Azure AI Document Intelligence
An Azure service that turns documents into usable data. Previously known as Azure Form Recognizer.
Getting Method not found: in Azure.AI.FormRecognizer.DocumentAnalysis.DocumentAnalysisClient constructor
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Brian ONeil
0
Reputation points
I am trying to instance this class from a Functions app loading it downstream from a Plugin loaded assembly. So our code is calling Nuget to load a business assembly which references Azure.AI.FormRecognizer 4.1.0, and then that code tries to engage Azure AI for document classification and analysis. As soon as the code tries to get a new instance of the client, it throws that exception. I have tried using reflection to list all related assembly versions and locations at runtime, and everything is present and matching version numbers between the business logic assembly and the functions app host project.
Whether I have a reference to the AI package in the functions app or not, the same error keeps happening. I have also tried upgrading to the newer Azure AI DocumentIntelligence library from Nuget, and the same problem persists.
Thanks
Azure AI Document Intelligence
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Sridhar M 2,675 Reputation points Microsoft External Staff Moderator2025-12-05T19:33:59.6866667+00:00 Hi Brian ONeil
The issue you are encountering with the
DocumentAnalysisClientconstructor throwing a "Method not found" exception may be related to the way assemblies are being loaded in your Azure Functions app. Here are some steps you can take to troubleshoot and resolve the issue:- Ensure All Dependencies Are Present: Make sure that all dependencies required by
Azure.AI.FormRecognizerare correctly referenced and available at runtime. This includes checking for any transitive dependencies that might be missing. - Check for Version Conflicts: Since you mentioned using reflection to check assembly versions, ensure that there are no conflicting versions of
Azure.AI.FormRecognizeror its dependencies in your project. Sometimes, different versions can lead to runtime issues. - Use the Correct Constructor: Ensure that you are using the correct constructor for
DocumentAnalysisClient. The available constructors include:-
DocumentAnalysisClient(Uri endpoint, AzureKeyCredential credential) -
DocumentAnalysisClient(Uri endpoint, AzureKeyCredential credential, DocumentAnalysisClientOptions options) -
DocumentAnalysisClient(Uri endpoint, TokenCredential credential, DocumentAnalysisClientOptions options)Make sure you are passing the correct parameters as required by the constructor you are using.
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- Code Stripping in Unity: If you are using Unity, be aware that code stripping can remove necessary dependencies. You may need to configure Unity's linker settings to preserve the required assemblies. Adding a
link.xmlfile as mentioned in the context could help resolve this issue. - Upgrade to the Latest Version: If you haven't already, consider upgrading to the latest version of the Azure AI libraries. Sometimes, issues are resolved in newer releases
Reference:
- DocumentAnalysisClient Class - Definition
- DocumentAnalysisClient Constructors
- Troubleshooting Azure Document Intelligence
I Hope this helps. Do let me know if you have any further queries.
Thank you!
- Ensure All Dependencies Are Present: Make sure that all dependencies required by
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