如何在不依赖于第一个属性的情况下按属性先按属性然后按另一个属性对集合进行排序？

anish 发表于 Dev

安尼什

我想要实现的是先按OrderSummary最高顺序排序Amount，然后依次显示Order给定帐户的集合中的所有其他内容，而不管Amount。预期的结果在代码段中。

 public class OrderSummary
    {
        public string FirstName { get; set; }

        public decimal Amount { get; set; }
    }

    public class Worker
    {
        public List<OrderSummary> Orders { get; set; }

        public Worker()
        {
            Orders = new List<OrderSummary>()
            {
                new OrderSummary() {FirstName = "James", Amount = 10.00m},
                new OrderSummary() {FirstName = "Thomas", Amount = 11.00m},
                new OrderSummary() {FirstName = "Leon", Amount = 13.00m},
                new OrderSummary() {FirstName = "Lori", Amount = 14.00m},
                new OrderSummary() {FirstName = "Thomas", Amount = 16.00m},
                new OrderSummary() {FirstName = "Thomas", Amount = 6.00m},
                new OrderSummary() {FirstName = "James", Amount = 19.00m}
            };
        }

        //sorted by highest amount first
        //then place firstname together regardless of the amount

        //Expected Outcome
        /*
           James 19 -- highest amount followed by all other orders for James regardless of the amount.
         * james 10
         * thomas 16
         * thomas 11
         * thomas 6
         * lori 14
         * leon 13
         */
    }

我的方法是获取所有出现多次的元素，然后找到除第一个元素之外的其他元素在哪个索引处，将其从索引中删除，然后将其添加到第一个元素的索引+ 1中。完成这个？

斯坦利

GroupBy 按照它们在源集合中出现的顺序创建组，因此您可以先按数量排序，然后按名称分组，然后“展平”组：

var results = Orders.OrderByDescending(o => o.Amount)
                    .GroupBy(o => o.FistName)  // the groupings will be in order of the largest amount
                    .SelectMany(g => g);       // flatten the groups

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