System.TypeLoadException: while using BlobClientOptions

Bonnie Mathew 1

I am trying to use Azure Blob Storage on Xamarin.iOS. In the following code I am getting an exception

This is the exception that I am getting.

Caught an exception = System.TypeLoadException: Type AuthTokenHttpPipelinePolicy has invalid vtable method slot 4 with method none

Can anybody help?

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 35,021 Reputation points Microsoft Vendor

2022-07-01T08:08:09.513+00:00

Referring to this documentation TypeLoadException Class, we could find the following content:

TypeLoadException is thrown when the common language runtime cannot find the assembly, the type within the assembly, or cannot load the type. The Message property contains more detailed information that can help you identify the cause of the exception.
TypeLoadException uses the HRESULT COR_E_TYPELOAD, that has the value 0x80131522.
For a list of initial property values for an instance of TypeLoadException, see the TypeLoadException constructors.
The exact timing of when statically referenced types are loaded is unspecified. This exception may be thrown before the method that references the missing type starts executing.

You could try to clean your bin/ and obj/ folders and rebuild your application.

If it doesn't work, could you please provide information about when this error occurs and how to reproduce it?

You could refer to this documentation: How to write a quality question.
Bonnie Mathew 1 Reputation point

2022-07-08T12:36:47.913+00:00
Deleting the bin/ and obj/ folders didn't work.

To give more details, the AuthTokenHttpPipelinePolicy is inherited from Azure.Core.Pipeline.HttpPipelinePolicy.

public class AuthTokenHttpPipelinePolicy : HttpPipelinePolicy { }

HttpPipelinePolicy is from Azure.Storage.Blobs nuget package ( version 12.12.0).

The Exception Message says - "Type AuthTokenHttpPipelinePolicy has invalid vtable method slot 4 with method none"

This library (containing the AuthTokenHttpPipelinePolicy) is compiled for .netStandard2.1 and eventually consumed in a Xamarin.iOS project.

Is Azure.Core.Pipeline.HttpPipelinePolicy fully supported on Xamarin.iOS?

Please see the image below for more details on the exception. I see 'System.NotImplementedException' in the Non-public members > IsTransient.

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