将范围添加到集合 [英] AddRange to a Collection

问题描述

今天一位同事问我如何将范围添加到集合中.他有一个继承自 Collection 的类.有一个该类型的 get-only 属性已经包含一些项目.他想将另一个集合中的项目添加到属性集合中.他怎么能以 C#3 友好的方式做到这一点?(请注意关于 get-only 属性的约束，这会阻止诸如联合和重新分配之类的解决方案.)

A coworker asked me today how to add a range to a collection. He has a class that inherits from Collection<T>. There's a get-only property of that type that already contains some items. He wants to add the items in another collection to the property collection. How can he do so in a C#3-friendly fashion? (Note the constraint about the get-only property, which prevents solutions like doing Union and reassigning.)

当然，一个带有属性的 foreach.添加将起作用.但是 List 样式的 AddRange 会优雅得多.

Sure, a foreach with Property. Add will work. But a List<T>-style AddRange would be far more elegant.

编写扩展方法很容易:

public static class CollectionHelpers
{
    public static void AddRange<T>(this ICollection<T> destination,
                                   IEnumerable<T> source)
    {
        foreach (T item in source)
        {
            destination.Add(item);
        }
    }
}

但我感觉我正在重新发明轮子.我在 System.Linq 或 morelinq 中没有找到类似的内容.

But I have the feeling I'm reinventing the wheel. I didn't find anything similar in System.Linq or morelinq.

糟糕的设计?只是调用添加?缺少明显的东西?

Bad design? Just Call Add? Missing the obvious?

推荐答案

不，这似乎完全合理.有一个 List.AddRange() 方法基本上就是这样做的，但要求你的集合是一个具体的 List.

No, this seems perfectly reasonable. There is a List<T>.AddRange() method that basically does just this, but requires your collection to be a concrete List<T>.

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