13

我通过省略 totalFee 字段成功编译并运行了下面的源代码。如何将 totalFee 写入该程序，以便准确计算每项工作的总费用（费率 * 时间）？下面，你会看到我尝试使用一种方法；这产生了错误 CS0051（不一致的可访问性：参数类型 'Job' 比方法 'AddJobs.TotalPay(Job)' 更难访问）。

此源代码是对以下分配的响应：

“为 Harold 的家庭服务设计一个工作类。该类包含四个数据字段——工作描述（例如，“清洗窗户”）、完成工作的时间（例如，3.5）、每小时收费工作（例如，25.00 美元）和工作的总费用（每小时费率乘以小时数）。包括用于获取和设置除总费用之外的每个字段的属性 - 该字段将是只读的，并且每次都会计算其值设定小时费或小时数。重载 + 运算符，以便可以添加两个作业。两个作业的总和是一个新作业，其中包含两个原始作业的描述（用“和”连接）、原始作业的时间总和以及原始作业的平均小时费率。编写一个 Main() 函数来演示所有方法都能正常工作。将文件另存为 DemoJobs.cs。”

Microsoft® Visual C#® 2008，面向对象编程简介，3e，Joyce Farrell

这是源代码：

using System;

public class AddJobs
{
  private double totalFee;

  public AddJobs(double totalFee)
  {
     TotalFee = totalFee;
  }

  public static void Main()
  {
     Job job1 = new Job("washing windows", 5.00, 25.00);
     Job job2 = new Job("walking a dog", 3.00, 11.00);
     Job job3;
     job3 = job1 + job2;

     Console.WriteLine("The first job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job1.Description, job1.Time, job1.Rate.ToString("C"));
     TotalPay(job1);

     Console.WriteLine("The second job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job2.Description, job2.Time, job2.Rate.ToString("C"));
     TotalPay(job2);         

     Console.WriteLine("The third job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job3.Description, job3.Time, job3.Rate.ToString("C"));
     TotalPay(job3);
  }

  public static void TotalPay(Job method)
  {

     double totalFee = Job.rate * Job.time;
     Console.WriteLine("The total fee is: {0}", TotalFee.ToString("C"));
  }
}

class Job
{

  public Job(string description, double time, double rate)
  {
     Description = description;

     Time = time;

     Rate = rate;
  }

  public static Job operator+(Job first, Job second)
  {
     string newDescription = first.Description + " and " + second.Description;

     double newTime = first.Time + second.Time;

     double newRate = (first.Rate + second.Rate) / 2;

     double newTotalFee = newRate * newTime;

     return(new Job(newDescription, newTime, newRate));
  }

  public string Description {get; set;}
  public double Time {get; set;}
  public double Rate {get; set;}
}
4

4 回答 4

40

你没有为你的类指定可见性修饰符，这使它成为内部的。

尝试更改此行：

class Job

对此：

public class Job
于 2010-10-30T21:12:40.257 回答
8

这意味着您正在访问一个不公开的类。像这样公开班级：

public class Job
{

  public Job(string description, double time, double rate)
  {
     Description = description;

     Time = time;

     Rate = rate;
  }
于 2013-05-08T13:34:35.430 回答
1

你是对的 Lasse V. Karlsen 你确实需要在 Job 类的前面添加一个公共访问修饰符。查看方法点“A”显示表示该人试图访问私有字段的语法错误的情况。当该人应该尝试访问该字段的属性而不是访问作为私有字段的字段时。

public static void TotalPay(Job method) { A: A: double totalFee = Job.rate * Job.time; Console.WriteLine("总费用为：{0}", TotalFee.ToString("C")); } }

有几个不同的地方有类似的错误只是遵循所有“A”的使用系统；

公共类 AddJobs { 私人双总费用；

                    //A:
public AddJobs(double TotalFee)
{ //A:
    totalFee = TotalFee;
}

public static void Main()
{
    Job job1 = new Job("washing windows", 5.00, 25.00);
    Job job2 = new Job("walking a dog", 3.00, 11.00);
    Job job3;
    job3 = job1 + job2;

    Console.WriteLine("The first job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job1.Description, job1.Time, job1.Rate.ToString("C"));
    TotalPay(job1);

    Console.WriteLine("The second job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job2.Description, job2.Time, job2.Rate.ToString("C"));
    TotalPay(job2);

    Console.WriteLine("The third job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job3.Description, job3.Time, job3.Rate.ToString("C"));
    TotalPay(job3);
}

public static void TotalPay(Job method)
{

    double totalFee = method.Rate * method.Time;
    Console.WriteLine("The total fee is: {0}", totalFee.ToString("C"));
}

}

公共类工作{

public Job(string description, double time, double rate)
{
    Description = description;

    Time = time;

    Rate = rate;
}

public static Job operator +(Job first, Job second)
{
    string newDescription = first.Description + " and " + second.Description;

    double newTime = first.Time + second.Time;

    double newRate = (first.Rate + second.Rate) / 2;

    double newTotalFee = newRate * newTime;

    return (new Job(newDescription, newTime, newRate));
}

public string Description { get; set; }
public double Time { get; set; }
public double Rate { get; set; }

}

于 2011-02-16T22:18:38.853 回答
0 
using System;

public class AddJobs
{
    private double totalFee;



    public AddJobs(double TotalFee)
    {
        totalFee = TotalFee;
    }

    public static void Main()
    {
        Job job1 = new Job("washing windows", 5.00, 25.00);
        Job job2 = new Job("walking a dog", 3.00, 11.00);
        Job job3;
        job3 = job1 + job2;

        Console.WriteLine("The first job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job1.Description, job1.Time, job1.Rate.ToString("C"));
        TotalPay(job1);

        Console.WriteLine("The second job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job2.Description, job2.Time, job2.Rate.ToString("C"));
        TotalPay(job2);

        Console.WriteLine("The third job's description: {0} \nTotal time needed to complete the job: {1} hours \nHourly fee: {2} per hour", job3.Description, job3.Time, job3.Rate.ToString("C"));
        TotalPay(job3);
    }

    public static void TotalPay(Job method)
    {

        double totalFee = method.Rate * method.Time;
        Console.WriteLine("The total fee is: {0}", totalFee.ToString("C"));
    }
}

class Job
{

    public Job(string description, double time, double rate)
    {
        Description = description;

        Time = time;

        Rate = rate;
    }

    public static Job operator +(Job first, Job second)
    {
        string newDescription = first.Description + " and " + second.Description;

        double newTime = first.Time + second.Time;

        double newRate = (first.Rate + second.Rate) / 2;

        double newTotalFee = newRate * newTime;

        return (new Job(newDescription, newTime, newRate));
    }

    public string Description { get; set; }
    public double Time { get; set; }
    public double Rate { get; set; }
}
于 2011-02-16T21:30:52.677 回答