCount * 100);
        this.WordsBox.Text = Tester.posSpam;
        this.OutputPanal.Visible = true;
        this.pictureBox1.Visible = false;
    }

    private void addButton_Click(object sender, EventArgs e)
    {
        scan.addSpam(Convert.ToString(addFlagBox.Text));
        this.addFlagBox.Text = "";
    }
}