有没有办法为 C# 中的自定义 class 的通用集合创建方法？

Question

I was wondering if this was at all possible. Since I´m not all right there with IEnumerator/IEnumerables, there might be a way to do it I don´t know. I imagine it would go something like this:

public namespace cookietest
{
    public static class Program{
        public List<Cookie> cookies = new List<Cookie>();
        CookieJar cookieJar = cookies.ToCookieJar();
    }

    public class Cookie{
        public int size;
        //Implementatin of ToCookieJar()
    }
}

I understand that there are better design solutions and that this isn't really a problem, but I got curious and couldn't find anything about it.

Answer 1

What you are looking for is called extension methods .

Given a reference type, such as List<T> , you can "extend" it with your own methods like this:

public static class Program
{
    public List<Cookie> cookies = new List<Cookie>();
    CookieJar cookieJar = cookies.ToCookieJar();
}

public class Cookie
{
    public int size;
}

public static class CookieExtensions
{
    public static CookieJar ToCookieJar(this IEnumerable<Cookie> list)
    {
        return new CookieJar(list);
    }
}