Question

我似乎无法找到修复代码的错误。我得到了一个测试人员课程，并被告知要使正确运行测试人员所需的课程。这是我遇到问题的代码：

测试人员类

using System;
using School;

namespace School
{
    class Tester
    {
        static void Main(string[] args)
        {
            Faculty scienceFac = University.createFaculty("Science");
        }
    }
}

教师班级

using System;

namespace School
{

public class Faculty
{
    public String faculty;

    public Faculty(String faculty)
    {
        this.faculty = faculty;
    }
}
}

大学课程

using System;

namespace School
{

public class University
{
    private int numOfFaculties;

    public University()
    {
        numOfFaculties = 0;
    }

    public void createFaculty(String faculty)
    {
        numOfFaculties++;
        new Faculty(faculty);//?????
    }

    public int numberOfFaculties()
    {
        return numOfFaculties;  
    }
}
}

只有测试人员显示错误，这是我引用命名空间的错误吗？

Answer 1

除了评论中其他人提到的问题：

大学班级“记住”院系的数量但不“记住”院系本身
您无需将整数字段初始化为0
没有必要使用int numOfFaculties字段和int numberOfFaculties()方法 - 这就是属性的用途：public int NumberOfFaculties { get; private set; }可以很好地完成。

我建议您的University课程必须是这样的：

public class University
{
    private readonly List<Faculty> _faculties = new List<Faculty>();
    public List<Faculty> Faculties { get { return _faculties; } }

    public Faculty CreateFaculty(string facultyName)
    {
        var faculty = new Faculty(facultyName);
        _faculties.Add(faculty);
        return faculty;
    }

    public int NumberOfFaculties { get { return _faculties.Count; } }
}

CreateFaculty()创建一个Faculty，将其存储在University对象内的List中，NumberOfFaculties计数只是列表的.Count。

因此，要创建一所拥有科学教员的大学，您可以这样称呼：

University uni = new University();
Faculty scienceFac = uni.CreateFaculty("Science");

Answer 2

您需要更改createFaculty以返回Faculty的实例。

public Faculty createFaculty(String faculty)
{
    numOfFaculties++;
    return new Faculty(faculty);
}

您还需要在测试项目中创建一个University实例; createFaculty不是静态的。

static void Main(string[] args)
{
    var instance = new University();
    var scienceFac = instance.createFaculty("Science");
}

C＃ - 缺少汇编/引用，面向对象的编程

2 个答案: