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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] + " ");

The first time you work with InfoView, you need to modify several options to ensure that you display and build reports in the desired format To modify your default settings, select the Preferences button from top-right corner of the Header panel Some of the tabs that appear here will depend also on what interfaces your company has licensed

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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The output from the program is shown here:

Within the General page of the InfoView preferences, you set the defaults for your starting page, behavior when you open and close a document, how the list of documents appears, and so on

Length of ra: 11 Contents of ra: -5 -4 -3 -2 -1 0 1 2 3 4 5

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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

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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

You set your initial InfoView display by choosing from Home Displays the default screen as shown in Figure 17-1