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Creating a hash of hashes is similar to creating a list of lists, differing only in our use of syntax. Here is an example of a three-deep nested hash of hashes: %identities = ( JohnSmith => { Name => { First=>"John", Last=>"Smith" }, Phone => { Home=>"123 4567890", Work=>undef }, Address => { Street => "13 Acacia Avenue", City => "Arcadia City", Country => "El Dorado", } }, AlanSmithee => { Name => { First=>"Alan", Last=>"Smithee" }, Phone => { Work=>"not applicable" }, } ); Accessing this structure is similar too, and again Perl allows us to omit the dereferencing operator for consecutive hash keys. $alans_first_name = $identities{'AlanSmithee'}{'Name'}{'First'}; Since nesting data structures is just a case of storing references, we can also create lists of hashes, hashes of lists, and anything in between. #!/usr/bin/perl # lists.pl use warnings; use strict; my (@list_of_hashes, %hash_of_lists, %mixed_bag, $my_object); my @my_list = (1,2,3,4,5); @list_of_hashes = ( { Monday=>1, Tuesday=>2, Wednesday=>3, Thursday=>4, Friday=>5 }, { Red=>0xff0000, Green=>0x00ff00, Blue=>0x0000ff }, ); print "Tuesday is the $list_of_hashes[0]{Tuesday}nd day of the week.", "\n"; %hash_of_lists = ( List_1 => [1, 2, 3], List_2 => ["Red", "Yellow", "Blue"], );

If true, it prevents the value for this column from being changed in edit mode. No edit control will be provided. Primary key fields are often read-only. If true, it prevents the value for this column from being set in insert mode. If you want a column value to be set programmatically or based on a default value defined in the database, you can use this feature. If false, the column won t be visible in the page (and no HTML will be rendered for it). This gives you a convenient way to programmatically hide or show specific columns, changing the overall view of the data. Sorts your results based on one or more columns. You ll learn about sorting later in the Sorting and Paging the GridView section of this chapter. If true (the default), all text will be HTML encoded to prevent special characters from mangling the page. You could disable HTML encoding if you want to embed a working HTML tag (such as a hyperlink), but this approach isn t safe. It s always a better idea to use HTML encoding on all values and provide other functionality by reacting to GridView selection events. Displays the text that will be shown for a null value. The default is an empty string, although you could change this to a hard-coded value, such as (not specified). If true, converts all empty strings to null values (and uses the NullDisplayText to display them). Configures the appearance for just this column, overriding the styles for the row. You ll learn more about styles throughout this chapter.

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because CustomerID is the primary key of the Customers table. LINQ will deduce whatever it can about a column, but you need to tell it explicitly that a column is part of a primary key.

print "The second element of List_1 is: $hash_of_lists{List_1}[1]", "\n"; %mixed_bag = ( Scalar1 => 3, Scalar2 => "Hello World", List1 => [1, 2, 3], Hash1 => { A => 'Horses', C => 'Miles' }, List2 => ['Hugh','Pugh', ['Barley-McGrew','Cuthbert'], 'Dibble', 'Grubb'], Scalar3 => $my_object, Hash2 => { Time => [ gmtime ], Date => scalar(gmtime), }, List3 => @my_list[0..2], ); print $mixed_bag{List2}[2][1]; # produces 'Cuthbert'

As you ve already learned, you can create a GridView that shows all your fields by setting the AutoGenerateColumns property to true. Unfortunately, when you use this approach you lose the ability to control any of the details over your columns, including their order, formatting, sorting, and so on. To configure these details, you need to set AutoGenerateColumns to false and define your columns explicitly. This requires more work, and it s a bit tedious. However, there is a nifty trick that solves this problem. You can use explicit columns but get Visual Studio to create the column tags for you automatically. Here s how it works: select the GridView control, and click Refresh Schema in the smart tag. At this point, Visual Studio will retrieve the basic schema information from your data source (for example, the names and data type of each column) and then add one <BoundField> element for each field.

Manipulating nested data structures is essentially no different to manipulating simple ones; we just have to be sure to modify the correct thing in the right way For example, to add a new row to our two-dimensional array, we can either define the row explicitly, or use the push function to add it In either case we have to be sure to add a reference, not the list itself, or we will end up adding the list contents to the outer array instead.

Tip If you modify the data source so it returns a different set of columns, you can regenerate the GridView

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