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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		var samples = new[] {
  10. 			new Category { Id = 1, ParentCategoryId = 8, SortOrder = 1, Text = "Firefall" },
  11. 			new Category { Id = 2, ParentCategoryId = 8, SortOrder = 2, Text = "Left 4 Dead 2" },
  12. 			new Category { Id = 3, ParentCategoryId = 8, SortOrder = 3, Text = "Renegade X" },
  13. 			new Category { Id = 4, ParentCategoryId = 2, SortOrder = 2, Text = "Survival" },
  14. 			new Category { Id = 5, ParentCategoryId = 0, SortOrder = 1, Text = "General" },
  15. 			new Category { Id = 6, ParentCategoryId = 8, SortOrder = 4, Text = "Battlefield 4" },
  16. 			new Category { Id = 7, ParentCategoryId = 2, SortOrder = 1, Text = "Versus" },
  17. 			new Category { Id = 8, ParentCategoryId = 0, SortOrder = 2, Text = "Games" },
  18. 			new Category { Id = 9, ParentCategoryId = 0, SortOrder = 3, Text = "Army Restricted Area" },
  19. 			new Category { Id = 10, ParentCategoryId = 9, SortOrder = 1, Text = "Kool Kids Klub" }
  20. 		};
  21.  
  22. 		var categories = new List<Category>(samples);
  23.  
  24. 		// hierarchycal
  25. 		var categoryTree = CategoryTree.Create(categories, o => o.ParentCategoryId == 0);
  26. 		// recursively called Console.WriteLine on every node
  27. 		PrintNodes(categoryTree);
  28.  
  29. 		Console.WriteLine(new string('-',80));
  30.  
  31. 		var flatTree = categoryTree.Flatten();
  32. 		foreach(var category in flatTree) {
  33. 			Console.WriteLine(category.DisplayText);
  34. 		}
  35. 	}
  36.  
  37. 	public static void PrintNodes(CategoryTree tree) {
  38. 		if (tree == null || !tree.Any()) return;
  39.  
  40. 		foreach(var node in tree) {
  41. 			Console.WriteLine(node.DisplayText);
  42. 			PrintNodes(node.Children);
  43. 		}
  44. 	}
  45. }
  46.  
  47. public class Category {
  48. 	public int Id { get; set; }
  49. 	public int ParentCategoryId { get; set; }
  50. 	public int SortOrder { get; set; }
  51. 	public string Text { get; set; }
  52. }
  53.  
  54. public class CategoryNode : Category {
  55.   public CategoryNode(Category category) {
  56.   	Id = category.Id;
  57. 	ParentCategoryId = category.ParentCategoryId;
  58. 	SortOrder = category.SortOrder;
  59. 	Text = category.Text;
  60.   }
  61.  
  62.   public CategoryTree Children { get; set; }
  63.   public int Level { get; set;}
  64.   public string DisplayText { 
  65.    	get {
  66.    	  return string.Concat(new string('.', Level*2), Text);	
  67.  	}
  68.   }
  69. }
  70.  
  71. public class CategoryTree : IEnumerable<CategoryNode> {
  72. 	private List<CategoryNode> innerList = new List<CategoryNode>();
  73.  
  74. 	public CategoryTree(IEnumerable<CategoryNode> nodes) {
  75. 		innerList = new List<CategoryNode>(nodes);	
  76. 	}
  77.  
  78. 	public IEnumerator<CategoryNode> GetEnumerator()
  79.     {
  80.         return innerList.GetEnumerator();
  81.     }
  82.  
  83.     System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
  84.     {
  85.         return this.GetEnumerator();
  86.     }
  87.  
  88. 	public IEnumerable<CategoryNode> Flatten() {
  89. 	  foreach(var category in innerList.OrderBy(o => o.SortOrder)) {
  90. 	  	yield return category;
  91. 	  	if (category.Children != null) {
  92. 	  	  foreach(var child in category.Children.Flatten()) {
  93. 	  		  yield return child;
  94. 	  	  }
  95. 	  	}
  96. 	  }
  97.    }
  98.  
  99.    public static CategoryTree Create(IEnumerable<Category> categories, Func<Category, bool> parentPredicate, int level = 0) {
  100. 		var nodes = categories
  101. 			.Where(parentPredicate)
  102. 			.OrderBy(o => o.SortOrder)
  103. 			.Select(item => 
  104. 				new CategoryNode(item) { 
  105. 					Level = level,
  106. 					Children = Create(categories, o => o.ParentCategoryId == item.Id, level + 1)
  107. 				});
  108.  
  109. 		return new CategoryTree(nodes);
  110. 	}
  111. }
Success #stdin #stdout 0.05s 35016KB
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stdin
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Standard input is empty
stdout
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General
Games
..Firefall
..Left 4 Dead 2
....Versus
....Survival
..Renegade X
..Battlefield 4
Army Restricted Area
..Kool Kids Klub
--------------------------------------------------------------------------------
General
Games
..Firefall
..Left 4 Dead 2
....Versus
....Survival
..Renegade X
..Battlefield 4
Army Restricted Area
..Kool Kids Klub
https://ideone.com/ejOfrr
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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