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  1. using System;
  2.  
  3. class Layout
  4. {
  5.     string[] _values = new string[100]; // Backing store
  6.  
  7.     public string this[int number]
  8.     {
  9.     get
  10. 	{
  11. 	    // This is invoked when accessing Layout instances with the [ ].
  12. 	    if (number >= 0 && number < _values.Length)
  13. 	    {
  14. 		// Bounds were in range, so return the stored value.
  15. 		return _values[number];
  16. 	    }
  17. 	    // Return an error string.
  18. 	    return "Error";
  19. 	}
  20. 	set
  21. 	{
  22. 	    // This is invoked when assigning to Layout instances with the [ ].
  23. 	    if (number >= 0 && number < _values.Length)
  24. 	    {
  25. 		// Assign to this element slot in the internal array.
  26. 		_values[number] = value;
  27. 	    }
  28. 	}
  29.     }
  30. }
  31.  
  32. class Program
  33. {
  34.     static void Main()
  35.     {
  36. 	// Create new instance and assign elements
  37. 	// ... in the array through the indexer.
  38. 	Layout layout = new Layout();
  39. 	layout[1] = "Frank Gehry";
  40. 	layout[3] = "I. M. Pei";
  41. 	layout[10] = "Frank Lloyd Wright";
  42. 	layout[11] = "Apollodorus";
  43. 	layout[-1] = "Error";
  44. 	layout[1000] = "Error";
  45.  
  46. 	// Read elements through the indexer.
  47. 	string value1 = layout[1];
  48. 	string value2 = layout[3];
  49. 	string value3 = layout[10];
  50. 	string value4 = layout[11];
  51. 	string value5 = layout[50];
  52. 	string value6 = layout[-1];
  53.  
  54. 	// Write the results.
  55. 	Console.WriteLine(value1);
  56. 	Console.WriteLine(value2);
  57. 	Console.WriteLine(value3);
  58. 	Console.WriteLine(value4);
  59. 	Console.WriteLine(value5); // Is null
  60. 	Console.WriteLine(value6);
  61.     }
  62. }
Success #stdin #stdout 0.02s 33896KB
comments (?)
stdin
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Standard input is empty
stdout
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Frank Gehry
I. M. Pei
Frank Lloyd Wright
Apollodorus

Error
https://ideone.com/fzgCY2
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
secret

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