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How to access the D365FO's tables in the C# project?

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Posted on by Yue Zhen

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Hi experts,

I am trying to write some C# API that will integrate with Dynamics 365 Finance and Operations. I would like to use the D365FO tables in the C Sharp code. However, I get the error stating that /The type or namespace name 'ads_EInvoiceParameters' could not be found (are you missing a using directive or an assembly reference)/. Hence, I would like to know what assembly I should add in order to use the Dynamics 365 FnO tables in the C# code.

I really appreciate to any guidance and answer provided.

Thank you.

Best regards,

Yue Zhen

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Martin Dráb 238,734 Most Valuable Professional on at

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Please tell us more about the application you're trying to build.

For example, if you're developing a web application that will communicate with F&O, you call F&O web service endpoints, e.g. the OData service. Another approach is going through Dataverse (virtual entities).

What language you'll use isn't very important for these decisions about architecture.

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Waed Ayyad 9,061 Super User 2026 Season 1 on at

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Hi,

Do you want to integrate with D365 FO then you should use one of D365 FO integrations like OData API calls:

Check the below link, it maybe helps you:

https://jatomas.com/en/2023/01/03/consume-dynamics-365-fo-data-entities-cs/

Thanks,

Waed Ayyad

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Layan Jwei 8,165 Super User 2026 Season 1 on at

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Hi Yue,

What are you trying to do with those tables once you have access to them in C#? Do you want to get data from those tables? then there are integration methods provided by Microsoft to do that. So we need to understand what you are trying to do in order to help you.

But here are some links about c# and D365 (not sure if they will help)
https://learn.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/dev-tools/write-business-logic
https://community.dynamics.com/blogs/post/?postid=88f9ae7c-bd65-4ed4-9ef5-aec698c58f85

Thanks,
Layan Jweihan
Please mark this answer as "Verified" if it solved your issue. In order to help others who will face a similar issue in the future

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Yue Zhen 147 on at

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Hi all,

I am sorry for my late response.

What I am actually trying to do is I am trying to write the code to retrieve the invoice data from FnO, then submit it to our government through the API.

The file that will be submitted to government must be in XML format. So, I was asked to use UblSharp to generate the XML.

Thank you.

Best regards,

Yue Zhen

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Martin Dráb 238,734 Most Valuable Professional on at

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Then I suggest using OData (you can generate C# classes from OData metadata and work with the data in an object-oriented manner, or going through Dataverse (see Work with data using code in Microsoft Dataverse).

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