问题
I'm trying to do something like:
Get-WmiObject Win32_NetworkAdapterConfiguration `
-Filter "DefaultIPGateway!=NULL"
But I have an error:
Get-WmiObject : Invalid query At line:1 char:14 + Get-WmiObject <<<< Win32_NetworkAdapterConfiguration -Filter "DefaultIPGateway!=NULL" + CategoryInfo : InvalidOperation: (:) [Get-WmiObject], ManagementException + FullyQualifiedErrorId : GetWMIManagementException,Microsoft.PowerShell.Commands.GetWmiObjectCommand
It's strange, because when I try to get type of DefaultIPGateway values. It's System.Array for the existent values:
PS> $result[0].DefaultIPGateway.Gettype()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True String[] System.Array
And a NULL for the nonexistent values:
PS> $result[1].DefaultIPGateway.GetType()
You cannot call a method on a null-valued expression.
At line:1 char:36
+ $result[1].DefaultIPGateway.GetType <<<< ()
+ CategoryInfo : InvalidOperation: (GetType:String) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull
Could someone help me to understand why my WQL doesn't work and what I should do to make it go?
回答1:
I'm not sure how to make the filter query work as I don't know how to access the array elements to check them, but have a workaround:
Get-WmiObject Win32_NetworkAdapterConfiguration | Where-Object { $_.DefaultIPGateway -ne $null }
This way, powershell will be responsible for filtering the objects returned from the query, rather than WMI doing it during retrieval.
回答2:
WQL-queries does not support array-properties.
Note WQL does not support queries of array datatypes.
Source: Querying with WQL @ MSDN
The solution is to filter out the objects with null-value using PowerShell's Where-Object
cmdlet.
Get-WmiObject -Class Win32_NetworkAdapterConfiguration |
Where-Object { $_.DefaultIPGateway }
来源:https://stackoverflow.com/questions/28502337/wql-in-filter-doesnt-work