c# - 我的项目没有从 listbox1 移动到 listbox2

Question

这是我的 GUI 的样子

我正在为大学做一个项目

它的作用是读取文本文件

放入listbox1

那么第二个按钮应该把成功的同学带到listbox2

但是每当我按下按钮时我都会得到一个错误

我很努力的到处找，也没找到问题所在

就是无缘无故不写在listbox2里

有人知道我该怎么办吗？

我该怎么做才能让它发挥作用？？？

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;
using System.IO;

namespace second_Project
{

    public partial class FSS : Form
    {
        private void FSS_Load(object sender, EventArgs e)
        {
        }

        public FSS()
        {
            InitializeComponent();
        }



        public class StdScore   
        {

            public int id;
            public string name;
            public double xam, Score, Pract;
            public string content;

            public string[] xx;


        }


        OpenFileDialog ofd = new OpenFileDialog();


        private void button1_Click(object sender, EventArgs e)
        {
            StdScore StdScore = new StdScore();      

            ofd.Filter = "TXT|*.txt";

            if (ofd.ShowDialog() == DialogResult.OK)
            {

                StreamReader sr = new StreamReader(ofd.FileName);


                while (!sr.EndOfStream)
                {

                    StdScore.content = sr.ReadLine();

                    string[] info = StdScore.content.Split(' ');

                    StdScore.xx = new string[info.Length];

                    listBox1.Items.Add(StdScore.content);
                  
                }
                sr.Close();
            }
        }



        private void button2_Click(object sender, EventArgs e)
        {
            StdScore StdScore = new StdScore();      


            StdScore.xam = 0;
            StdScore.Pract = 0;
            StdScore.Score = 0;

            StdScore.xam += int.Parse(StdScore.xx[2]);   

            StdScore.Pract += int.Parse(StdScore.xx[3]);  

            StdScore.Score = StdScore.xam * 0.7 + StdScore.Pract * 0.3; 



            if (StdScore.xam >= 40 && StdScore.Pract >= 40 && StdScore.Score >= 60)  
            {

                StdScore.xam = (StdScore.xam * 70) / 100;
                StdScore.Pract = (StdScore.Pract * 30) / 100;
                StdScore.Score = StdScore.xam + StdScore.Pract;

                listBox2.Items.Add(StdScore.xx[0] + " " + StdScore.xx[1] + " " + StdScore.xx[2] + " " + StdScore.xx[3] + " " + StdScore.Score + " " + "Succes");


            }

        }


    }
}

Answer 1

读取文件时，您有listBox1.Items.Add(StdScore.content);。这只是将一个字符串添加到 ListBox。您应该在 while 循环内创建 StdScore 的实例，并将这些实例直接添加到列表框。将您的变量命名为与 class 本身完全相同的名称是一种非常糟糕的做法。我希望看到更像 StdScore curScore = new StdScore(); 的东西。现在您可以使用 curScore 并且很明显这是 class 的实例而不是 class 本身，并且您不会尝试访问静态成员。对于 class StdScore，您可以重写 ToString() 方法来控制在 ListBox 中显示的内容。

所以这里是 StdScore 和 ToString() 覆盖：

public class StdScore
{

    public int id;
    public string name;
    public double xam, Score, Pract;
    public string content;

    public string[] xx;

    public override string ToString()
    {
        return content;
    }

}

接下来，读取文件：

while (!sr.EndOfStream)
{
    StdScore curScore = new StdScore();
    curScore.content = sr.ReadLine();
    curScore.xx = curScore.content.Split(' ');
    listBox1.Items.Add(curScore);
}

转到 button2，您想将成功的学生转移到 listBox2。在这里，您需要迭代 listBox1:

内所有已存储的 StdScore 个实例

private void button2_Click(object sender, EventArgs e)
{
    foreach(StdScore curScore in listBox1.Items)
    {
        curScore.xam = int.Parse(curScore.xx[2]);
        curScore.Pract = int.Parse(curScore.xx[3]);
        curScore.Score = curScore.xam * 0.7 + curScore.Pract * 0.3;

        if (curScore.xam >= 40 && curScore.Pract >= 40 && curScore.Score >= 60)
        {
            curScore.xam = (curScore.xam * 70) / 100;
            curScore.Pract = (curScore.Pract * 30) / 100;
            curScore.Score = curScore.xam + curScore.Pract;

            string success = curScore.xx[0] + " " + curScore.xx[1] + " " +
                curScore.xx[2] + " " + curScore.xx[3] + " " + curScore.Score + " Success";
            listBox2.Items.Add(success);
        }
    }                  
}

请注意，从 面向对象编程 的角度来看，此代码的 none 是正确的。代码可以大大改进。我只是拿了你现有的代码并将其更改为“让它工作”......至少我认为它会;如果没有，它应该会给你一些关于在哪里进行更改的好主意。

c# - 我的项目没有从 listbox1 移动到 listbox2

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listboxitem