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п»ї7.14 Sort a Hashtable by Key or Value.
You have a hashtable of keys and values, and you want to get the list of values that result from sorting the keys in order.
Solution.
To sort a hashtable, use the GetEnumerator() method on the hashtable to access its individual elements. Then use the Sort-Object cmdlet to sort by Name or Value :
foreach ( $item in $myHashtable . GetEnumerator () | Sort-Object Name ) $item . Value >
If you control the definition of the hashtable, use the [Ordered] type cast while defining the hashtable to have it retain the order supplied in the definition.
$orderedHashtable = [Ordered] @ Item1 = "Hello" ; Item2 = "World" >
Discussion.
Since the primary focus of a hashtable is to simply map keys to values, it doesn’t usually retain any ordering whatsoever—such as the order you added the items, the sorted order of the keys, or the sorted order of the values. This becomes clear in Example 7-3.
Example 7-3. A demonstration of hashtable items not retaining their order.
PS > $myHashtable = @<> PS > $myHashtable["Hello"] = 3 PS > $myHashtable["Ali"] = 2 PS > $myHashtable["Alien"] = 4 PS > $myHashtable["Duck"] = 1 PS > $myHashtable["Hectic"] = 11 PS > $myHashtable Name Value ---- ----- Hectic 11 Duck 1 Alien 4 Hello 3 Ali 2.
However, the hashtable object supports a GetEnumerator() method that lets you deal with the individual hashtable entries—all of which have a Name and Value property. Once you have those, we can sort by them as easily as we can sort any other PowerShell data. Example 7-4 demonstrates this technique.
Example 7-4. Sorting a hashtable by name and value.
PS > $myHashtable.GetEnumerator() | Sort-Object Name Name Value ---- ----- Ali 2 Alien 4 Duck 1 Hectic 11 Hello 3 PS > $myHashtable.GetEnumerator() | Sort-Object Value Name Value ---- ----- Duck 1 Ali 2 Hello 3 Alien 4 Hectic 11.
By using the [Ordered] type cast, you can create a hashtable that retains the order in which you define and add items:
PS > $myHashtable = [Ordered] @ PS > $myHashtable["Hello"] = 3 PS > $myHashtable Name Value ---- ----- Duck 1 Ali 2 Hectic 11 Alien 4 Hello 3.
For more information about working with hashtables, see “Hashtables (Associative Arrays)”.
See Also.
“Hashtables (Associative Arrays)”
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