#Create Object With Cast
function CreateWith-Cast
{
    $ex = [System.Diagnostics.ProcessStartInfo]@{fileName="cmd"}
    [System.Diagnostics.Process]::Start($ex)
}

#Use New-Object
function Create-NormalObject
{
    $ex2 = New-Object -TypeName System.Diagnostics.ProcessStartInfo -ArgumentList "cmd"
    [System.Diagnostics.Process]::Start($ex2)
}

#Cast
Measure-Command -Expression {$ex = [System.Diagnostics.ProcessStartInfo]@{fileName="cmd"}; [System.Diagnostics.Process]::Start($ex)}

#New-Object
Measure-Command -Expression {$ex2 = New-Object -TypeName System.Diagnostics.ProcessStartInfo -ArgumentList "cmd"; [System.Diagnostics.Process]::Start($ex2)}




#New-Object Automatically Calls the Default Constructor for us
$test = New-Object -TypeName System.Diagnostics.ProcessStartInfo
$test.GetType()

#IsPublic IsSerial Name                                     BaseType
#-------- -------- ----                                     --------
#True     False    ProcessStartInfo                         System.Object

#If you want you can overload the defualt constructor in two ways when using New-Object:
$test = New-Object -TypeName System.Diagnostics.ProcessStartInfo("cmd")
$test

#Verb                    :
#Arguments               :
#CreateNoWindow          : False
#EnvironmentVariables    : {PROCESSOR_LEVEL, CommonProgramFiles, PROCESSOR_IDENTIFIER, TEMP...}
#RedirectStandardInput   : False
#RedirectStandardOutput  : False
#RedirectStandardError   : False
#StandardErrorEncoding   :
#StandardOutputEncoding  :
#UseShellExecute         : True
#Verbs                   : {}
#UserName                :
#Password                :
#Domain                  :
#LoadUserProfile         : False
#FileName                : cmd
#WorkingDirectory        :
#ErrorDialog             : False
#ErrorDialogParentHandle : 0
#WindowStyle             : Normal

#If you use two arguements you will see that it uses the next constructor
$test = New-Object -TypeName System.Diagnostics.ProcessStartInfo("cmd", "ramdom args")
$test

#Verb                    :
#Arguments               : ramdom args
#CreateNoWindow          : False
#EnvironmentVariables    : {PROCESSOR_LEVEL, CommonProgramFiles, PROCESSOR_IDENTIFIER, TEMP...}
#RedirectStandardInput   : False
#RedirectStandardOutput  : False
#RedirectStandardError   : False
#StandardErrorEncoding   :
#StandardOutputEncoding  :
#UseShellExecute         : True
#Verbs                   : {}
#UserName                :
#Password                :
#Domain                  :
#LoadUserProfile         : False
#FileName                : cmd
#WorkingDirectory        :
#ErrorDialog             : False
#ErrorDialogParentHandle : 0
#WindowStyle             : Normal

#Alternatively you can use the arguementlist parameter
$test = New-Object -TypeName System.Diagnostics.ProcessStartInfo -ArgumentList "cmd"
$test

#Verb                    :
#Arguments               :
#CreateNoWindow          : False
#EnvironmentVariables    : {PROCESSOR_LEVEL, CommonProgramFiles, PROCESSOR_IDENTIFIER, TEMP...}
#RedirectStandardInput   : False
#RedirectStandardOutput  : False
#RedirectStandardError   : False
#StandardErrorEncoding   :
#StandardOutputEncoding  :
#UseShellExecute         : True
#Verbs                   : {}
#UserName                :
#Password                :
#Domain                  :
#LoadUserProfile         : False
#FileName                : cmd
#WorkingDirectory        :
#ErrorDialog             : False
#ErrorDialogParentHandle : 0
#WindowStyle             : Normal


$test = New-Object -TypeName System.Diagnostics.ProcessStartInfo -ArgumentList "cmd","random args"
$test

#Verb                    :
#Arguments               : ramdom args
#CreateNoWindow          : False
#EnvironmentVariables    : {PROCESSOR_LEVEL, CommonProgramFiles, PROCESSOR_IDENTIFIER, TEMP...}
#RedirectStandardInput   : False
#RedirectStandardOutput  : False
#RedirectStandardError   : False
#StandardErrorEncoding   :
#StandardOutputEncoding  :
#UseShellExecute         : True
#Verbs                   : {}
#UserName                :
#Password                :
#Domain                  :
#LoadUserProfile         : False
#FileName                : cmd
#WorkingDirectory        :
#ErrorDialog             : False
#ErrorDialogParentHandle : 0
#WindowStyle             : Normal

#If you specify too many arguements and a valid constructor cannot be found you will get an error.
$test = New-Object -TypeName System.Diagnostics.ProcessStartInfo -ArgumentList "cmd","random args", "invalidoverload"
$test

#New-Object : Cannot find an overload for "ProcessStartInfo" and the argument count: "3".
#At line:1 char:9
#+ $test = New-Object -TypeName System.Diagnostics.ProcessStartInfo -ArgumentList " ...
#+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#    + CategoryInfo          : InvalidOperation: (:) [New-Object], MethodException
#    + FullyQualifiedErrorId : ConstructorInvokedThrowException,Microsoft.PowerShell.Commands.NewObjectCommand

#You can also set properties straight after creation by using the -Property parameter which accepts a hash table where the keys are the name of the properties and
#the values are what you want to set the properties to.
$test = New-Object -TypeName System.Diagnostics.ProcessStartInfo -ArgumentList "cmd","random args" -Property @{CreateNoWindow=$True;RedirectStandardOutput=$True;UseShellExecute=$False}
$test

#Verb                    :
#Arguments               : random args
#CreateNoWindow          : True
#EnvironmentVariables    : {PROCESSOR_LEVEL, CommonProgramFiles, PROCESSOR_IDENTIFIER, TEMP...}
#RedirectStandardInput   : False
#RedirectStandardOutput  : True
#RedirectStandardError   : False
#StandardErrorEncoding   :
#StandardOutputEncoding  :
#UseShellExecute         : False
#Verbs                   : {}
#UserName                :
#Password                :
#Domain                  :
#LoadUserProfile         : False
#FileName                : cmd
#WorkingDirectory        :
#ErrorDialog             : False
#ErrorDialogParentHandle : 0
#WindowStyle             : Normal


#Call No Constructor (struct??)
$test = [System.Diagnostics.ProcessStartInfo]
$test.GetType()

#IsPublic IsSerial Name                                     BaseType
#-------- -------- ----                                     --------
#False    True     RuntimeType                              System.Type

#if you try to do $test.Redir nothing comes up in intellisense, this is because at this point there is no properties with that name

#However if you call a constuctor like:
$test = [System.Diagnostics.ProcessStartInfo]("cmd")
$test.GetType()

#IsPublic IsSerial Name                                     BaseType
#-------- -------- ----                                     --------
#True     False    ProcessStartInfo                         System.Object

#You will get options in intellisense, in addition i noticed that the base type has changed.

#You cant overload with the cast method
$test = [System.Diagnostics.ProcessStartInfo]("cmd","aaa")

#Cannot convert the "System.Object[]" value of type "System.Object[]" to type "System.Diagnostics.ProcessStartInfo".
#At line:1 char:1
#+ $test = [System.Diagnostics.ProcessStartInfo]("cmd","aaa")
#+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#    + CategoryInfo          : InvalidArgument: (:) [], RuntimeException
#    + FullyQualifiedErrorId : ConvertToFinalInvalidCastException

#Call Default Constructor and Init Properties
$test =[System.Diagnostics.ProcessStartInfo]@{CreateNoWindow=$True;RedirectStandardOutput=$True;fileName="cmd";UseShellExecute=$False}
$test.GetType()