barcode vb.net source code System.Array methods and properties Method or property in Visual C#

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Table 10-1. System.Array methods and properties Method or property
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BinarySearch( ) Clear( ) Copy( )
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Purpose Overloaded public static method that searches a one-dimensional sorted array Public static method that sets a range of elements in the array either to zero or to a null reference, depending on the element type Overloaded public static method that copies a section of one array to another array
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Array Methods |
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Table 10-1. System.Array methods and properties (continued) Method or property
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CreateInstance( ) IndexOf( ) LastIndexOf( ) Reverse( ) Sort( ) Length
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Purpose Overloaded public static method that instantiates a new instance of an array Overloaded public static method that returns the index (offset) of the first instance of a value in a one-dimensional array Overloaded public static method that returns the index of the last instance of a value in a one-dimensional array Overloaded public static method that reverses the order of the elements in a onedimensional array Overloaded public static method that sorts the values in a one-dimensional array Public property that returns the length of the array
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Sorting Arrays
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Two useful static methods from Table 10-1 that deserve a closer look are Sort( ) and Reverse( ). These methods do what you think they would: Reverse( ) reverses the order of elements in the array, and Sort( ) sorts the elements in order. These two methods are fully supported for arrays of the built-in C# types, such as string, so sorting an array of strings puts the elements in alphabetical order, and sorting an array of ints puts them in numeric order. Making the Sort( ) method work with your own classes is a bit trickier, because you must implement the IComparable interface (see 13 for more on interfaces). Example 10-8 demonstrates the use of these two methods to manipulate String objects.
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using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace Example_10_8_ _ _ _Sorting_and_Reversing_Arrays { public class Tester { public static void PrintMyArray(string[] theArray) { foreach (string str in theArray) { Console.WriteLine("Value: {0}", str); } Console.WriteLine("\n"); } static void Main( )
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10: Arrays
{ String[] myArray = { "Proust", "Faulkner", "Mann", "Hugo" }; PrintMyArray(myArray); Array.Reverse(myArray); PrintMyArray(myArray); String[] myOtherArray = { "We", "Hold", "These", "Truths", "To", "Be", "Self", "Evident", }; PrintMyArray(myOtherArray); Array.Sort(myOtherArray); PrintMyArray(myOtherArray); } } }
The output looks like this:
Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Value: Proust Faulkner Mann Hugo Hugo Mann Faulkner Proust We Hold These Truths To Be Self Evident Be Evident Hold Self These To
Sorting Arrays |
Value: Truths Value: We
The example begins by creating myArray, an array of strings with the words:
"Proust", "Faulkner", "Mann", "Hugo"
This array is printed, and then passed to the Array.Reverse( ) method, where it is printed again to see that the array itself has been reversed:
Value: Value: Value: Value: Hugo Mann Faulkner Proust
Similarly, the example creates a second array, myOtherArray, containing the words:
"We", "Hold", "These", "Truths", "To", "Be", "Self", "Evident",
This is passed to the Array.Sort( ) method. Then Array.Sort( ) happily sorts them alphabetically:
Value: Value: Value: Value: Value: Value: Value: Value: Be Evident Hold Self These To Truths We
Array.Sort( ) and Array.Reverse( ) are static methods, meaning you
call them on the class, not the object, as we discussed in 7. That means you don t call myArray.Reverse( ) to reverse the elements; instead, you call the static method and pass in the array as an argument, like this:
Array.Reverse(myArray);
Summary
An array is an indexed collection of objects, all of the same type. You declare an array by giving the type of objects the array contains, followed by the square bracket operator ([]), followed by the name of the array. You then instantiate the array with the new keyword and the number of elements the array will contain. The index of the first element in the array is always zero, and the index of the last element in the array is always Length-1. You can use a for loop to iterate through the array, by using the loop s counter as the index to the array.
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