均分list

public static class ListExtension

{

    public static IEnumerable<List<T>> SplitListByNumber<T>(this List<T> locations, int nSize = 30)

    {

        for (int i = 0; i < locations.Count; i += nSize)

        {

            yield return locations.GetRange(i, Math.Min(nSize, locations.Count - i));

        }

    }

    public static List<List<T>> SplitListToNParts<T>(this List<T> list, int parts = 10)

    {

        var i = 0;

        var splits = from item in list

        group item by i++ % parts into part

        select part.ToList();

        return splits?.ToList();

    }

}