I'm new to powershell. I'm trying to write an error handler to wrap around my script.  Part of the error handler is dumping out some variable settings.  I spent a while trying to do this and couldn't google a complete solution so I thought I'd post something.

I want to display the $myinvocation variable. In powershell you can do this

PS C:\> $myInvocation

for my purpose I want to create a stringbuilder object and append the $myinvocation info.  I tried this

$sbOut = new-object System.Text.Stringbuilder
$sbOut.appendLine($myinvocation)
$sbOut.ToString()

This produces
                                   Capacity                                MaxCapacity                                     Length
                                   --------                                -----------                                     ------
                                         86                                 2147483647                                         45
System.Management.Automation.InvocationInfo

This is not what I wanted so I tried
$sbOut.appendLine(($myinvocation|format-list *))

This produced
                                   Capacity                                MaxCapacity                                     Length
                                   --------                                -----------                                     ------
                                        606                                 2147483647                                        305
Microsoft.PowerShell.Commands.Internal.Format.FormatStartData Microsoft.PowerShell.Commands.Internal.Format.GroupStartData Micros
oft.PowerShell.Commands.Internal.Format.FormatEntryData Microsoft.PowerShell.Commands.Internal.Format.GroupEndData Microsoft.Powe
rShell.Commands.Internal.Format.FormatEndData

Finally I figured out how to produce what I wanted:
$sbOut = new-object System.Text.Stringbuilder
[void]$sbOut.appendLine(($myinvocation|out-string))
$sbOut.ToString()

MyCommand        : $sbOut = new-object System.Text.Stringbuilder                
                   [void]$sbOut.appendLine(($myinvocation|out-string))                  
                   $sbOut.ToString()
                  
BoundParameters  : {}
UnboundArguments : {}
ScriptLineNumber : 0
OffsetInLine     : 0
HistoryId        : 13
ScriptName       :
Line             :
PositionMessage  :
InvocationName   :
PipelineLength   : 2
PipelinePosition : 1
ExpectingInput   : False
CommandOrigin    : Runspace

Note the [void] in front of the stringbuilder variable doesn't show the Capacity,MaxCapacity of the stringbuilder object.  The pipe to out-string makes the output a string.

It's not pretty but it works.