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Set selected options from optionset on Contact using Web API

Posted on by 5

Hi all,

On the Contact record we have a custom field where users can select multiple options from an option set. Using the GUI this works. Using Postman that works also:

pastedimage1681205144686v1.png

But, now I try to do the same from C# code using the UpdateAsync method of the ServiceClient, but I always get an error: 'Incorrect attribute value type <the type I specify>'.

The things I tried:

  • a string with comma-separated values from the option set. 
  • an array of strings
  • an array of integers
  • a object of type MultiSelectPicklistAttributeMetadata

Anyone can help me how to do this?

Thanks in advance!

  • Suggested answer
    RE: Set selected options from optionset on Contact using Web API

    Okay, had been searching for a solution for a day already, and just some minutes after posting this question I found the answer. If anyone is interested: you have to use an OptionSetValueCollection where you specify all the options you want to be selected.

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