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PS (8) > $s.size 8 PS (9) > $s.length 8
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Both the size and length members return the value 8. Adding NoteProperty members Now let s add a note property. A note property is simply a way of attaching a new piece of data (a note) to an existing object, rather like putting a sticky note on your monitor. Again we ll use the same string in $s. Let s add a note property called description. In this example, since we know that $s is already wrapped in a PSObject, we don t need to use -passthru and do the assignment we simply add the property to the existing object.
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PS (10) > add-member -in $s noteproperty description "A string" PS (11) > $s.description A string
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We see that we ve added a description property to the object with the value A string . And, to prove that this property isn t present on all strings, we do
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PS (12) > "Hi there".description PS (13) >
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and see that the property returned nothing. Of course, the note property is a settable property, so we can change it with an assignment like any other settable property.
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PS (14) > $s.description = "A greeting" PS (15) > $s.description A greeting
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In this example, we changed the value in the note property to A greeting . Note properties allow you to attach arbitrary data to an object. They aren t type constrained, so they can hold any type. Let s set the description property to a [datetime] object:
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PS (16) > $s.description = get-date PS (17) > $s.description Sunday, May 28, 2006 4:24:50 PM
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But the value stored in the object is still a [datetime] object, not a string. As such, we can get the dayofweek property out of the description property.
PS (18) > $s.description.dayofweek Sunday PS (19) > $s.description.gettype().fullname System.DateTime
Adding ScriptMethod members Both of the synthetic members we ve added so far have been pure data properties; no code was involved. Now we ll look at adding members that execute code. We ll start with ScriptMethods, since they re easiest. Let s add a method that returns the string that it s associated with, reversed. First let s find an easy way to reverse a string. If we examine [string], we ll see that there is (unfortunately) no reverse method on the string class. There is, however, a static reverse method on [array] that we can use.
PS (1) > [array] | gm -static reverse TypeName: System.Array Name MemberType Definition ------------- ---------Reverse Method static System.Void Reverse(Array array), s...
This method takes an array and, since it s void, it must obviously reverse the array in place. This tells us two things: we need to turn the string into an array (of characters)
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and then save it in a variable so it can be reversed in place. Converting the string to an array of characters is simple we can just use a cast.
PS (19) > $s Hi there PS (20) > $a = [char[]] $s
Casting a string into the type [char[]] (array of characters) produces a new object that is the array of individual characters in the original string; and just to verify this:
PS (21) > $a.gettype().fullname System.Char[] PS (22) > "$a" H i t h e r e
We see that the type of the new object is [char[]] and it does contain the expected characters. Now let s reverse it using the [array]::reverse() static method.
PS (23) > [array]::reverse($a) PS (24) > "$a" e r e h t i H
When we look at the contents of the array, we see that it has been reversed. But it s still an array of characters. The final step is to turn this back into a string. We could simply cast it or use string interpolation (expansion), but that means that we have to set $OFS to get rid of the extra spaces this would introduce (see chapter 3 for an explanation of this). Instead, we re going to use the static join() method available on the string class.
PS (25) > $ns = [string]::join("", $a) PS (26) > $ns ereht iH PS (27) > $ns.gettype().fullname System.String
At this point we have the reversed string in $ns. But the goal of this effort was to attach this as a method to the string object itself. To do so, we need to construct a scriptblock to use as the body of the ScriptMethod. This definition looks like:
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