Question

我是c＃的新手（我从一月份开始），我需要帮助处理我写的代码。在出现错误的所有行上，它说

期望的类，委托，枚举，接口或结构

这是我的代码：

using System;

namespace pawlowski_Catherine_Lab3

{
    public class Course
    {
        protected string description;
        protected string prefix;
        protected double number;
        protected double hours;

    }
    public Course ()
    {
        this.hours="3.00";
    }
    public Course(string description, string prefix, double number, double hours)
    {
        this.description=description;
        this.prefix=prefix;
        this.number=number;
        this.hours=hours;
    }
    public override string ToString ()
    {
        return string.Format ("Course: "+prefix+"\nCourse Number: "+number+"\nDescription: "+description+"\nCredit hours: "+hours);
    }
}

差不多，错误在哪里，除了第一个之外，在开头就是公开的。请帮我弄清楚我做错了什么，以便将来我自己解决。

Answer 1

这可能会被关闭，所以：

这里有你的（格式化）：

using System;

namespace pawlowski_Catherine_Lab3 {
    public class Course {
        protected string description;
        protected string prefix;
        protected double number;
        protected double hours;

    }
    public Course() {
        this.hours = "3.00";
    }
    public Course(string description, string prefix, double number, double hours) {
        this.description = description;
        this.prefix = prefix;
        this.number = number;
        this.hours = hours;
    }
    public override string ToString() {
        return string.Format("Course: " + prefix + "\nCourse Number: " + number + "\nDescription: " + description + "\nCredit hours: " + hours);
    }
}

这里有你应该拥有的东西（构造函数和方法是类的一部分）：

using System;

namespace pawlowski_Catherine_Lab3 {
    public class Course {
        protected string description;
        protected string prefix;
        protected double number;
        protected double hours;

        public Course() {
            this.hours = "3.00";
        }
        public Course(string description, string prefix, double number, double hours) {
            this.description = description;
            this.prefix = prefix;
            this.number = number;
            this.hours = hours;
        }
        public override string ToString() {
            return string.Format("Course: " + prefix + "\nCourse Number: " + number + "\nDescription: " + description + "\nCredit hours: " + hours);
        }
    }
}

正确的缩进是你的朋友。

Answer 2

您应该将所有方法和属性放在类中声明。

类似的东西：

using System;
namespace pawlowski_Catherine_Lab3
{
    public class Course
    {
        protected string description;
        protected string prefix;
        protected double number;
        protected double hours;

        public Course ()
        {
            this.hours="3.00";
        }
        public Course(string description, string prefix, double number, double hours)
        {
            this.description=description;
            this.prefix=prefix;
            this.number=number;
            this.hours=hours;
        }
        public override string ToString ()
        {
            return string.Format ("Course: "+prefix+"\nCourse Number: "+number+"\nDescription: "+description+"\nCredit hours: "+hours);
        }
    }
}

Answer 3

在这里：

public class Course
{
    protected string description;
    protected string prefix;
    protected double number;
    protected double hours;
} // Get rid of this line here
public Course ()
{
    ...

Answer 4

在类范围内声明您的承包商和方法。

替换您的代码用这个

using System;

namespace pawlowski_Catherine_Lab3
{
    public class Course
    {
        protected string description;
        protected string prefix;
        protected double number;
        protected double hours;

        public Course ()
        {
            this.hours="3.00";
        }
        public Course(string description, string prefix, double number, double hours)
        {
            this.description=description;
            this.prefix=prefix;
            this.number=number;
            this.hours=hours;
        }
        public override string ToString ()
        {
            return string.Format ("Course: "+prefix+"\nCourse Number:     "+number+"\nDescription: "+description+"\nCredit hours: "+hours);
        }
    }
}

我的代码有什么问题？

4 个答案: