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  1. using System;
  2. using System.Collections;
  3. using System.Collections.Generic;
  4. using System.Linq;
  5.  
  6. public class Product
  7. {
  8. 	public Int32 FormID { get; set; }
  9. 	public String ProductLineDesc { get; set; }
  10. }
  11.  
  12. public class Products : List<Product>
  13. {
  14. 	public Products()
  15. 	{
  16. 		base.Add(new Product { FormID = 1, ProductLineDesc = "abc" });
  17. 		base.Add(new Product { FormID = 2, ProductLineDesc = "abc" });
  18. 		base.Add(new Product { FormID = 1, ProductLineDesc = "xyz" });
  19. 		base.Add(new Product { FormID = 2, ProductLineDesc = "def" });
  20. 		base.Add(new Product { FormID = 3, ProductLineDesc = "abc" });
  21. 		base.Add(new Product { FormID = 3, ProductLineDesc = "xyz" });
  22. 	}
  23. }
  24.  
  25. public class UniqueProductLineDesc : IEqualityComparer<Product>
  26. {
  27. 	public Boolean Equals(Product a, Product b)
  28. 	{
  29. 		if (Object.ReferenceEquals(a, b))
  30. 			return true;
  31.  
  32. 		if (Object.ReferenceEquals(a, null) || Object.ReferenceEquals(b, null))
  33. 			return false;
  34.  
  35. 		return String.Compare(a.ProductLineDesc, b.ProductLineDesc, true) == 0;
  36. 	}
  37.  
  38. 	public Int32 GetHashCode(Product product)
  39. 	{
  40. 		if (Object.ReferenceEquals(product, null))
  41. 			return 0;
  42.  
  43. 		return product.ProductLineDesc == null ? 0 : product.ProductLineDesc.GetHashCode();
  44. 	}
  45. }
  46.  
  47. public class Test
  48. {
  49. 	public static void Main()
  50. 	{
  51. 		Products DB_Products = new Products();
  52.  
  53. 		IEnumerable<Product> products = DB_Products.OrderBy(p => p.FormID).Distinct(new UniqueProductLineDesc()).ToList();
  54. 		foreach (Product product in products)
  55. 		{
  56. 			Console.WriteLine("{0}. {1}", product.FormID, product.ProductLineDesc);
  57. 		}
  58. 	}
  59. }
Success #stdin #stdout 0.05s 37224KB
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stdin
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Standard input is empty
stdout
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1. abc
1. xyz
2. def
https://ideone.com/Vxw8q
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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