错误 CS7036 没有给定的参数对应于所需的形式参数

Question

我在标题中遇到错误，有人可以告诉我我的代码有什么问题吗？

public class Book
{
    public string Distributor { get; set; }
    public string Name { get; set; }
    public int Amount { get; set; }
    public double Price { get; set; }
    public Book(string distributor, string name, int amount, double price)
    {
        this.Distributor = distributor;
        this.Name = name;
        this.Amount = amount;
        this.Price = price;
    }
    public override string ToString()
    {
        string line = string.Format("| {0,15} | {1,15} | {2,5} | {3,6} |", Distributor, Name, Amount, Price);
        return line;
    }
    public override bool Equals(object obj)
    {
        Book book = obj as Book;
        return book.Price == Price;
    }
    public override int GetHashCode()
    {
        return Price.GetHashCode();
    }
    public static Book operator >= (Book book1, Book book2) //the error here
    {
        Book temp = new Book();
        if (book1.Name == book2.Name && book1.Price > book2.Price)
            temp = book1;
        return temp;
    }
    public static Book operator <= (Book book1, Book book2) // and here
    {
        Book temp = new Book();
        if (book1.Name == book2.Name && book1.Price < book2.Price)
            temp = book2;
        return temp;
    }
}

我在 'operator' 行中遇到错误。我希望运算符 '>=' 和 '<=' 查找具有相同名称且价格更高的书籍。

Answer 1

I Want the operator '>=' and '<=' to find books with the same name and which one costs more.

那些运营商不是这么做的。它们会告诉您一个值是否 less/greater 大于或等于另一个值 。因此，他们应该 return bool 而不是 Book。如果他们有不同的名字，你还需要决定 return 什么：

public static bool operator >= (Book book1, Book book2)
{
    if (book1.Name == book2.Name)
       return (book1.Price >= book2.Price);
    else
       return ?? what do you want to return here ??
}
public static bool operator <= (Book book1, Book book2)
{
    if (book1.Name == book2.Name)
       return (book1.Price <= book2.Price);
    else
       return ?? what do you want to return here ??
}

如果这确实是您想要做的，那么我鼓励您也重载 < 和 > 运算符。

错误 CS7036 没有给定的参数对应于所需的形式参数

Error CS7036 There is no argument given that corresponds to the required formal parameter

c#

operators