If it is a list with more than 1 thing in it, return $true.Īs you can see, the Array and ArrayList fall into rules 6.2-6.4 because they implement IList, whereas the SearchResultCollection falls into rule 6.1 because it does not implement IList so the conversion to a list fails, which means it was a plain old non-null object which evaluates to $true in Powershell.If the string returned by the ToString () method is to be written to an XML file, its String.ToLowerInvariant method should be called first to convert it to lowercase. Note that XML is case-sensitive, and that the XML specification recognizes 'true' and 'false' as the valid set of Boolean values. If it is a list and has 1 element, return the IsTrue(list) value (ie recurse on the one element and return its value. This method returns the constants 'True' or 'False'.If it is a list and has 0 elements, return $false.If this conversion fails, return $true (meaning it was an object that was not null, not any of the "special" things above, and not a list for PS to count).If it is a SwitchParameter, call its own ToBool() method. inputs context is identical except that the inputs context preserves Boolean values as Booleans instead of converting them to strings.If it is a number, return $false if it is 0, else return $true.If it is a string, return $false if it is empty, else return $true.Expressions in YAML pipelines may be literals such as String, Boolean, and. If it is a boolean, return the boolean. Used the powershell script to convert string array of keys foo, bar to.In there you can see the algorithm (which I am assuming is being used in this case) that converts objects to boolean. Browse down to the IsTrue(object obj) method and decompile it.
POWERSHELL CONVERT STRING TO BOOLEAN FREE
You can see (what I think is) the proof of this if you load up Reflector ( dotPeek, ILSpy, and JustDecompile are free alternatives): This is apparently what Powershell uses to determine if it should "look inside" when it converts the object to a boolean. You can see (what I think is) the proof of this if you load up Reflector (dotPeek, ILSpy, and JustDecompile are free alternatives): Open from the GAC Expand the. GetInterfaces()Īs you can see, both System.Array and implement IList. This is apparently what Powershell uses to determine if it should 'look inside' when it converts the object to a boolean.
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