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// Construct array given its size public RangeArray(int low, int high) { high++; if(high <= low) { throw new RangeArrayException("Low index not less than high"); } a = new int[high - low]; Length = high - low; lowerBound = low; upperBound = --high; } // This is the indexer for RangeArray public int this[int index] { // This is the get accessor get { if(ok(index)) { return a[index - lowerBound]; } else { throw new RangeArrayException("Range Error"); } } // This is the set accessor set { if(ok(index)) { a[index - lowerBound] = value; } else throw new RangeArrayException("Range Error"); } } // Return true if index is within bounds private bool ok(int index) { if(index >= lowerBound & index <= upperBound) return true; return false; } } // Demonstrate the index-range array class RangeArrayDemo { static void Main() { try { RangeArray ra = new RangeArray(-5, 5); RangeArray ra2 = new RangeArray(1, 10); // Demonstrate ra ConsoleWriteLine("Length of ra: " + raLength); for(int i = -5; i <= 5; i++) ra[i] = i;
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ConsoleWrite("Contents of ra: "); for(int i = -5; i <= 5; i++) ConsoleWrite(ra[i] + " ");
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ConsoleWriteLine("\n"); // Demonstrate ra2 ConsoleWriteLine("Length of ra2: " + ra2Length); for(int i = 1; i <= 10; i++) ra2[i] = i; ConsoleWrite("Contents of ra2: "); for(int i = 1; i <= 10; i++) ConsoleWrite(ra2[i] + " "); ConsoleWriteLine("\n"); } catch (RangeArrayException exc) { ConsoleWriteLine(exc); } // Now, demonstrate some errors ConsoleWriteLine("Now generate some range errors"); // Use an invalid constructor try { RangeArray ra3 = new RangeArray(100, -10); // Error } catch (RangeArrayException exc) { ConsoleWriteLine(exc); } // Use an invalid index try { RangeArray ra3 = new RangeArray(-2, 2); for(int i = -2; i <= 2; i++) ra3[i] = i; ConsoleWrite("Contents of ra3: "); for(int i = -2; i <= 10; i++) // generate range error ConsoleWrite(ra3[i] + " "); } catch (RangeArrayException exc) { ConsoleWriteLine(exc); } } }
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Length of ra: 11 Contents of ra: -5 -4 -3 -2 -1 0 1 2 3 4 5
Part I:
The C# Language
Length of ra2: 10 Contents of ra2: 1 2 3 4 5 6 7 8 9 10 Now generate some range errors Low index not less than high Contents of ra3: -2 -1 0 1 2 Range Error
When a range error occurs, RangeArray throws an object of type RangeArrayException Notice there are three places in RangeArray that this might occur: in the get indexer accessor, in the set indexer accessor, and by the RangeArray constructor To catch these exceptions implies that RangeArray objects must be constructed and accessed from within a try block, as the program illustrates By using an exception to report errors, RangeArray now acts like one of C# s built-in types and can be fully integrated into a program s exception-handling mechanism Notice that none of the RangeArrayException constructors provide any statements in their body Instead, they simply pass their arguments along to Exception via base As explained, in cases in which your exception class does not add any functionality, you can simply let the Exception constructors handle the process There is no requirement that your derived class add anything to what is inherited from Exception Before moving on, you might want to experiment with this program a bit For example, try commenting-out the override of ToString( ) and observe the results Also, try creating an exception using the default constructor, and observe what C# generates as its default message
Catching Derived Class Exceptions
You need to be careful how you order catch clauses when trying to catch exception types that involve base and derived classes, because a catch for a base class will also match any of its derived classes For example, because the base class of all exceptions is Exception, catching Exception catches all possible exceptions Of course, using catch without an exception type provides a cleaner way to catch all exceptions, as described earlier However, the issue of catching derived class exceptions is very important in other contexts, especially when you create exceptions of your own If you want to catch exceptions of both a base class type and a derived class type, put the derived class first in the catch sequence This is necessary because a base class catch will also catch all derived classes Fortunately, this rule is self-enforcing because putting the base class first causes a compile-time error The following program creates two exception classes called ExceptA and ExceptB ExceptA is derived from Exception ExceptB is derived from ExceptA The program then throws an exception of each type For brevity, the custom exceptions supply only one constructor (which takes a string that describes the exception) But remember, in commercial code, your custom exception classes will normally provide all four of the constructors defined by Exception
// Derived exceptions must appear before base class exceptions using System; // Create an exception class ExceptA : Exception { public ExceptA(string str) : base(str) { }
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