C# List 根据传入的分组字段，动态分组

动态分组：

public static class DynamicLinqExtensions
{
    /// <summary>
    /// 分组查询
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="source">数据源</param>
    /// <param name="groupingSelectorKeys">动态指定的列</param>
    /// <param name="groupingKeySelector">所有列的 Lambda 表达式集合</param>
    /// <returns></returns>
    public static IEnumerable<Group<T>> GroupBy<T>(this IEnumerable<T> source, IEnumerable<string> groupingSelectorKeys, Dictionary<string, Func<T, object>> groupingKeySelector)
    {
        var groupedResult = Enumerable.Empty<Group<T>>();
        if (groupingSelectorKeys.Any())
        {
            string selectorType = groupingSelectorKeys.First();
            var selector = groupingKeySelector[selectorType];


            IEnumerable<string> nextSelectorTypes = groupingSelectorKeys.Skip(1);
            groupedResult = source.GroupBy(selector).Select(group =>
            {
                Group<T> newGroup = new Group<T>
                {
                    Type = selectorType,
                    Value = group.Key?.ToString(),
                    Items = group.Select(x => x),
                };
                newGroup.SubGroup = group.GroupBy(nextSelectorTypes, groupingKeySelector);
                return newGroup;
            });
        }

        return groupedResult;
    }
}

 Dictionary<string, Func<VOIODashboardDto, object>> groupingKeySelector = new Dictionary<string, Func<VOIODashboardDto, object>>();
 groupingKeySelector["Brand"] = x => x.Brand;
 groupingKeySelector["Category"] = x => x.Category;
 // 定义要根据哪些属性进行分组  
 string[] groupByProperties = { "Category", "Brand" };
 var groupList = list.GroupBy(groupByProperties, groupingKeySelector);