Common points of confusion in Visual Basic .NET

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Common points of confusion
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none of them are wrong. Some are just easier to learn, remember, and repeat than others, which is why I ve focused on the techniques I have, in the order that I did. There s yet another way, because the Stop-Service cmdlet can be directly told which processes to stop:
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Stop-Process -name BITS
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I didn t include this in the preceding list, because the -name parameter of StopService doesn t accept wildcards, so it can t do exactly what the other examples are doing. Those examples also illustrate some important differences between using native cmdlets and WMI:
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Native cmdlets filtering criteria usually use * as a wildcard character, where WMI filtering uses the percent sign (%) don t confuse that percent sign for the ForEach-Object alias! This percent sign is enclosed within the value of GetWmiObject s -filter parameter, and it isn t an alias. Native objects often have similar capabilities to WMI ones, but the syntax may differ. Here, the ServiceController objects produced by Get-Service have a Stop() method; when I access those same services through the WMI Win32_Service class, the method name becomes StopService(). Native filtering often uses native comparison operators, such as -eq; WMI uses programming-style operators such as = or LIKE.
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Which do you use It doesn t matter, because there is no one right way. You may even end up using a mix of these, depending on the circumstances and the capabilities that the shell is able to offer you for the task at hand.
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13.5.2 WMI methods versus cmdlets
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When do you use a WMI method or a cmdlet to accomplish a task It s a simple choice:
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If you retrieved something by using Get-WmiObject, you ll take action on that something by using a WMI method. You can execute the method by using Invoke-WmiMethod or the ForEach-Object approach. If you retrieved something by using an approach other than Get-WmiObject, you ll use a native cmdlet to take action against that something. Or, if whatever you retrieved has a method but no supporting cmdlet, you might use the ForEach-Object approach to execute that method.
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Notice that the lowest common denominator here is ForEach-Object: its syntax is perhaps the most difficult, but it can always be used to accomplish whatever needs to be done. You can never pipe anything to a method. You can only pipe from one cmdlet to another. If a cmdlet doesn t exist to do what you need, but a method does, then you pipe to ForEach-Object, and have it execute the method.
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Working with bunches of objects, one at a time
For example, suppose you retrieve something using a Get-Something cmdlet. You want to delete that something, but there s no Delete-Something or RemoveSomething cmdlet. The Something objects do, however, have a Delete method. You can do this:
Get-Something | ForEach-Object { $_.Delete() }
13.5.3 Method documentation
Always remember that methods are revealed by piping objects to Get-Member. Again let s use the fictional Get-Something cmdlet as an example:
Get-Something | Get-Member
WMI methods aren t documented in PowerShell s built-in help system; you ll need to use a search engine (usually searching on the WMI class name) to locate WMI method instructions and examples. Methods of non-WMI objects are also not available in
PowerShell s built-in help system. For example, if you get a member list for a service object you can see that methods named Stop and Start exist:
TypeName: System.ServiceProcess.ServiceController Name ---Name RequiredServices Disposed Close Continue CreateObjRef Dispose Equals ExecuteCommand GetHashCode GetLifetimeService GetType InitializeLifetimeService Pause Refresh Start Stop ToString WaitForStatus MemberType ---------AliasProperty AliasProperty Event Method Method Method Method Method Method Method Method Method Method Method Method Method Method Method Method Definition ---------Name = ServiceName RequiredServices = ServicesDepe... System.EventHandler Disposed(Sy... System.Void Close() System.Void Continue() System.Runtime.Remoting.ObjRef ... System.Void Dispose() bool Equals(System.Object obj) System.Void ExecuteCommand(int ... int GetHashCode() System.Object GetLifetimeService() type GetType() System.Object InitializeLifetim... System.Void Pause() System.Void Refresh() System.Void Start(), System.Voi... System.Void Stop() string ToString() System.Void WaitForStatus(Syste...
To find the documentation for these, focus on the TypeName, which in this case is System.ServiceProcess.ServiceController. Search for that complete type name in a search engine, and you ll usually come across the official developer documentation for that type, which will lead to the documentation for whatever specific method you re after.
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