Set selected options from optionset on Contact using Web API

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Posted on by Marco Voorwinden

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:

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!

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Marco Voorwinden 5 on at

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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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