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I want to retrieve a record with a where condition , I know this query will return me a single record.
I know how to do it using Query Expression and the service.RetrieveMultiple .
Is there any way I can add a filter condition with service.Retrieve too?
If no , then is using service.RetrieveMultiple the most accurate way for writing such a query.
You cannot specify condition for service.Retrieve as it retrieves record based on the ID (GUID) you provided so it does not need any condition.
If you are retrieving by conditions and filters (meaning you do not know the ID of the record at that point in time), and yes you have to use service.RetrieveMultiple even if you are expecting only one record.
Please note that If your query is going to run from outside of CRM, Web Api is recommended over WCF endpoint
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