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Although the preceding examples have demonstrated the basic mechanism of indexers and properties, they haven t displayed their full power To conclude this chapter, a class called RangeArray is developed that uses indexers and properties to create an array type in which the index range of the array is determined by the programmer As you know, in C# all arrays begin indexing at zero However, some applications would benefit from an array that allows indexes to begin at any arbitrary point For example, in some situations it might be more convenient for an array to begin indexing with 1 In another situation, it might be beneficial to allow negative indexes, such as an array that runs from 5 to 5 The RangeArray class developed here allows these and other types of indexing Using RangeArray, you can write code like this:

RangeArray ra = new RangeArray(-5, 10); // array with indexes from -5 to 10 for(int i=-5; i <= 10; i++) ra[i] = i; // index from -5 to 10

As you can guess, the first line constructs a RangeArray that runs from 5 to 10, inclusive The first argument specifies the beginning index The second argument specifies the ending index Once ra has been constructed, it can be indexed from 5 to 10 The entire RangeArray class is shown here, along with RangeArrayDemo, which demonstrates the array As implemented here, RangeArray supports arrays of int, but you can change the data type, if desired

/* Create a specifiable range array class The RangeArray class allows indexing to begin at some value other than 0 When you create a RangeArray, you specify the beginning and ending index Negative indexes are also allowed For example, you can create arrays that index from -5 to 5, 1 to 10, or 50 to 56 */ using System; class RangeArray { // Private data int[] a; // reference to underlying array

( ex cos 2x + x 3 4x) dx = F ( 2) F ( 1) 24 1 sin( 2 2) + 2 22 2 4 14 1 sin( 2 1) + 2 12 2 4

10:

// An auto-implemented, read-only Length property public int Length { get; private set; } // An auto-implemented, read-only Error property public bool Error { get; private set; } // Construct array given its size public RangeArray(int low, int high) { high++; if(high <= low) { ConsoleWriteLine("Invalid Indices"); high = 1; // create a minimal array for safety low = 0; } 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)) { Error = false; return a[index - lowerBound]; } else { Error = true; return 0; } } // This is the set accessor set { if(ok(index)) { a[index - lowerBound] = value; Error = false; } else Error = true; } } // Return true if index is within bounds private bool ok(int index) { if(index >= lowerBound & index <= upperBound) return true; return false; } }

decide to send an E-mail to everyone in the company Consider these two objectives:

Part I:

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C# provides a feature called the anonymous type that directly relates to LINQ As the name implies, an anonymous type is a class that has no name Its primary use is to create an object returned by the select clause Often, the outcome of a query is a sequence of objects that are either a composite of two (or more) data sources (such as in the case of join) or include a subset of the members of one data source In either case, often the type of the object being returned is needed only because of the query and is not used elsewhere in the program In this case, using an anonymous type eliminates the need to declare a class that will be used simply to hold the outcome of the query An anonymous type is created through the use of this general form: new { nameA = valueA, nameB = valueB, } Here, the names specify identifiers that translate into read-only properties that are initialized by the values For example,

new { Count = 10, Max = 100, Min = 0 }