<# .SYNOPSIS A rich example of using hash tables with PowerShell .DESCRIPTION This script creates, populates a hash table then operates on the hash table .NOTES File Name : Get-HashTable2.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 .LINK http://pshscripts.blogspot.co.uk/2008/07/get-hashtable2ps1_22.html http://msdn.microsoft.com/en-gb/netframework/aa663309.aspx .EXAMPLE PS c:\foo> Get-HashTable2.ps1 The Hash Table so far Name Value ---- ----- bmp paint.exe rtf wordpad.exe txt notepad.exe dib paint.exe Trying to add an entry with an existing key *** *** An element with Key = "txt" already exists. *** Continuing for key = "rtf", value = wordpad.exe. for key = "rtf", value = winword.exe. The Hash Table so far doc winword.exe bmp paint.exe rtf winword.exe txt notepad.exe dib paint.exe Value added for key = "ht": hypertrm.exe 6 elements in the hash table as follows: doc winword.exe bmp paint.exe ht hypertrm.exe rtf winword.exe txt notepad.exe dib paint.exe Value Entries: Value = winword.exe Value = paint.exe Value = hypertrm.exe Value = winword.exe Value = notepad.exe Value = paint.exe Key Entries Key = doc Key = bmp Key = ht Key = rtf Key = txt Key = dib Removing("doc") Key "doc" is no longer found. #> ### # Start of script ## # create new hash table $openWith = @{} # Add some elements to the hash table. There are no # duplicate keys, but some of the values are duplicates. $openWith.Add('txt', 'notepad.exe') $openWith.Add('dib', 'paint.exe') # Add in a powershell way! $openwith += @{'bmp'='paint.exe'} # or $wordpad = 'wordpad.exe' $openwith += @{'rtf'=$wordpad} # Display the Hash table 'The Hash Table so far' $openwith # The Add method throws an exception if the new key is # already in the hash table. #first catch exception trap [Exception] { '***' write-host "*** An element with Key = `"txt`" already exists." '***' continue } # now the offending line. '';'Trying to add an entry with an existing key' $openWith.Add('txt', 'winword.exe'); 'Continuing';'' # The Item property is the default property, so you # can omit its name when accessing elements # A non-existing key comes up empty "For key = `"rtf`", value = {0}." -f $openWith['rtf'] # The default Item property can be used to change the value # associated with a key. # add an entry for RTF $openWith['rtf'] = 'winword.exe'; "For key = `"rtf`", value = {0}." -f $openWith['rtf'] # If a key does not exist, setting the default Item property # for that key adds a new key/value pair. $openWith['doc'] = 'winword.exe' # Note Progress with this hashtable '';'The Hash Table so far' $openwith '' # The ContainsKey method can be used to test keys before inserting them. # tesst the "ht" key before adding it into the hashtable if (!$openWith.ContainsKey('ht')) { $openWith.Add('ht', 'hypertrm.exe') "Value added for key = `"ht`": {0}" -f $openWith['ht'] } # When you use foreach to enumerate hash table elements, # the elements are retrieved as KeyValuePair objects. '' '{0} elements in the hash table as follows:' -f $openwith.count $openwith # To get the values alone, use the Values property. $valueColl = $openWith.Values # To get the values alone, use the Values property. $valueColl = $openWith.Values # The elements of the ValueCollection are strongly typed #with the type that was specified for hash table values. '';'Value Entries:' foreach( $s in $valueColl ) { 'Value = {0}' -f $s } # To get the keys alone, use the Keys property. $keyColl = $openWith.Keys # The elements of the KeyCollection are strongly typed # with the type that was specified for hash table keys. '';'Key Entries' foreach( $s in $keyColl ){ 'Key = {0}' -f $s } # Use the Remove method to remove a key/value pair. "`nRemoving(`"doc`")" $openWith.Remove('doc') # See if it's there if (!$openWith.ContainsKey('doc')) { "Key `"doc`" is no longer found." } # End of script
Showing posts with label system.collections.hashtable. Show all posts
Showing posts with label system.collections.hashtable. Show all posts
Tuesday, 22 July 2008
Get-HashTable2.ps1
Monday, 21 July 2008
Get-HashTable.ps1
<# .SYNOPSIS Sample using Hashtables .DESCRIPTION This script creates, populates and displays a hash table .NOTES File Name : Get-HashTable.ps1 Author : Thomas Lee - tfl@psp.co.ukequires : PowerShell V2 CTP3 .LINK http://www.pshscripts.blogspot.com .EXAMPLE PS C:\foo> Get-HashTable.ps1 The Hashtable contains the following: Name Value ---- ----- four fox two quick three brown one The #> $myht = new-object system.collections.hashtable $myht.Add( "one", "The" ) $myht.Add( "two", "quick" ) # or doing it the PowerShell way $myht += @{"three" = "brown" } $myht += @{"four" = "fox"} # Display the Hashtable. "The Hashtable contains the following:" $myht
Saturday, 19 July 2008
Synch-HashTable.ps1
<# .SYNOPSIS Demonstrates Hashtable IsSynchronized .DESCRIPTION This script creates and populates a hash table, then checks on and displays sync status. .NOTES File Name : Sync-HashTable.ps1A Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 .LINK http://pshscripts.blogspot.co.uk/2008/07/synch-hashtableps1.html .EXAMPLE PS c:\foo> Sync-HashTable.ps1 $myht is synchronised : False $mySyncdht is synchronised : True #> ## # Start of script ## # Create and initialise a new Hashtable $myht = new-object system.collections.hashtable $myht.Add( 0, "zero") $myht.Add( 1, "one") $myht.Add( 2, "two") $myht.Add( 3, "three") # or $myht += @{"4"="four"} # Create a synchronized wrapper around the Hashtable. $mysyncdht = [system.collections.Hashtable]::Synchronized( $myht) # Display the sychronization status of both Hashtables "`$myht is synchronised : {0}" -f $myht.IsSynchronized "`$mySyncdht is synchronised : {0}" -f $mysyncdht.IsSynchronized # End of script
Thursday, 17 July 2008
Show-HashTableValues.ps1
<# .SYNOPSIS Shows use of Hash tables with PowerSHell .DESCRIPTION This script creates and populates a Hash Table then displays the values, keys, etc. .NOTES File Name : Show-HashtableValues.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 .LINK http://pshscripts.blogspot.co.uk/2008/07/show-hashtablevaluesps1.html .EXAMPLE PSH [C:\foo]: .\show-hashtablevalues.ps1 The Hash Table so far Name Value ---- ----- bmp paint.exe rtf wordpad.exe txt notepad.exe dib paint.exe 4 Keys in this table as follows: 1: bmp 2: rtf 3: txt 4: dib 4 Values in this table as follows: 1: paint.exe 2: wordpad.exe 3: notepad.exe 4: paint.exe #> ## # Start of Script ## # Create new hash table $openWith = new-object system.collections.hashtable # Add some elements to the hash table. $openWith.Add('txt', 'notepad.exe') $openWith.Add('dib', 'paint.exe') # Add more entries in a more Powershell way! $openwith += @{'bmp'='paint.exe'} # or $wordpad = 'wordpad.exe' $openwith += @{'rtf'=$wordpad} # Display the Hash table 'The Hash Table so far' $openwith '' # To get the keys alone, use the Keys property $i=0 '{0} Keys in this table as follows:' -f $openwith.keys.count $openwith.keys | %{'{0}: {1}' -f ++$i, $_} '' # To get the values alone, use the Values property $i=0 '{0} Values in this table as follows:' -f $openwith.values.count $openwith.values | %{'{0}: {1}' -f ++$i, $_} '' # End of Script
Show-HashTableProperties.ps1
<# .SYNOPSIS Shows details of a hash table .DESCRIPTION This script creates, populates then displays a hash table. It then displays table properties, keys, values and does a synchroot. .NOTES File Name : Show-HashTableProperties.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 .LINK http://www.pshscripts.blogspot.com .EXAMPLE PS c:\foo> .\Show-HashTableProperties.ps1 There are 4 in the $openwith hash table as follows: Name Value ---- ----- bmp paint.exe rtf wordpad.exe txt notepad.exe dib paint.exe Count of items in the hashtable : 4 Is hashtable fixed size? : False Is hashtable read-only? : False Is hashtabale synchronised? : False Keys in hashtable: bmp rtf txt dib Values in hashtable paint.exe wordpad.exe notepad.exe paint.exe $sr = System.Object #> ## # Start of Script ## # Create new hash table $openWith = @{} # Add some elements to the hash table. $openWith.Add("txt", "notepad.exe") $openWith.Add("dib", "paint.exe") # Add in a powershell way! $openwith += @{"bmp"="paint.exe"} # or $wordpad = "wordpad.exe" $openwith += @{"rtf"=$wordpad} # Display hash table "There are {0} in the `$openwith hash table as follows:" -f $openwith.count $openwith "" # Display Properties "Count of items in the hashtable : {0}" -f $openwith.Count "Is hashtable fixed size? : {0}" -f $openwith.IsFixedSize "Is hashtable read-only? : {0}" -f $openwith.IsReadonly "Is hashtabale synchronised? : {0}" -f $openwith.IsSynchronized "";"Keys in hashtable:" $openwith.keys "";"Values in hashtable" $openwith.values "" # finally get syncroot (not much there!) $sr = $openwith.syncroot "`$sr = {0}" -f $sr
Wednesday, 16 July 2008
Get-Hashtable2.ps1
<# .SYNOPSIS A rich example of using hash tables with PowerShell .DESCRIPTION This script creates, populates a hash table then operates on the hash table .NOTES File Name : Get-HashTable2.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 CTP3 .LINK http://www.pshscripts.blogspot.com http://msdn.microsoft.com/en-gb/netframework/aa663309.aspx .EXAMPLE PS c:\foo> Get-HashTable2.ps1 The Hash Table so far Name Value ---- ----- bmp paint.exe rtf wordpad.exe txt notepad.exe dib paint.exe Trying to add an entry with an existing key *** *** An element with Key = "txt" already exists. *** Continuing for key = "rtf", value = wordpad.exe. for key = "rtf", value = winword.exe. The Hash Table so far doc winword.exe bmp paint.exe rtf winword.exe txt notepad.exe dib paint.exe Value added for key = "ht": hypertrm.exe 6 elements in the hash table as follows: doc winword.exe bmp paint.exe ht hypertrm.exe rtf winword.exe txt notepad.exe dib paint.exe Value Entries: Value = winword.exe Value = paint.exe Value = hypertrm.exe Value = winword.exe Value = notepad.exe Value = paint.exe Key Entries Key = doc Key = bmp Key = ht Key = rtf Key = txt Key = dib Removing("doc") Key "doc" is no longer found. #> ### # Start of script ## # create new hash table $openWith = @{} # Add some elements to the hash table. There are no # duplicate keys, but some of the values are duplicates. $openWith.Add('txt', 'notepad.exe') $openWith.Add('dib', 'paint.exe') # Add in a powershell way! $openwith += @{'bmp'='paint.exe'} # or $wordpad = 'wordpad.exe' $openwith += @{'rtf'=$wordpad} # Display the Hash table 'The Hash Table so far' $openwith # The Add method throws an exception if the new key is # already in the hash table. #first catch exception trap [Exception] { '***' write-host "*** An element with Key = `"txt`" already exists." '***' continue } # now the offending line. '';'Trying to add an entry with an existing key' $openWith.Add('txt', 'winword.exe'); 'Continuing';'' # The Item property is the default property, so you # can omit its name when accessing elements # A non-existing key comes up empty "For key = `"rtf`", value = {0}." -f $openWith['rtf'] # The default Item property can be used to change the value # associated with a key. # add an entry for RTF $openWith['rtf'] = 'winword.exe'; "For key = `"rtf`", value = {0}." -f $openWith['rtf'] # If a key does not exist, setting the default Item property # for that key adds a new key/value pair. $openWith['doc'] = 'winword.exe' # Note Progress with this hashtable '';'The Hash Table so far' $openwith '' # The ContainsKey method can be used to test keys before inserting them. # tesst the "ht" key before adding it into the hashtable if (!$openWith.ContainsKey('ht')) { $openWith.Add('ht', 'hypertrm.exe') "Value added for key = `"ht`": {0}" -f $openWith['ht'] } # When you use foreach to enumerate hash table elements, # the elements are retrieved as KeyValuePair objects. '' '{0} elements in the hash table as follows:' -f $openwith.count $openwith # To get the values alone, use the Values property. $valueColl = $openWith.Values # To get the values alone, use the Values property. $valueColl = $openWith.Values # The elements of the ValueCollection are strongly typed #with the type that was specified for hash table values. '';'Value Entries:' foreach( $s in $valueColl ) { 'Value = {0}' -f $s } # To get the keys alone, use the Keys property. $keyColl = $openWith.Keys # The elements of the KeyCollection are strongly typed # with the type that was specified for hash table keys. '';'Key Entries' foreach( $s in $keyColl ){ 'Key = {0}' -f $s } # Use the Remove method to remove a key/value pair. "`nRemoving(`"doc`")" $openWith.Remove('doc') # See if it's there if (!$openWith.ContainsKey('doc')) { "Key `"doc`" is no longer found." } # End of script
Tuesday, 15 July 2008
Count-Hashtable.ps1
<# .SYNOPSIS This script displays the count of items in a hash table. .DESCRIPTION This script creates a hash table then prints out the number of items in the table. .NOTES File Name : Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell Version 2.0 Tested : PowerShell Version 5 .LINK This script posted to: http://pshscripts.blogspot.co.uk/2008/07/count-hashtableps1.html .EXAMPLE PS c:\foo > .\count-hashtable.ps1 There are 4 elements in $myht as follows: Name Value ---- ----- four fox one The three brown two quick #> # Create hashtable and add four elements $myht = new-object system.collections.hashtable $myht.Add( "one", "The" ) $myht.Add( "two", "quick" ) # or doing it the PowerShell way $myht += @{"three" = "brown" } $myht += @{"four" = "fox"} # Display the Hashtable "There are {0} elements in `$myht as follows:" -f $myht.count $myht
Monday, 14 July 2008
Contains-Hashtable.ps1
<# .SYNOPSIS Hashtable Contains method sample using PowerShell .DESCRIPTION This script create and populates a hash table then demonstrates use of contains, containskey and containsvalue methods. .NOTES File Name : Contains-HashTable.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 CTP3 .LINK http://pshscripts.blogspot.co.uk/2008/07/contains-hashtableps1.html .EXAMPLE PS c:\foo> .\Contains-HashTable.ps1 The Hashtable contains the following values: Name Value ---- ----- 4 four 0 zero 2 two 1 one 3 three The key "0" is in the hashtable: True The key "5" is in the hashtable: False The key "2" is in the hashtable: True The key "6" is in the hashtable: False The value "three" is in the hash table: True The value "nine" is in the hash table: False #> ## # Start of script ## $myht = @{} $myht.Add( 0, 'zero' ); $myht.Add( 1, 'one' ); $myht.Add( 2, 'two' ); # or a more powershell way $myht += @{'3'= 'three'} $myht += @{'4'='four' } # Display the values of the Hashtable 'The Hashtable contains the following values:' $myht '' # use contains method $myKey = 0; "The key `"{0}`" is in the hashtable: {1}" -f $myKey, $myHT.Contains( $myKey ) $myKey = 5; "The key `"{0}`" is in the hashtable: {1}" -f $myKey, $myHT.Contains( $myKey ) '' # Now use ContainsKey $myKey = 2; "The key `"{0}`" is in the hashtable: {1}" -f $myKey, $myHT.ContainsKey( $myKey ) $myKey = 6; "The key `"{0}`" is in the hashtable: {1}" -f $myKey, $myHT.ContainsKey( $myKey ) '' # Searches for a specific value using ContainsValue $myValue = 'three'; "The value `"{0}`" is in the hash table: {1}" -f $myValue, $myHT.ContainsValue( $myValue ) $myValue = 'nine'; "The value `"{0}`" is in the hash table: {1}" -f $myValue, $myHT.ContainsValue( $myValue ) # End of script
Clone-Hashtable.ps1
<# .SYNOPSIS Demonstrates the use of the .clone method with hash tables .DESCRIPTION This script creates and populates a hash table, then demosmtrates the use of the .clone() method. .NOTES File Name : Clone-HashTable.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 .LINK http://www.pshscripts.blogspot.com .EXAMPLE PS C:\foo> .\Clone-HashTable.ps1 There are 4 in the $openwith hash table as follows Name Value ---- ----- bmp paint.exe rtf wordpad.exe txt notepad.exe dib paint.exe There are 4 in the $newtable hash table as follows bmp paint.exe rtf wordpad.exe txt notepad.exe dib paint.exe #> ## # start of script ## # create new hash table $openWith = @{} # Add some elements to the hash table. $openWith.Add("txt", "notepad.exe") $openWith.Add("dib", "paint.exe") # Add in a powershell way! $openwith += @{"bmp"="paint.exe"} # or $wordpad = "wordpad.exe" $openwith += @{"rtf"=$wordpad} # display hash table "There are {0} in the `$openwith hash table as follows:" -f $openwith.count $openwith "" # now clone the table $newtable = $openwith.clone() # display new hash table "There are {0} in the `$newtable hash table as follows:" -f $newtable.count $newtable # End of script
Sunday, 13 July 2008
Clear-Hashtable.ps1
<# .SYNOPSIS Demonstrates Hashtable's Clear Method .DESCRIPTION This script creates and populates a hash table then demonstrates use of the .clear method. .NOTES File Name : Clear-HashTable.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 CTP3 .LINK http://www.pshscripts.blogspot.com .EXAMPLE PS C:\foo> .\ClearHashTable.ps1 Initially, Count : 5 Values: Name Value ---- ----- five jumped one The two quick three brown four fox After Clear, Count : 0 Values: #> ## # Start of Script ## # Create and populate a hash table $MyHashTable= @{} $MyHashTable.Add( "one", "The" ) $MyHashTable.Add( "two", "quick" ) $MyHashTable.Add( "three", "brown" ) # Add using the PowerShell way: :-) $MyHashTable += @{"four"="fox" } $myHashTable += @{"five"="jumped"} # Display the count and values of the Hashtable "Initially," " Count : {0}" -f $MyHashTable.Count " Values:" $MyHashTable # Clear the Hashtable. $MyHashTable.Clear() "" # Display the count and values of the Hashtable "After Clear," " Count : {0}" -f $MyHashTable.Count " Values:" $MyHashtable # End of script
Saturday, 12 July 2008
Add-Hashtable.ps1
<# .SYNOPSIS Demonstrates adding items to a hashtable .DESCRIPTION This script creates a Hashtable, then adds some items to it, and finally prints out the resulting hash table. .NOTES File Name : Add-Hashtable.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 .LINK http://www.pshscripts.blogspot.com .EXAMPLE PS c:\foo> .\Add-Hashtable.ps1 The Hashtable contains the following: Name Value ---- ----- four fox two quick three brown one The #> ## # Start of script ## # Create a hash table $MyHashTable = @{} # Add to it using .NET $MyHashTable.Add( 'one', 'The' ) $MyHashTable.Add( 'two', 'quick') # Add the PowerShell Way: $MyHashTable += @{'three' = 'brown'} $MyHashTable += @{'four' = 'fox' } # Display the Hashtable. ' The Hashtable contains the following:' $MyHashTable
Show-QueueProperties.ps1
<# .SYNOPSIS Demonstrates using a queue object .DESCRIPTION This script creates a queue, then adds some items to it, print out the contents then synchs it. .NOTES File Name : show-queueproperties.ps1 Author : Thomas Lee - tfl@psp.co.uk Requires : PowerShell V2 Tags : showqueue,enqueue,synchronize,system.collections.queue .LINK http://www.pshscripts.blogspot.com .EXAMPLE PS c:\foo> .\show-queueproperties.ps1 Creating and populating $myq object with... 3 entries in the queue as follows: entry 0: Hello entry 1: World entry 2: Jerry Garcia Rocks!! Report on $myq $myq is synchronised? :False Synchronising $myq to $sq $sq is synchronised? :True #> ## # Start of script ## # Create new queue object $myq = new-object System.Collections.Queue $myq.Enqueue("Hello") $myq.Enqueue("World") # or a more powershell way $myq += "Jerry Garcia Rocks!!" # Show use of the properties of the Queue # First use count property "Creating and populating `$myq object with..." $i=0 "`{0} entries in the queue as follows:" -f $myq.Count $myq | % {"entry {0}: {1}" -f $i++,$_ } "" # Now check synchronisation "Report on `$myq" "`$myq is synchronised? :{0}" -f $myq.IsSynchronized "" # Synch the queue "Synchronising `$myq to `$sq" $sq = [system.collections.queue]::synchronized($myq) # report again "`$sq is synchronised? :{0}" -f $sq.IsSynchronized # End Script
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