Joining output with comma

[basigu]

I have an array of objects and object as a property 'Arrangement' and I would like to return all the unique values of this property. What is the best way to do this. Currently, I have the following code which is not working.
"Actions": {
"OnSuccess": {
"Name": "OutputExpression",
"Context": {
"Expression": "string.Join(',', input1Select(Arrangement).Distinct())"
}
}
}

[abbasc52]

I see a c# expression issue here . string.Join accepts string as first parameter. So the expression should be string.Join(\",\", input1Select(Arrangement).Distinct())

Also based on the type of Arrangement, you might want to do .toString() to ensure it has correct type.
e.g. string.Join(\",\", input1Select(Arrangement.toString()).Distinct())

Here is a working example for the above scenario - https://dotnetfiddle.net/hUTRf1

[basigu]

Thank you abbasc52!