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TYPE CONVERSIONS
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PowerShell s type-conversion algorithm In this section, we ll cover the steps in the conversion process in painful detail much more than you ll generally need to know in your day-to-day work. However, if you really want to be an expert on PowerShell, this stuff s for you.
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Type conversion is one of the areas of the PowerShell project that grew organically . In other words, we sat down, wrote a slew of specifications, threw them out, and ended up doing something completely different. This is one of the joys of this type of work. Nice clean theory falls apart when you put it in front of real people. The type conversion algorithm as it exists today is the result of feedback from many of the early adopters both inside Microsoft as well as outside. The betaplace community helped us tremendously in this area.
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In general, the PowerShell type conversions are separated into two major buckets: PowerShell Language Standard Conversions These are built-in conversions performed by the engine itself. They are always processed first and consequently cannot be overridden. This set of conversions is largely guided by the historical behavior of shell and scripting languages, and is not part of the normal .NET type conversion system. .NET-based custom converters This class of converters uses (and abuses in some cases) existing .NET mechanisms for doing type conversion. Table 3.5 lists the set of built-in language conversions that PowerShell uses. The conversion process always starts with an object of a particular type and tries to produce a representation of that object in the requested target type. The conversions are applied in the order shown in table 3.5. Only one conversion is applied at a time. The PowerShell engine does not automatically chain conversions.
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Table 3.5 PowerShell language standard conversions To Target Type [string] [char] Any kind of number [bool] [PSObject] Any other type of object Result Description (empty string) `0 (string containing a single character 0) The object corresponding to 0 for the corresponding numeric type. $false $null $null continued on next page
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Converting From $null
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WORKING WITH TYPES
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Table 3.5
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PowerShell language standard conversions (continued) To Target Type Base Class Result Description The original object is returned unchanged.
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Converting From Derived Class
Anything
[void]
The object is discarded.
Anything
[string]
The PowerShell internal string converter is used.
Anything
[xml]
The original object is first converted into a string and then into an XML Document object.
Array of type [X]
Array of type [Y]
PowerShell creates a new array of the target type, then copies and converts each element in the source array into an instance for the target array type. Creates an array containing one element and then places the singleton object into the array, converting if necessary.
Non-array (singleton) object
Array of type [Y]
IDictionary
[Hashtable]
A new instance of System.Collections.Hashtable is created, and then the members of the source IDictionary are copied into the new object.
[string] [string] [string]
[char[]] [regex] Number
Converts the string to an array of characters. Constructs a new instance of a .NET regular expression object. Converts the string into a number using the smallest representation available that can accurately represent that number. If the string is not purely convertible (i.e., only contains numeric information) then an error is raised.
[int]
System.Enum
Converts the integer to the corresponding enumeration member if it exists. If it doesn t, a conversion error is generated.
If none of the built-in PowerShell language-specific conversions could be applied successfully then the .NET custom converters are tried. Again, these converters are tried in order until a candidate is found that will produce the required target type. This candidate conversion is applied. If the candidate conversion throws an exception (that is, a matching converter is found but it fails during the conversion process) then
TYPE CONVERSIONS
no further attempt to convert this object will be made and the overall conversion process will be considered to have failed.
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