PS > "Hello" -isnot [SystemString] False PS > "Hello" -isnot [SystemInt32] True in Visual Studio .NET

Creating QR Code in Visual Studio .NET PS > "Hello" -isnot [SystemString] False PS > "Hello" -isnot [SystemInt32] True

PS > "Hello" -isnot [SystemString] False PS > "Hello" -isnot [SystemInt32] True
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You can convert objects to a specified type using the -as operator
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PS > 1123 -as [SystemInt32] 1
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In this example, we convert the numeric value 1123 to an object of the type
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Operator
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-is -isnot -as
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Description Checks if an object is a specified type Checks if an object is not a specified type Converts an object to a specified type
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Table 6-6 Windows PowerShell Type Operators
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Operators
Special Operators
Windows PowerShell includes special operators that you can use to perform tasks that cannot be performed by the other operators Special operators in Windows PowerShell allow you to perform tasks such as dot-sourcing, creating arrays, and more Table 6-7 lists the special operators that are available The range operator () is used to retrieve a specified range from an array
PS > $array = 1,2,3,4,5 PS > $array[02] 1 2 3
This example retrieves the elements with index 0 to 2
Operator
Name Range operator
Description Indicates a range of values; the first value in the range goes before the operator and the last value goes after it Runs a command, script, or script block Runs a script and includes the items, functions, and variables in the script to the current scope Calls the static properties operator and methods of a NET Framework class Formats strings by using the format method of string objects Returns the result of an expression placed in a parenthetical list Returns one or more statements as an array
& :: -f $() @()
Call operator Dot-sourcing operator Static member operator Format operator Subexpression operator Array subexpression operator Comma operator
As a binary operator, creates an array; as a unary operator, creates an array with one member
Table 6-7 Windows PowerShell Special Operators
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The range operator also accepts negative ranges
PS > $array[-1-2] 5 4
The call operator (&) in Windows PowerShell is used to run commands, scripts, or script blocks One thing to keep in mind is that the call operator does not interpret parameters This example demonstrates how to run a command stored in a variable and represented by a string:
PS > $myCommand = "Get-SPWeb" PS > & $myCommand -Identity http://SPServer01 Url --http://spserver01
Here, we use "Get-SPWeb" as the input string to the variable and specify the arguments when we call the variable You can also use the call operator to run script blocks A script block can contain any amount of code and is defined by braces
PS > & { 1 + 1 } 2
The dot-sourcing operator () is used to include variables and functions from a script to the current scope This means that you can store functions and variables in a script and use the dot-source notation to quickly access the functions and variables contained in the script Here is an example:
PS > PS > PS > This $variableInScript \myScriptps1 $variableInScript variable is placed in the myScriptps1 script
Here, we first try to call the variable $variableInScript Since we have not created a variable called $variableInScript in our current session, the command does not return a value Next, we dot-source our script, which contains the variable $variableInScript When we call the variable a second time, a value is returned The static member operator (::) is used to call static methods and properties of a NET Framework class To find out static methods and properties of a class, use the Get-Member cmdlet with the Static switch parameter
PS > [SystemMath] | Get-Member -Static
6:
Operators
Here are some examples of using the static member operator with the static methods and properties of the SystemMath class: Use the static method Pow() to return the specified number raised to the specified power:
PS > [SystemMath]::Pow(5,5) 3125
Use Sqrt() to calculate the square root of 9:
PS > [SystemMath]::Sqrt(9) 3
Call the static property PI, which represents the ratio of a circle to its diameter:
PS > [SystemMath]::PI 3,14159265358979
The format operator (-f) is a binary operator that uses the same formatting rules as the Format() method in the NET Framework It takes a string on the left side and an array of values on the right side Here is an example:
PS > "{0}" -f "PowerShell" PowerShell
In this example, the value enclosed in braces represents the index of the element on the right side Since the format operator allows an array on the right side, you can use more values
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