{"id":73441,"date":"2015-09-10T00:01:00","date_gmt":"2015-09-10T00:01:00","guid":{"rendered":"https:\/\/blogs.technet.microsoft.com\/heyscriptingguy\/2015\/09\/10\/use-inheritance-in-powershell-5-classes\/"},"modified":"2019-02-18T09:35:18","modified_gmt":"2019-02-18T16:35:18","slug":"use-inheritance-in-powershell-5-classes","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/scripting\/use-inheritance-in-powershell-5-classes\/","title":{"rendered":"Use Inheritance in PowerShell 5 Classes"},"content":{"rendered":"

Summary<\/b>: Ed Wilson, Microsoft Scripting Guy, talks about using inheritance with Windows PowerShell 5.0 classes in Windows 10.<\/span><\/p>\n

Microsoft Scripting Guy, Ed Wilson, is here. Today I want to talk about class inheritance with Windows PowerShell 5.0 in Windows 10.<\/p>\n

In Introduction to PowerShell 5 Classes<\/a>, I talked about class design and I mentioned how important it was to spend time designing classes before you begin the writing. As it turns out, I did not really do that. In PowerShell 5: Create Simple Class<\/a>, I designed a Car<\/b> class, but you know what? Nearly every property, method, and enum that I designed for the Car <\/b>class, also applies to a truck, to a motorcycle, to a recreational vehicle, and maybe even to a boat, a quad runner, or even an airplane. Even, if I don’t know if a quad runner has a vehicle identification number (VIN), it certainly has a make, a model, a year, and a color.<\/p>\n

So, instead of having created a Car<\/b> class, I should have created a Vehicle<\/b> base class. Now, the sole purpose of the Vehicle<\/b> base class would be to define properties that all vehicles would possess. In fact, if I do something like the following…<\/p>\n

Make<\/p>\n

Model<\/p>\n

Year<\/p>\n

Color<\/p>\n

…I could even use those same four properties to describe a bicycle.<\/p>\n

In Active Directory Domain Services (AD DS) we have the following:<\/p>\n

Person > Organizational Person > User > Computer<\/p>\n

Note <\/b> As an aside, there is a good site on MSDN that documents the Computer class<\/a> and shows from where each attribute derives. This is also why in the old days, when doing LDAP types of queries, if I wanted to find only users, I would query for instances of the User<\/b> class, but not instances of the Computer<\/b> class. If I only queried for Users<\/b>, I would also get Computers<\/b> because they derive from Users<\/b>.<\/p>\n

Create a Vehicle class<\/h2>\n

The first thing I want to do is create a base class, which will be called Vehicle<\/b>. This is the same as when I created my Car<\/b> class. I use the Class<\/b> keyword, specify a name and a script block, and create my properties.<\/p>\n

Note <\/b> For more information about creating a simple PowerShell 5.0 class, see PowerShell 5: Create Simple Class<\/a>.<\/p>\n

Here is my Vehicle<\/b> base class:<\/p>\n

Class Vehicle<\/strong><\/p>\n

{<\/p>\n

    [datetime]$year<\/p>\n

    [String]$model<\/p>\n

    [string]$make<\/p>\n

    [String]$color<\/p>\n

}<\/p>\n

Inherit the base class<\/h2>\n

Now I want to create my Car<\/b> class. This time, I will inherit the four common properties from the base Vehicle<\/b> class. This is very easy to do. I again use the Class<\/b> keyword and specify a name, but I also use a colon and specify the class that I inherit from. In the script block, I add the new properties that make my new class unique. Here is an example of creating the Car<\/b> class by inheriting from the Vehicle<\/b> class:<\/p>\n

Class Vehicle<\/strong><\/p>\n

{<\/p>\n

    [datetime]$year<\/p>\n

    [String]$model<\/p>\n

    [string]$make<\/p>\n

    [String]$color<\/p>\n

}<\/p>\n

Class Car : Vehicle<\/p>\n

{<\/p>\n

 [string]$vin<\/p>\n

}<\/p>\n

Now when I call the static New()<\/b> method from my Car<\/b> class, I get all of the properties— those from the Vehicle<\/b> base class and the new VIN<\/b> property I added in my Car<\/b> class. Here is the method call I use:<\/p>\n

[car]::new()<\/p>\n

The code and the output from the code are shown in the following image:<\/p>\n

\"Image<\/a><\/p>\n

Now I can use any of the techniques I used in PowerShell 5: Create Simple Class<\/a> to populate the properties of my new instance of a Car<\/b> class.<\/p>\n

Now you have a good understanding about using class inheritance. Windows PowerShell 5.0 Class Week 2 will continue tomorrow when I will talk about more cool stuff.<\/p>\n

I 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.<\/p>\n

Ed Wilson, Microsoft Scripting Guy<\/b> <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Summary: Ed Wilson, Microsoft Scripting Guy, talks about using inheritance with Windows PowerShell 5.0 classes in Windows 10. Microsoft Scripting Guy, Ed Wilson, is here. Today I want to talk about class inheritance with Windows PowerShell 5.0 in Windows 10. In Introduction to PowerShell 5 Classes, I talked about class design and I mentioned how […]<\/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":[615,609,3,608,45],"class_list":["post-73441","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-scripting","tag-classes","tag-powershell-5","tag-scripting-guy","tag-windows-10","tag-windows-powershell"],"acf":[],"blog_post_summary":"

Summary: Ed Wilson, Microsoft Scripting Guy, talks about using inheritance with Windows PowerShell 5.0 classes in Windows 10. Microsoft Scripting Guy, Ed Wilson, is here. Today I want to talk about class inheritance with Windows PowerShell 5.0 in Windows 10. In Introduction to PowerShell 5 Classes, I talked about class design and I mentioned how […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/posts\/73441","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=73441"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/posts\/73441\/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=73441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/categories?post=73441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/scripting\/wp-json\/wp\/v2\/tags?post=73441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}