{"id":3594,"date":"2013-05-21T00:01:00","date_gmt":"2013-05-21T00:01:00","guid":{"rendered":"https:\/\/blogs.technet.microsoft.com\/heyscriptingguy\/2013\/05\/21\/powershell-hash-tables-that-contain-keywords-hmm\/"},"modified":"2013-05-21T00:01:00","modified_gmt":"2013-05-21T00:01:00","slug":"powershell-hash-tables-that-contain-keywords-hmm","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/scripting\/powershell-hash-tables-that-contain-keywords-hmm\/","title":{"rendered":"PowerShell Hash Tables that Contain Keywords…hmm…"},"content":{"rendered":"

Summary<\/strong>: Microsoft Scripting Guy, Ed Wilson, talks about dealing with Windows PowerShell hash tables that contain keywords. Dude!<\/span>\n\"Hey, Hey, Scripting Guy! I have a problem in that I want to create a hash table from an array. This is easy enough to do, but if the array contains keywords, then everything goes pear shaped. Any ideas?\n—GP\n\"Hey, Hello GP,\nMicrosoft Scripting Guy, Ed Wilson, is here. Things are certainly  becoming exciting around here. The Scripting Wife and I have been busy planning for TechEd North America in New Orleans and TechEd Europe in Madrid. As it turns out, we will have a Scripting Guys booth in both New Orleans and Madrid. In addition, we are sharing our booth with the folks from PowerShell.org; so, that means that Windows PowerShell people like Don Jones will be there. I am also going to be working with the Windows PowerShell team on a couple of instructor lead labs that (to be quite honest) will absolutely knock your socks off —they are that cool. More details to follow.<\/p>\n

Creating a hash table that contains keywords<\/h2>\n

Well GP, I have never actually run across your problem before. This is because I avoid using Windows PowerShell keywords. I refer to the Help topic, about_Language_Keywords<\/a>, from time to time to refresh my mind when it comes to reserved keywords.<\/p>\n

Note<\/strong>   As an aside, I do the same thing for automatic variables. For more information, see about_Automatic_Variables<\/a> in the Script Center. \nHere is the easy way to bring up the about_Language_Keywords Help topic:<\/p>\n

help -Category helpfile -Name *keyword*           \nSo, this is all on the preventive side of things. To experiment with this, the first thing I do is create an array that contains a few keywords—in addition to other words. I then use the ForEach<\/strong> <\/em>command to add the items in the array to a hash table. This technique is shown here:<\/p>\n

PS C:> $a = “key”,”keys”,”property”,”properties”,”red”,”blue”,”green”<\/p>\n

PS C:> $h = @{}<\/p>\n

PS C:> foreach ($wd in $a) {$h[$wd] = $true}\nIf I look at the hash table that is contained in the $h<\/strong> variable, I see the following:<\/p>\n

PS C:> $h<\/p>\n

 <\/p>\n

Name                           Value<\/p>\n

—-                           —–<\/p>\n

red                            True<\/p>\n

property                       True<\/p>\n

green                          True<\/p>\n

keys                           True<\/p>\n

properties                     True<\/p>\n

blue                           True<\/p>\n

key                            True\nSo far, so good.  But suppose I want to look at the properties or the keys of my hash table. I try the following:<\/p>\n

PS C:> $h.Keys<\/p>\n

True<\/p>\n

PS C:> $h.key<\/p>\n

True<\/p>\n

PS C:> $h.property<\/p>\n

True<\/p>\n

PS C:> $h.properties<\/p>\n

True\nSo I am wondering what the properties really are for this hash table. I can find out by using the Get-Member<\/strong> command as shown here.<\/p>\n

PS C:> Get-Member -InputObject $h -MemberType Properties<\/p>\n

 <\/p>\n

   TypeName: System.Collections.Hashtable<\/p>\n

 <\/p>\n

Name           MemberType Definition<\/p>\n

—-           ———- ———-<\/p>\n

Count          Property   int Count {get;}<\/p>\n

IsFixedSize    Property   bool IsFixedSize {get;}<\/p>\n

IsReadOnly     Property   bool IsReadOnly {get;}<\/p>\n

IsSynchronized Property   bool IsSynchronized {get;}<\/p>\n

Keys           Property   System.Collections.ICollection Keys {get;}<\/p>\n

SyncRoot       Property   System.Object SyncRoot {get;}<\/p>\n

Values         Property   System.Collections.ICollection Values {get;}\nThere really is a property called <\/span>Keys<\/strong>, <\/em>and I really cannot seem to access it. So what do I do?<\/span>\nI imagine that I will take a look at the base Windows PowerShell object. To do this, I use the PSBase<\/strong> <\/em>property. All Windows PowerShell objects have a base object, but most of the time, it is not necessary to fool with it. Here, however, I suspect that I will be able to get past the keys keys <\/em>kind of thing. Here is the base object:<\/p>\n

PS C:> $h.psbase<\/p>\n

IsReadOnly     : False<\/p>\n

IsFixedSize    : False<\/p>\n

IsSynchronized : False<\/p>\n

Keys           : {red, property, green, keys…}<\/p>\n

Values         : {True, True, True, True…}<\/p>\n

SyncRoot       : System.Object<\/p>\n

Count          : 7\nNow, I see there is a Keys<\/strong> <\/em>property on the base object. So I attempt to access it. Here is how I do it:<\/p>\n

PS C:> $h.psbase.keys<\/p>\n

red<\/p>\n

property<\/p>\n

green<\/p>\n

keys<\/p>\n

properties<\/p>\n

blue<\/p>\n

key\nGP, that is all there is to using PSBase<\/strong> when dealing with hash tables. By the way, I tested this on Windows PowerShell 2.0 and on Windows PowerShell 3.0, so you should be safe to use this technique. Join me tomorrow when I will talk about more cool Windows PowerShell stuff.\nI invite you to follow me on Twitter<\/a> and Facebook<\/a>. If you have any questions, send email to me at scripter@microsoft.com<\/a>, or post your questions on the Official Scripting Guys Forum<\/a>. See you tomorrow. Until then, peace.\nEd Wilson, Microsoft Scripting Guy<\/strong> <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Summary: Microsoft Scripting Guy, Ed Wilson, talks about dealing with Windows PowerShell hash tables that contain keywords. Dude!  Hey, Scripting Guy! I have a problem in that I want to create a hash table from an array. This is easy enough to do, but if the array contains keywords, then everything goes pear shaped. Any […]<\/p>\n","protected":false},"author":596,"featured_media":87096,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[427,3,4,45],"class_list":["post-3594","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-scripting","tag-hashtables","tag-scripting-guy","tag-scripting-techniques","tag-windows-powershell"],"acf":[],"blog_post_summary":"

Summary: Microsoft Scripting Guy, Ed Wilson, talks about dealing with Windows PowerShell hash tables that contain keywords. Dude!  Hey, Scripting Guy! I have a problem in that I want to create a hash table from an array. This is easy enough to do, but if the array contains keywords, then everything goes pear shaped. Any […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/posts\/3594","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/users\/596"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/comments?post=3594"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/posts\/3594\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/media\/87096"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/media?parent=3594"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/categories?post=3594"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/tags?post=3594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}