铸造IEnumerable T.列出< T> [英] Casting IEnumerable<T> to List<T>

问题描述

我想知道是否可以将IEnumerable强制转换为List.除了将每个项目复制到列表中之外，还有其他方法吗?

I was wondering if it is possible to cast an IEnumerable to a List. Is there any way to do it other than copying out each item into a list?

推荐答案

如已经建议的那样，使用yourEnumerable.ToList().它通过您的IEnumerable枚举，并将内容存储在新的List中.您不一定要复制现有列表，因为您的IEnumerable可能会懒惰地生成元素.

As already suggested, use yourEnumerable.ToList(). It enumerates through your IEnumerable, storing the contents in a new List. You aren't necessarily copying an existing list, as your IEnumerable may be generating the elements lazily.

这正是其他答案所暗示的内容，但更为清楚.这是反汇编，因此您可以确定:

This is exactly what the other answers are suggesting, but clearer. Here's the disassembly so you can be sure:

public static List<TSource> ToList<TSource>(this IEnumerable<TSource> source)
{
    if (source == null)
    {
        throw Error.ArgumentNull("source");
    }
    return new List<TSource>(source);
}

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