解决错误“没有给出对应于所需形式参数的参数"? [英] Resolve error 'there is no argument given that corresponds to required formal parameter'?

问题描述

我有以下代码，在 C# Visual Studio 2015 中编译时出现错误.

I have following code where I'm getting error while compiling in C# visual Studio 2015.

class Oval:Shape
{
    private double major_axis, minor_axis;
    public Oval(double Major_Axis, double Minor_Axis)
    {
      major_axis = Major_Axis;
      minor_axis = Minor_Axis;
    } //Constructor
}
class Circle:Oval
{
    private double radius;
    public Circle(double Circle_Radius) // Getting Error on this line
    {
      radius = Circle_Radius;  
    } //constructor
}

推荐答案

修复您的错误:

错误是由于缺少无参数构造函数(或者您在构造函数中没有使用 base() 方法(就像 user3185569 所说的那样)

The error occurs due to the lack of a parameterless constructor (or your lack of using the base() method in your constructor (just like user3185569 had said)

修复您的代码:

很明显，您似乎缺乏 .NET 的一些基础知识，因此我决定重新编写您的代码，并牢记以下几点:

It clearly seems you are lacking some basics in .NET so I've decided to give a re-writing to your code with the following things in mind:

一个.约定

有一些关于适用于您的代码的通用约定的规则.

There are some rules about common conventions that should apply to your code.

成员通常以 m 或 _ 开头，然后是 memberName(驼峰式大小写).

Members usually begin with either m or _ and then the memberName (camel casing).

属性通常被写成PropertyName，同样适用于方法.

Properties are usually written regularly as PropertyName and same applies to methods.

参数和变量只是像parameterName

B.访问修饰符

我不知道您的 Oval 和 circle 的用途，但我假设您想在 Oval 和 Circle 之外访问它们.

I don't know the use of your Oval and circle but I assume you'd want to access them outside of Oval and Circle.

我认为最好在此处参考您以阅读有关该主题的更多信息:https://msdn.microsoft.com/en-us/library/ms173121.aspx

I think it would be the best to reference you to here to read some more about the topic: https://msdn.microsoft.com/en-us/library/ms173121.aspx

我重新编写了您的代码以包含所有这些提示(并解决您的问题)

I've re-written your code to include all those tips (and also fix your issue)

public class Oval:Shape
{       
    //Constructor
    public Oval(double majorAxis, double minorAxis)
    {
        MajorAxis=majorAxis;
        MinorAxis=minorAxis;
    } 
    
    protected double MajorAxis{ get; set; }     
    protected double MinorAxis{ get; set; }     
}    

public class Circle:Oval
{       
    //Constructor
    public Circle(double radius): base(radius,radius)
    {
        radius = Circle_Radius;  
    }
    
    public double Radius
    {
        get
        {
            return MajorAxis;
        }
        set
        {
            MajorAxis = value;
            MinorAxis = value;
        }       
    }
}

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