Custom Activity: Collection as Input Argument

I am creating a custom activity, and I want one of the input arguments - a dictionary - to appear in Studio the same way that the ItemInformation argument of Add queue item appears, that is, with a pop-up window that allows the developer to add a variable number of elements that goes into the input collection. How is this achieved?

Snap shot of desired functionality:

Code example that does not work:

1 Like

@TDagsvik did you found a solution for this issue? I also developed custom activity but I am struggling to define collection input parameters. Thanks a lot.

Unfortunately not. Please let me know if you find a solution!

Hi. Please have a look at:

These posts helped me to find the solution.


Hi, do you have a solution for this, because in my case I am able to see only disabled “Collection” and not able to open the Argument input box. See my post:

Same issue for me.
Did you figure this out?

I discovered that we have to open the tool/dialog window and then we can add edit the records just in a grid format. Although, I didn’t implemented the solution if given the chance I can definitely do it.


Cool, thanks Deepak!

If you do so, It would be great if you could share an example!

Best regards

Sure, I will share as soon as I do this

Is there an official or unofficial sample for this? I also I am not able to use either collection or dictionary arguments in the designer.

Any solution?

Hi All,

Is there any solution for this