将C#集合拆分为相等的部分,保持排序

Question

我正在尝试将一个集合拆分成多个集合,同时保持我对集合的排序.我尝试使用以下扩展方法,但它错误地打破了它们.基本上,如果我要查看集合中的项目,与加入的分解集合相比,顺序应该相同.这是我使用的代码不起作用:

public static IEnumerable<IEnumerable<T>> Split<T>(this IEnumerable<T> list, int parts)
        {
            int i = 0;
            var splits = from name in list
                         group name by i++ % parts into part
                         select part.AsEnumerable();
            return splits;
        }

• int parts =子枚举数

Answer 1

I had to make use of this to compare a list of objects to one another in groups of 4... it will keep the objects in the order that the original possessed. Could be expanded to do something other than 'List'

/// <summary>
/// Partition a list of elements into a smaller group of elements
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <param name="totalPartitions"></param>
/// <returns></returns>
public static List<T>[] Partition<T>(List<T> list, int totalPartitions)
{
    if (list == null)
        throw new ArgumentNullException("list");

    if (totalPartitions < 1)
        throw new ArgumentOutOfRangeException("totalPartitions");

    List<T>[] partitions = new List<T>[totalPartitions];

    int maxSize = (int)Math.Ceiling(list.Count / (double)totalPartitions);
    int k = 0;

    for (int i = 0; i < partitions.Length; i++)
    {
        partitions[i] = new List<T>();
        for (int j = k; j < k + maxSize; j++)
        {
            if (j >= list.Count)
                break;
            partitions[i].Add(list[j]);
        }
        k += maxSize;
    }

    return partitions;
}