How Many Elements Are There i n the Array in VS .NET

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How Many Elements Are There i n the Array
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There are a number of ways to determine the number of array elements, but the easiest and most efficient way is to use the length property of the array object The length property of the array object contains the number of elements in the array Here's how to access the length property of the CustomerNames array that we declared in the previous section of this chapter:
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Dim len AS Integer
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CustomerNameslength
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You specify the name of the array object and the name of the property (length) separated by a dot to access the length property In this example, the length of the array is assigned to the variable len
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You don't have to assign the length property to a variable Simply use the length property where you need to use the length of the array in an expression Remember that the length of an array is the actual number of array elements and not the index of the last array element Take a look at the following array The length of this array is four elements Rookies tend to assume that the value of the length property is 3 because the last element in the array has an index of 3 This is a mistake; the length property is 4, since there are four elements in the array
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CustomerNames[O] CustomerNames [ l] CustomerNames [2] CustomerNames [3]
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llMaryll John" l1Mikel1 llTomll
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The array class contains a number of methods that you'll find very useful when building your ASPNET application We'll explore many of these in this section of the chapter
Sorting Array Elements
Sorting elements of an array is probably one of the more common tasks that you'll be required to perform Fortunately, you don't have to reorder elements yourself, because there is a method to do this for you called the Sort() method The Sort() method rearranges values assigned to elements of an array in sort order, which is alphabetical order for characters and numerical order for numbers Suppose you have the array called products shown in the next table, which is an unsorted array, and you need to have it placed in sort order
Products
Soda
Water pizza Beer
Here's how to sort the products array The third line calls the Sort() method to place the array in alphabetical order Try replacing the code in the button event
A rrays
(see the earlier section "Array Elements") with this code, and you'll see that the list of products is displayed in alphabetical order
Dim i As Integer Dim products ( ) As String = {llSodall, I1Waterl1, llPizzall, I1Beerl1} Array Sort (products) For i = 0 To 3 Response Write (products (i)) Next
Reversing the Order of Array Elements
Array elements can be reversed by calling the Reverse() method, which reverses the order in which values appear in the array Let's say that you want to reverse the order of the previously sorted array You do this by calling the Reverse() method, as shown in the following code Try this in your button event:
Dim i As Integer Dim products ( ) As String = {llSodall, I1Waterl1, llPizzalll I1Beerl1) Array Sort (products) Array Reverse (products) For i = 0 To 3 Response Write (products (i)) Next
Searching Array Elements
Searching an array for a specific value is another common task that your application will need to perform You could use a loop to step through each element of the array until you found one that matches the search criteria, but this is the hard way to search There are two easier and faster ways to do this by using methods of the Array class One of these methods is Indexof() The Indexof() method requires two pieces of information in order to perform the search These are the name of the array that is being searched and the search criterion If the search criterion matches the value of an element of the array, then the Indexof() method returns the index of the matching element A negative number is returned if none of the values of the elements match the criterion
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