Convert errflag into a property

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

// Convert errflag into a property. 
 
using System; 
 
class FailSoftArray {  
  int[] a; // reference to underlying array  
  int len; // length of array 
 
  bool errflag; // now private 
   
  // Construct array given its size.  
  public FailSoftArray(int size) { 
    a = new int[size]; 
    len = size;  
  } 
 
  // Read-only Length property. 
  public int Length { 
    get { 
      return len; 
    } 
  } 
 
  // Read-only Error property. 
  public bool Error { 
    get { 
      return errflag; 
    } 
  } 
 
  // This is the indexer for FailSoftArray. 
  public int this[int index] { 
    // This is the get accessor. 
    get { 
      if(ok(index)) { 
        errflag = false; 
        return a[index]; 
      } else { 
        errflag = true; 
        return 0; 
      } 
    } 
 
    // This is the set accessor 
    set { 
      if(ok(index)) { 
        a[index] = value; 
        errflag = false; 
      } 
      else errflag = true; 
    } 
  } 
 
  // Return true if index is within bounds. 
  private bool ok(int index) { 
   if(index >= 0 & index < Length) return true; 
   return false; 
  } 
}  
  
// Demonstrate the improved fail-soft array. 
public class FinalFSDemo {  
  public static void Main() {  
    FailSoftArray fs = new FailSoftArray(5); 
 
    // use Error property 
    for(int i=0; i < fs.Length + 1; i++) { 
      fs[i] = i*10; 
      if(fs.Error)  
        Console.WriteLine("Error with index " + i); 
    } 
 
  } 
}

1.	Override Properties
2.	enum based attribute
3.	A simple property example
4.	Add Length property to FailSoftArray
5.	Error handling in property setter validating
6.	Use properties to set and get private members
7.	Define properties for class
8.	Demonstrates the use of properties to control how values are saved in fields
9.	Illustrates the use of a property
10.	The use of an abstract property
11.	access to a private field through a property
12.	Properties: Use of Properties
13.	Properties: Side Effects When Setting Values
14.	Properties Accessors
15.	Delegates as Static Properties
16.	Properties:Static Properties
17.	Properties:Virtual Properties

Convert errflag into a property : Properties « Class Interface « C# / C Sharp

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