为什么我得到一个＆QUOT;不包含一个构造函数的参数0＆QUOT;错误？ C＃ [英] Why am I getting a "does not contain a constructor that takes 0 arguments" error? C#

问题描述

在我的形式加载，我有这样的code：

On my form load, I have this code:

    private void Form1_Load(object sender, EventArgs e)
    {
        CharityCyclists cyclist1 = new CharityCyclists();
        CharityCyclists cyclist2 = new CharityCyclists("a", 1, "Finished", 0, 0, 0, "One Wheel", 1, 500);

        cyclist1.Type = "Novelty Charity Cyclist";
        cyclist1.Number = 1;
        cyclist1.Finished = "Not Finished";
        cyclist1.Hours = 0;
        cyclist1.Mins = 0;
        cyclist1.Secs = 0;
        cyclist1.Bicycle = "Tricycle";
        cyclist1.Wheels = 3;
        cyclist1.FundsRaised = 300;
    }

不过，我得到一个错误说'CycleEvent.CharityCyclists'不包含一个构造函数的参数0，它说的错误与code的这部分做的：

However, I'm getting a error saying "'CycleEvent.CharityCyclists' does not contain a constructor that takes 0 arguments", it says the error is to do with this part of the code:

CharityCyclists cyclist1 = new CharityCyclists();

下面是我的CharityCyclists类：

Here is my CharityCyclists class:

class CharityCyclists : Cyclists
{
    private string bicycle;
    private int wheels;
    private double fundsRaised;

    public string Bicycle
    {
        get { return bicycle; }
        set { bicycle = value; }
    }

    public int Wheels
    {
        get { return wheels; }
        set { wheels = value; }
    }

    public double FundsRaised
    {
        get { return fundsRaised; }
        set { fundsRaised = value; }
    }

    public CharityCyclists(String type, int number, String finished, int hours, int mins, int secs, string bicycle, int wheels, double fundsRaised) : base(type, number, finished, hours, mins, secs, fundsRaised)
    {
        this.bicycle = bicycle;
        this.wheels = wheels;
        this.FundsRaised = fundsRaised;
    }

    public override string ToString()
    {
        return base.ToString() + " riding a " + bicycle + " with " + wheels + " wheels" ;
    }
}

谢谢！

推荐答案

这是因为 CharityCyclists 类没有一个构造函数没有参数。

That is because the CharityCyclists class does not have a constructor that takes no arguments.

C＃编译器将生成默认的构造函数为你的如果没有定义其他构造的。
如果你自己定义构造函数（你有），C＃编译器不会生成一个默认的构造。

The C# compiler will generate the default constructor for you, if you define no other constructors. If you define a constructor yourself (as you have), the C# compiler will not generate a default constructor.

如果你想允许 CharityCyclists 不带参数的构造，这增加code到类：

If you want to allow CharityCyclists to be constructed without parameters, add this code to the class:

public CharityCyclists() 
{}

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