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我正在创建一个 C# GUI 应用程序，但我的循环出现问题，该应用程序获取 .txt 文件，其中包含学生驾驶员考试答案 A、B、C 或 D 的每个分隔行，然后将其与正确答案进行比较代码中的数组。我的循环总是告诉我所有答案都不正确，无论答案是正确还是不正确。

我的界面

在此处输入图像描述 在此处输入图像描述

我的代码：

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

namespace Mohammad_Saad_Assignment_1_Part_2_Sec_B
{
public partial class Form1 : Form
{
    //Acutal answers
    string[] correctAnswers = { "B", "D", "A", "A", "C", "A", "B", "A", "C", "D", "B", 
            "C", "D", "A", "D", "C", "C", "B", "D", "A" };

    //Student answers array of size 20
    string[] studentAnswers = new string[20];

    public Form1()
    {

        InitializeComponent();
    }

    private void btnOpen_Click(object sender, EventArgs e)
    {
        listBox2.Items.AddRange(correctAnswers);

        //Opening a new file.
        OpenFileDialog open = new OpenFileDialog();
        //Dismiss user cancelation so application dosnt crash.
        if (open.ShowDialog() == DialogResult.OK)
        {
            path.Text = open.FileName;
        }

        StreamReader sReader = new StreamReader(open.FileName);
        int index = 0;

        while (index < correctAnswers.Length && !sReader.EndOfStream)
        {
            correctAnswers[index] = sReader.ReadLine();
            index++;
        }
        foreach (string str in correctAnswers)
        {
            listBox1.Items.Add(str);
        }

        btnOpen.Enabled = false;

    }

    private void button1_Click(object sender, EventArgs e)
    {
        int i = 0;
        int questionNumber = 1;
        int answersCorrect = 0;
        int answersIncorrect = 0;
        do
        {
            if (studentAnswers[i] == correctAnswers[i])
            {
                answersCorrect++;
            }
            if (studentAnswers[i] != correctAnswers[i])
            {
                listBox3.Items.Add("Question " + questionNumber);
                listBox3.Items.Add("Incorrect");
                answersIncorrect++;
            }
            i++;
            questionNumber++;
        }

        while (i != 20);
        lblCorrect.Text = answersCorrect.ToString();
        lblInCorrect.Text = answersIncorrect.ToString();
        if (answersCorrect >= 15)
        {
            txtResults.Text = "PASS";

        }
        if (answersCorrect < 15)
        {
            txtResults.Text = "FAIL";

        }

        btnMark.Enabled = false;
    }

    private void btnClear_Click(object sender, EventArgs e)
    {
        btnOpen.Enabled = true;
        btnMark.Enabled = true;
        listBox1.Items.Clear();
        listBox3.Items.Clear();
        txtResults.Clear();
    }
}
}

问题是我认为在标记按钮（按钮 1）中非常感谢任何帮助。

4

3 回答 3

2

通常，使用调试器并逐步执行代码会对您有所帮助。

于 2013-09-28T07:04:21.663 回答
2

当您阅读学生答案时，您会看到这一行：

correctAnswers[index] = sReader.ReadLine();

它应该是：

studentAnswers[index] = sReader.ReadLine();
于 2013-09-28T06:24:19.367 回答
2

更改此代码块：

while (index < correctAnswers.Length && !sReader.EndOfStream)
{
    correctAnswers[index] = sReader.ReadLine();
    index++;
}
foreach (string str in correctAnswers)
{
    listBox1.Items.Add(str);
}

至：

while (index < correctAnswers.Length && !sReader.EndOfStream)
{
    studentAnswers[index] = sReader.ReadLine();
    index++;
}
foreach (string str in studentAnswers)
{
    listBox1.Items.Add(str);
}
于 2013-09-28T06:27:09.497 回答