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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. class Product {
  6.    public int ID;
  7.    public int CategoryID;
  8. }
  9.  
  10. public class Test
  11. {
  12. 	public static void Main()
  13. 	{
  14. 	    var products = new List<Product>();
  15.             products.Add(new Product() { ID = 1, CategoryID = 1 });
  16.             products.Add(new Product() { ID = 2, CategoryID = 1 });
  17.             products.Add(new Product() { ID = 3, CategoryID = 7 });
  18.             products.Add(new Product() { ID = 4, CategoryID = 8 });
  19.             products.Add(new Product() { ID = 5, CategoryID = 9 });
  20.             products.Add(new Product() { ID = 6, CategoryID = 10 });
  21.  
  22.             var catIDs = new[] { 1, 8, 9 };
  23.             var ordered = products
  24.                 .OrderByDescending(p => catIDs.Contains(p.CategoryID))
  25.                 .ThenBy(p => p.CategoryID);
  26.  
  27.             Console.Write(
  28.                 string.Join(Environment.NewLine, 
  29.                 ordered.Select(p => 
  30.                     String.Format("ID={0} CatID={1}",p.ID,p.CategoryID)).ToArray()));
  31. 	}
  32. }
Success #stdin #stdout 0.05s 37168KB
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stdin
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Standard input is empty
stdout
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ID=1 CatID=1
ID=2 CatID=1
ID=4 CatID=8
ID=5 CatID=9
ID=3 CatID=7
ID=6 CatID=10
https://ideone.com/O462C
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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