PS > Set-Variable -Name string -Value "New Value" -Option None -Force in Visual Studio .NET

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PS > Set-Variable -Name string -Value "New Value" -Option None -Force
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Variables, Arrays, and Hashtables
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The Get-Variable cmdlet is used to retrieve variables, as follows:
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PS > Get-Variable -Name string Name ---string Value ----New Value
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This example returns an object of the type SystemManagementAutomation PSVariable, which contains properties that describe the variable If you want to display only the variable s value, use the -ValueOnly switch parameter
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PS > Get-Variable -Name string -ValueOnly New Value
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This example returns an object of the type SystemString This corresponds to just typing a dollar sign ($) followed by the variable s name:
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PS > $string New Value
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You can display additional information about a variable by using the Get-Variable cmdlet and sending the object to the Format-List cmdlet
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PS > Get-Variable -Name string | Format-List Name : string Description : Created using New-Variable Value : New Value Visibility : Public Module : ModuleName : Options : None Attributes : {}
To clear the value of a variable, use the Clear-Variable cmdlet
PS > Clear-Variable -Name string
When using the Clear-Variable cmdlet, the variable s value is set to null You can also set a variable to null using the assignment operator
PS > $string = $null
To delete a variable, use the Remove-Variable cmdlet
PS > Remove-Variable -Name string
NOTE You cannot delete variables set as constants or variables owned by the system
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Data Types
When you use the assignment operator = to set a variable to a specified value, Windows PowerShell automatically assigns the best-suited data type for the given value In our first example, we used a simple string as input, which stored an object of the type SystemString in a variable In this example, we set a variable to a numeric value:
PS > $int = 10
We can use the GetType() method with the FullName property to find out the variable s data type
PS > $intGetType()FullName SystemInt32
This shows that the variable $int is of the type SystemInt32, which represents a 32-bit integer If we use a number that is too large for a 32-bit integer, a different data type will be used
PS > $int64 = 10000000000000 PS > $int64GetType()FullName SystemInt64
If the value is a decimal number, the SystemDouble data type will be used
PS > $decimal = 12 PS > $decimalGetType()FullName SystemDouble
Rather than letting Windows PowerShell assign the data type, you can specify the type for a variable To assign a specific data type to a variable, enclose the data type s name in square brackets before the variable name If the data type is not at the root of the System namespace, you must type the data type s full name; otherwise, you can omit the System part of the name, as shown in this example:
PS > [uri]$url = "http://SPServer01" PS > $urlGetType()FullName SystemUri
Here, we use an URL as value, but rather than letting Windows PowerShell assign a data type we assigned it a specific data type, giving us a completely different type of object The type SystemUri is an object representation of a uniform resource identifier (URI), which, according to Microsoft Developer Network (MSDN), is a compact representation of a resource available to your application on the intranet or Internet The next example demonstrates how to assign the type SystemInt32 to a variable
PS > [int32]$val = 32 PS > $val 32
5:
Variables, Arrays, and Hashtables
Since we assigned a fixed type to the variable, only values within the permitted range for the type are allowed If we try to add a string value to the typed variable, an error occurs
PS > [int32]$val = "http://SPServer01" Cannot convert value "http://SPServer01" to type "SystemInt32" Error: "Input string was not in a correct format" At line:1 char:12 + [int32]$val <<<< = "http://SPServer01" + CategoryInfo : MetadataError: (:) [], ArgumentTransformationMetadataException + FullyQualifiedErrorId : RuntimeException
Windows PowerShell also supports a number of type accelerators (also known as type shortcuts) The type accelerators allow you to use short name syntax for commonly used NET types For instance, instead of typing [SystemXmlXmlDocument], you can simply type [xml] Table 5-1 shows some of the most common type accelerators
Type
[string] [int] [long] [char]
Description String of Unicode characters 32-bit integer 64-bit integer Unicode character True or false value 8-bit integer Decimal number
Example
[string]"Hi" [int32]12 [int64]1200000 [char]34 [bool]$false [byte]255 [decimal]1244
[bool] [byte] [decimal] [double] [float] [array] [xml] [adsi] [wmi]
Double-precision decimal [double]1244 number Single-precision floating number An array XML document Active Directory service interface Type accelerator for ManagementObject
[float]1244 [array]1,2,3 [hashtable]@{"Name"="Value"} [xml]"<name>Sergey</name>" [adsi] "LDAP:// DC=PowerShell,DC=nu" [wmi]("Win32_ComputerSystem Name='SPServer01'")
[hashtable] Hashtable
Table 5-1 Common Windows PowerShell Type Accelerators
PowerShell for Microsoft SharePoint 2010 Administrators
To find out the type accelerator s corresponding NET type, use the FullName property
PS > ([string])FullName SystemString PS > ([xml])FullName SystemXmlXmlDocument PS > ([adsi])FullName SystemDirectoryServicesDirectoryEntry
NOTE Type accelerators are considered before regular type lookup Regular type lookup searches for the name typed within square brackets without prepending System If that fails, System is prepended For accelerated types in the System namespace, the accelerator ensures that you won t pick up some global (not in any namespace) type
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