Cannot run Template code for Azure Functions

TimEichfeld 20

Hello,

I am looking over the https://learn.microsoft.com/en-us/training/modules/develop-test-deploy-azure-functions-with-visual-studio/2-develop-and-test-azure-functions-locally . On 'Unit2' where the learning module goes through VS2022 to load and run Azure Functions, the Blob Trigger is broken.

I go through the wizard, choose to use the Azurite WebStorage emulator (in memory) add a test secret and click finish.

Everything seems to load, however the Azure Function tool templates are incomplete and do not load in the proper nuget packages for BlobTrigger Attribute support. When I install the recommended package 'MicrosoftAzure.WebJobs.Extensions.Storage' it will not install because it wants to downgrade dependent components in the Azure Functions app. If I manually update all of my out of date nuget packages, I can install MicrosoftAzure.WebJobs.Extensions.Storage v5.3.3 (and all dependencies) but I get runtime errors.

[2025-01-22T19:50:58.628Z] A host error has occurred during startup operation 'caa2b9bc-d6d4-4fbd-851c-fa85cfdb1d0d'.

[2025-01-22T19:50:58.630Z] System.Private.CoreLib: Exception has been thrown by the target of an invocation. Microsoft.Azure.WebJobs.Extensions.Storage.Queues: Could not load file or assembly 'System.Memory.Data, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

Value cannot be null. (Parameter 'provider')

Press any key to continue....[2025-01-22T19:51:00.495Z] A host error has occurred during startup operation 'cab9528b-ca67-487b-9518-042c35971eb3'.

...

I even tried installing System.Memory.Data v6.0.0 - (and latest) but that still gives the exact same error.

How can I test these types of functions locally?
Is the Azurite emulator no longer supported?
Please advise.

Thanks much,

-Timothy

1 answer

Pradeep M 5,435 Reputation points Microsoft Vendor

2025-01-23T04:50:27.9133333+00:00

Hi TimEichfeld,

Thank you for reaching out to Microsoft Q & A forum.

To resolve your issue, please follow these steps:

1.Update Visual Studio 2022 to the latest version via the Visual Studio Installer.

2.Use the installer to modify Visual Studio, ensuring ASP.NET and web development and Azure development workloads are installed.

3.Create a new Azure Functions project and select .NET 8.0 Isolated (Long Term Support) as the runtime version.

4.Follow the exercise steps carefully to configure and test your function.

5.Screenshots have been provided for your reference:

6.Note: The exercise originally mentions .NET 6.0 (Long Term Support) but might be updated in the future to .NET 8.0 for enhanced clarity and user experience.

Please feel free to contact us if you have any additional questions.

If you have found the answer provided to be helpful, please click on the "Accept answer/Upvote" button so that it is useful for other members in the Microsoft Q&A community.
Please sign in to rate this answer.
TimEichfeld 20 Reputation points

2025-01-23T13:30:56.2766667+00:00

HI Pradeep,
I made sure all nuget packeges are latest stable. However, I still got the above errors. If you go through the module, the Http Trigger works (local development), but the Blob Trigger (and im assuming everything that depends on the emulated storage) does not work. Note: I do not have an Azure account referenced for my development/training scenario, I am trying to perform all of these functions locally in a dev environment.

If you or one of your team can go through the steps, and then attempt to run the 'Blob Trigger' example, you should reproduce the error I am seeing.

Please advise.

Thanks much,

-Timothy

TimEichfeld 20 Reputation points

2025-01-24T20:51:10.0033333+00:00

HI Pradeep,

Template code will still not run. This is a bug in the runtime somewhere. I will need to file an issue with Microsoft.Azure.WebJobs.Extensions.Storage.Queues .net 8.0

If you try to run the Azure template for stand-alone creation of a Blob Storage AppFunction using the azurite emulator, you would get the same thing.

Thansk much,

-Timothy

TimEichfeld 20 Reputation points

2025-01-24T20:53:20.2766667+00:00

Actually, if you could point me to the correct team (or github project address) to file this, that would be most helpful :)

Thanks much,

-Timothy

TimEichfeld 20 Reputation points

2025-01-24T21:58:13.8533333+00:00

HI Pradeep,

It is not a problem with the versions I am using.
Template code will still not run. There is a bug in the runtime somewhere. I will need to file an issue with Microsoft.Azure.WebJobs.Extensions.Storage.Queues .net 8.0

If you try to run the Azure template for stand-alone creation of a Blob Storage AppFunction using the azurite emulator, you would get the same thing.

If you could point me to the correct team (or github project address) to file this, that would be most helpful :)

Thanks much,

-Timothy

Pradeep M 5,435 Reputation points Microsoft Vendor

2025-01-27T03:29:57.9433333+00:00

Hi TimEichfeld,

Could you share the error details and include screenshots? This will help me provide a more accurate response.

TimEichfeld 20 Reputation points

2025-01-27T14:15:59.1133333+00:00

Hi Pradeep,

This is simply trying to run the template code for "Blob Trigger" in Visual Studio 2022.
[VS Version 17.11.0 (.Net Framework 4.8.09037)]

Project Target Framework: .Net 8.0

-=-=-=-

AzTest FunctionBlob:
Project uses the Azure Template "Azure Functions" Azure Function Project.

.Net8.0 (long term support)
Checked "Use Azurite for Runtime storage account (AzureWebJobsStorage)
Function: "Blob Trigger"
Connection string name : "AzTest1"
Path: "samples-workitems"
When the popup to choose the storage option appears - Storage Azurite Emulator (local) with pre-filled storage options.
-=-=-=-
I made sure all NuGet packges are updated to latest stable.
I tried updating to the System.Memory.Data 9.0.1 that did not work.
I tried down grading back to the 6.0.0 (error complaint) that did not work.
-=-=-=-
Not sure what else to do, this is purely template code that is supposed to work out of the box.

Thanks much,

-Timothy

Pradeep M 5,435 Reputation points Microsoft Vendor

2025-01-29T05:40:19.2433333+00:00

Hi TimEichfeld,

I'm following up to see if you've had a chance to review my revised answer. If it was helpful, please let me know by accepting the answer and upvoting it. Feel free to reach out if you encounter any issues.

Thank you.

TimEichfeld 20 Reputation points

2025-01-29T15:35:12.5233333+00:00

Hi Pradeep,

Yes, the HTTP trigger works, as you have shown in your example and I had mentioned. It is the "Blob Trigger" that is not working. All of the various options should work, correct? Also: If it works in .net 6.0, it will work in .net 8.0 (this is .net ;) ). Please try using the blob trigger ?

Please advise.

Pradeep M 5,435 Reputation points Microsoft Vendor

2025-01-30T08:56:55.5033333+00:00

Hi TimEichfeld,
Apologies for the confusion, and thank you for your patience and understanding. The issue you're encountering with the Blob Trigger may be due to a mismatch in template configurations. Please ensure that you have selected the correct Blob Trigger template when creating your Azure Function, and that your local Azurite emulator is properly configured. Additionally, verify that the necessary packages, such as Microsoft.Azure.WebJobs.Extensions.Storage, are installed and compatible with your .NET version. For more details, you can refer to the Blob Trigger template documentation.

TimEichfeld 20 Reputation points

2025-01-30T20:45:04.2833333+00:00

Hi Pradeep,

No Problem. Looking over:
https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob-trigger?tabs=python-v2%2Cin-process%2Cnodejs-v4%2Cextensionv5&pivots=programming-language-csharp

and
https://learn.microsoft.com/en-us/azure/storage/common/storage-use-azurite?tabs=visual-studio%2Cblob-storage#running-azurite-from-an-azure-functions-project

I still cannot get this to work.

The built-in template in VS2022 uses the in-process model - (I saw that was being deprecated). However: I have all of the required packages installed by default and set up everything according to the template which attempts to install dependencies when the project is being built.

Please try to get the StorageConnection working in VS 2022 for local development using Azurite Emulator, Im sure you would feel the same pain I do. Maybe you will have better insight to a fix to help me understand what is missing?

-=-=-
In Example:
I set up a new AppFunction project, taking all defaults for BlobStorage, setting up the Azurite Emulator and connection and having the VS template install all dependencies. When the project was ready, the 'BlobTrigger' is banged out. I tried to install the lastest WebExtension.Storage - using intellisense -> find and install latest stable <- Followed all steps, and it did not work. I have to update all Nuget packages (in order) then install the latest WebStorage component.

The built-in project template for Blob Storage (and probably everything that needs WeStorage) is pretty broken out of the box, and takes hand-wringing to get it to build.

Once I get it building and the azurite emulator running, and everything looks good in the 'Connected Services'; the Function App fails with the error listed above. The Host (Azurite) has a bad reference to System.Memory.Data.

Currently, I have not found a clear way to test Storage FunctionApps locally before publishing. It does not give me confidence that this will work once published.

Is there a magic workaround to get this working to test WebStorage functions locally?

If not: where can I file a bug to the proper team to get this fixed? If there is a way to simply attach this thread to bring it to the attention of the proper team, that would be much appreciated.

Please advise.

Thanks much,

-Timothy

Pradeep M 5,435 Reputation points Microsoft Vendor

2025-01-31T11:09:38.2833333+00:00

Hi TimEichfeld,

Thank you for your patience. To resolve the issue with the Blob Trigger in your local development environment, please follow these steps:

1.Ensure that Azurite is updated to the latest version.

2.Confirm that your local.settings.json file is correctly configured with the following: "AzureWebJobsStorage": "UseDevelopmentStorage=true".

3.Uninstall and then reinstall the Microsoft.Azure.WebJobs.Extensions.Storage package. Make sure to clear the bin and obj folders before restoring dependencies.

4.If the Azurite emulator continues to cause issues, consider testing with a real Azure Storage account to eliminate potential local emulator problems.

5.If you are encountering errors related to System.Memory.Data, try adjusting the package versions or consider using the isolated worker model to prevent dependency conflicts.

6.Should the issue persist, I recommend filing a bug on the Azure Functions GitHub for further investigation by the team.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Share via

Cannot run Template code for Azure Functions

1 answer

Your answer