使用 linq to sql 按多个属性排序

Question

我有一个清单，我想按这样订购

public class Refund {
    public int RefundStatus { get; set; }
    public DateTime SumbitTime { get; set; }
}

先按 RefundStatus 排序，然后：

if RefundStatus == 1 then by SumbitTime ascending,

if RefundStatus != 1 则 SumbitTime 降序。

我应该如何通过 linq to sql？

更新：我按照 Michal Turczyn 进行了更改。但是无法翻译日志输出显示

Microsoft.EntityFrameworkCore.Query:Warning: The LINQ expression 'orderby [p].RefundStatus asc, ([p].SumbitTime.Ticks * Convert(IIF(([p].RefundStatus == 1), 1, -1), Int64)) asc, EF.Property(?[p]?, "Id") asc' could not be translated and will be evaluated locally. Microsoft.EntityFrameworkCore.Query:Warning: The LINQ expression 'orderby [p].RefundStatus asc, ([p].SumbitTime.Ticks * Convert(IIF(([p].RefundStatus == 1), 1, -1), Int64)) asc, EF.Property(?[p]?, "Id") asc' could not be translated and will be evaluated locally.

Answer 1

如果我正确理解你的问题，这应该能满足你的需求。

var sorted = refundList.GroupBy(refund => refund.RefundStatus)
    .SelectMany(
        group => group.Key == 1 
        ? group.OrderBy(p => p.SumbitTime)
        : group.OrderByDescending(p => p.SumbitTime))
    .ToList();

Answer 2

我会按照以下方式进行：

List<Refund> refundList = new List<Refund>();
// populate your list
refundList = refundList
    // here you could also use:
    //.OrderBy(r => r.RefundStatus)
    // but I don't know if you want it this way
    .OrderBy(r => (r.RefundStatus == 1 ? 1 : -1))
    .ThenBy(r => r.SubmitTime.Ticks * (r.RefundStatus == 1 ? 1 : -1))
    .ToList();

想法是，当您乘以 DateTime 中的 -1 个刻度数时，它会按降序排列，而不必将您的集合分成两部分。

Answer 3

您可以使用以下内容。

var sorted = list.GroupBy(refund => refund.RefundStatus)
                 .OrderBy(x=>x.Key)
                 .SelectMany(
                             group => group.Key == 1 ? 
                             group.OrderBy(p => p.SubmitTime)
                             : group.OrderByDescending(p => p.SubmitTime));

完整示例。

        var random = new Random();
        var list = Enumerable.Range(1, 10)
            .Select(x => 
                new Refund
                {
                    RefundStatus = random.Next(0,2),
                    SubmitTime = DateTime.Now.AddMinutes(x)
                });

其中退款定义为

public class Refund
{
    public int RefundStatus { get; set; }
    public DateTime SubmitTime { get; set; }
}

示例输出

**排序前

Refund = 0 - SubmitTime = 22-03-2019 14:22:16
Refund = 1 - SubmitTime = 22-03-2019 14:23:16
Refund = 0 - SubmitTime = 22-03-2019 14:24:16
Refund = 0 - SubmitTime = 22-03-2019 14:25:16
Refund = 0 - SubmitTime = 22-03-2019 14:26:16
Refund = 1 - SubmitTime = 22-03-2019 14:27:16
Refund = 0 - SubmitTime = 22-03-2019 14:28:16
Refund = 1 - SubmitTime = 22-03-2019 14:29:16
Refund = 0 - SubmitTime = 22-03-2019 14:30:16
Refund = 1 - SubmitTime = 22-03-2019 14:31:16

排序后

Refund = 0 - SubmitTime = 22-03-2019 14:31:16
Refund = 0 - SubmitTime = 22-03-2019 14:29:16
Refund = 0 - SubmitTime = 22-03-2019 14:28:16
Refund = 0 - SubmitTime = 22-03-2019 14:26:16
Refund = 0 - SubmitTime = 22-03-2019 14:23:16
Refund = 1 - SubmitTime = 22-03-2019 14:22:16
Refund = 1 - SubmitTime = 22-03-2019 14:24:16
Refund = 1 - SubmitTime = 22-03-2019 14:25:16
Refund = 1 - SubmitTime = 22-03-2019 14:27:16
Refund = 1 - SubmitTime = 22-03-2019 14:30:16

使用 linq to sql 按多个属性排序

Order by multiple properties with linq to sql

c#

linq

linq-to-sql