CODEWITHSUNDEEP
c#powershell
tyteen4a03
tyteen4a03

Reputation: 1932

Passing an foreachable array from C# to PowerShell

How can I pass an array from C# to PowerShell that can be foreached?

Right now I have this script:

[Cmdlet(VerbsCommon.Get, "Numbers")]
public class GetNumbersCmdlet: Cmdlet
{
    protected override void BeginProcessing()
    {
        var list = new List<string>();
        list.Add("1");
        list.Add("2");
        list.Add("3");
        list.Add("4");
        list.Add("5");
        WriteObject(results.ToArray());
    }
}

And this PowerShell script:

foreach ($number in Get-Numbers) {
    Write-Output "Output is $number"
}

Instead of:

Output is 1
Output is 2
Output is 3
Output is 4
Output is 5

I would get:

Output is 1 2 3 4 5

Upvotes: 1

Views: 474

Answers (1)

user4003407
user4003407

Reputation: 22122

PowerShell do not automatically enumerate output of commands. That means if command write collection into pipeline, then that collection will be passed to the next command as single object.

WriteObject also do not enumerate objects unless explicitly asked.

So to solve your problem, you can write objects as you go instead of collecting them:

[Cmdlet(VerbsCommon.Get, "Numbers")]
public class GetNumbersCmdlet: Cmdlet
{
    protected override void BeginProcessing()
    {
        WriteObject("1");
        WriteObject("2");
        WriteObject("3");
        WriteObject("4");
        WriteObject("5");
    }
}

Or you can ask WriteObject to enumerate your collection:

[Cmdlet(VerbsCommon.Get, "Numbers")]
public class GetNumbersCmdlet: Cmdlet
{
    protected override void BeginProcessing()
    {
        var list = new List<string>();
        list.Add("1");
        list.Add("2");
        list.Add("3");
        list.Add("4");
        list.Add("5");
        WriteObject(results, true);
    }
}

Note that in both cases you are not writing array anymore, but individual items of it.

Upvotes: 1

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