Pass a PowerShell array to a .NET function

Question

I want to get some 10 values of type short from a .NET function.

In C# it works like this:

Int16[] values = new Int16[10];
Control1.ReadValues(values);

The C# syntax is ReadValues(short[] values).

I tried something like this:

$Control1.ReadValues([array][int16]$Result)

But there are only zeroes in the array.

What do you mean by "But only zeroes in the array."? What is the value of $Result? — Mathias R. Jessen
– Mathias R. Jessen, Commented May 3, 2016 at 9:22
I'm also wondering how does it work in C# without return value, ref or out? — Andrey Marchuk
– Andrey Marchuk, Commented May 3, 2016 at 9:27
The ReadValues function returns 10 non zero values but the $Result array contain only zeroes. I guess that I do it totally wrong or maybe it is not possible? — user1187060
– user1187060, Commented May 3, 2016 at 9:28
Can you show us the definition of ReadValues() or tell us which type Control1 is? — Mathias R. Jessen
– Mathias R. Jessen, Commented May 3, 2016 at 9:31

Mathias R. Jessen · Accepted Answer · 2016-05-03 09:40:04Z

2

In the comments you mention:

I believe that the C# function have a ref

So, the method signature is really:

ReadValues(ref short[] values)

Luckily, PowerShell has a [ref] type accelerator for this sort of situation

# Start by creating an array of Int16, length 10
$Result = [int16[]]@( ,0 * 10 )

# Pass the variable reference with the [ref] keyword
$Control1.ReadValues([ref]$Result)

For more inforation, see the about_Ref help file

answered May 3, 2016 at 9:40

Mathias R. Jessen

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