Mongo C# 驅動程序排序與自定義方法

Question

情況：我正在使用 MongoDb C# 驅動程序。 我有一個數組string[] values 。 這是我想以某種方式工作的代碼：

var sort = Builders<Something>.Sort.Descending(x => values.Contains(x.Id));

我已經為我的查詢實現了分頁，出於某種原因，我需要一個SortDefinition ，它首先對特定集合中具有 id 的元素進行排序，然后才返回其他項目。

遺憾的是，我意識到內置的 Mongo 驅動程序 Sort 僅允許按字段定義進行排序。

Answer 1

嘗試 IComparable：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication192
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] inputs = { "abcdefg", "stuvwxy", "xyz123", "defghij" };

            string[] outputs = inputs.Select(x => new CustomSort(x)).OrderBy(x => x).Select(x => x.id).ToArray();

        }
    }
    public class CustomSort : IComparable<CustomSort>
    {
        static string[] order = { "def", "abc", "xyz" };
        int index = 0;
        public string id = "";

        public CustomSort(string id)
        {
            this.id = id;
            index = order.Select((x, i) => id.StartsWith(id) ? i : -1).Max(x => x);
        }

        public int CompareTo(CustomSort other)
        {
            int results = 0;
            if (index == -1)
            {
                if (other.index == -1)
                {
                    results = id.CompareTo(other.id);  //neither in list order by string sort
                }
                else
                {
                    results = 1;  //this not i list, other is in list, other < this
                }
            }
            else
            {
                if (other.index == -1)
                {
                    results = -1;  //this in list, othe not in list, this < other
                }
                else
                {
                    index.CompareTo(other.index);  //both in list use index
                }
            }
            return results;
        }

    }
}