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PowerShell function as parameter in function


PowerShell function as parameter in function

By : EAdrianH
Date : November 20 2020, 03:01 PM
around this issue If you say the parameter is mandatory, then PowerShell will prompt the user for the parameter's value if the user omits it.
You can call a function as the default value for a parameter. If the user omits a value for the parameter, you can run the function. You can do that like this:
code :
[DateTime] $MyDate=$(Select-Date)


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How to specify a function as the default of a scriptblock parameter in a PowerShell function?

How to specify a function as the default of a scriptblock parameter in a PowerShell function?


By : Lerato
Date : March 29 2020, 07:55 AM
To fix the issue you can do Yes, it is possible. For example, this way works for passing a function in:
code :
foo ((get-command bar).scriptblock)
Hello World Bart
function foo([scriptblock]$fun=(get-command bar).scriptblock)
{
    &$fun "Bart"
}
foo
Powershell variable is assigned the result of a function AND the parameter I passed to the function

Powershell variable is assigned the result of a function AND the parameter I passed to the function


By : Evaldo Júnior
Date : March 29 2020, 07:55 AM
Does that help $cmd.Parameters.AddWithValue() echoes the added parameter, and PowerShell functions return the entire non-captured output on the success output stream, not just the argument of the return keyword.
Quoting from about_Return (emphasis mine):
How to assign a Powershell function as an argument to a different function's parameter

How to assign a Powershell function as an argument to a different function's parameter


By : Ryle Job
Date : March 29 2020, 07:55 AM
will help you One way is to dot-source:
code :
function FunctionExecutor
{
    param
    (
        $function
    )
    . $function
}
function StartSSHsession
{   
    param(
        [switch]$useEmail
    )
    if($useEmail){
        Write-Host "Use Email"
    }else{
        Write-Host "Hi"
    }
}

function FunctionExecutor
{
    param
    (
        [switch]$useEmail,
        $function
    )
    . $function @PSBoundParameters
}
Powershell function parameter type System.ConsoleColor - Missing ')' in function parameter list

Powershell function parameter type System.ConsoleColor - Missing ')' in function parameter list


By : Finn Jensen
Date : March 29 2020, 07:55 AM
Any of those help The issue has been pointed out in the comments. You can't just assign something called Default as your parameter's default value.
Since that enum doesn't have a "default" value, I'll suggest a different approach.
code :
function Log {
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline=$true, ValueFromRemainingArguments=$true)]
        [AllowNull()]
        [AllowEmptyString()]
        [AllowEmptyCollection()]
        [string[]]$messages,

        [System.ConsoleColor]$color
    )

    if (($messages -eq $null) -or ($messages.Length -eq 0)) {
        $messages = @("")
    }

    foreach ($msg in $messages) {
        if ($color) {
            Write-Host $msg -ForegroundColor $color
        } else {
            Write-Host $msg
        }
        $msg | Out-File $logFile -Append
    }
}
function Log {
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline=$true, ValueFromRemainingArguments=$true)]
        [AllowNull()]
        [AllowEmptyString()]
        [AllowEmptyCollection()]
        [string[]]$messages,

        [System.ConsoleColor]$color
    )

    $params = @{}
    if ($color) {
        $params.ForegroundColor = $color
    }

    if (($messages -eq $null) -or ($messages.Length -eq 0)) {
        $messages = @("")
    }

    foreach ($msg in $messages) {
        Write-Host $msg @params

        $msg | Out-File $logFile -Append
    }
}
Powershell function with Try...Catch not making it into the function, because the parameter causes an error

Powershell function with Try...Catch not making it into the function, because the parameter causes an error


By : user2870158
Date : March 29 2020, 07:55 AM
With these it helps If you are just looking to see if the command exists, you should use Get-Command like @DimplesMcGibble suggested. If you are trying to execute the command, you can pass the command name as a string and use the invoke-operator
code :
function Test-Success ($cmdlet){
    try{
          & $cmdlet
          "Y"
    } catch {
          "Err -- Perform manually."
    }
}

Test-Success 'Get-DistributionList'
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