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  1. using System;
  2. using System.Collections.ObjectModel;
  3.  
  4. public sealed class Foo
  5. {
  6.     private readonly ObservableCollection<ObservableCollection<string>> _data;
  7.  
  8.     public Foo()
  9.     {
  10.         _data = new ObservableCollection<ObservableCollection<string>>();
  11.         for (var i = 0; i<10; i++)
  12.         {
  13.             var t = new ObservableCollection<string>();
  14.             for (var j = 0; j<10; j++)
  15.             {
  16.                 t.Add(i + "+" + j);
  17.             }
  18.             _data.Add(t);
  19.         }
  20.  
  21.         var tmp = new ObservableCollection<ReadOnlyObservableCollection<string>>();
  22.         foreach (var row in _data)
  23.         {
  24.             tmp.Add(new ReadOnlyObservableCollection<string>(row));
  25.         }
  26.         Data = new ReadOnlyObservableCollection<ReadOnlyObservableCollection<string>>(tmp);
  27.  
  28. 		Console.WriteLine("Initial row count:");
  29.         Console.WriteLine("_data: " + _data.Count);
  30.         Console.WriteLine("Data: " + Data.Count);
  31.  
  32. 		Console.WriteLine("Removing item with index (0,0)");
  33.         RemoveItem(0,0);
  34.  
  35.         Console.WriteLine("Curent item count for 0th row:");
  36.         Console.WriteLine("_data: " + _data[0].Count);
  37.         Console.WriteLine("Data: " + Data[0].Count);
  38.  
  39. 		Console.WriteLine("Removing the 0th row");
  40.         RemoveRow(0);
  41.  
  42. 		Console.WriteLine("Current row count:");
  43.         Console.WriteLine("_data: " + _data.Count);
  44.         Console.WriteLine("Data: " + Data.Count);
  45.     }
  46.  
  47.     public ReadOnlyObservableCollection<ReadOnlyObservableCollection<string>> Data { get; }
  48.  
  49.     public void RemoveItem(int x, int y)
  50.     {
  51.         _data[x].RemoveAt(y); // This does update the UI.
  52.     }
  53.  
  54.     public void RemoveRow(int x)
  55.     {
  56.         _data.RemoveAt(x); // This does not update the UI.
  57.     }
  58. }
  59.  
  60. public class Test
  61. {
  62. 	public static void Main()
  63. 	{
  64. 		var f = new Foo();
  65. 	}
  66. }
Success #stdin #stdout 0s 29936KB
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stdin
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Standard input is empty
stdout
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Initial row count:
_data: 10
Data: 10
Removing item with index (0,0)
Curent item count for 0th row:
_data: 9
Data: 9
Removing the 0th row
Current row count:
_data: 9
Data: 10
https://ideone.com/M3RYcP
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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