最快从集合转换为列表<T>

Question

我想避免的:

ManagementClass m = new ManagementClass("Win32_LogicalDisk");

ManagementObjectCollection managementObjects = m.GetInstances();

List<ManagementObject> managementList = new List<ManagementObject>();

foreach(ManagementObject m in managementObjects){

    managementList.Add(m);

}

有没有办法将该集合放入一个看起来像这样的列表:

List<ManagementObject> managementList = new List<ManagementObjec>(collection_array);

Answer 1

什么版本的框架？使用3.5你可能会使用:

List<ManagementObject> managementList = managementObjects.Cast<ManagementObject>().ToList();

(编辑以删除更简单的版本;我检查并ManagementObjectCollection仅实现非泛型IEnumerable形式)

Answer 2

你可以用

using System.Linq;

这将为ICollection <>提供ToList <>扩展方法

Answer 3

managementObjects.Cast<ManagementBaseObject>().ToList();是一个不错的选择。

您可以通过预初始化列表容量来提高性能：

    public static class Helpers
    {
        public static List<T> CollectionToList<T>(this System.Collections.ICollection other)
        {
            var output = new List<T>(other.Count);

            output.AddRange(other.Cast<T>());

            return output;
        }
    }