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AutoRest- Duplicate operation detected

I was trying to use AutoRest to generate a client SDK for one of my API’s. This turned out not to be the success I was hoping for.

Yesterday I explained that I got into trouble because an OperationId was missing. But after adding it, it still didn’t work. Instead I got the following error message:

Duplicate operation detected

Here was the API controller I was using:

AutoRest uses the OpenAPI generated through Swashbuckle. When I took  a look at the OpenAPI file, I noticed that indeed the same OperationId was used:

This is because I was using the ActionName as the OperationId. As I have multiple Action methods with the same name they all result in the same OperationIe

To fix it, you can do 2 things:

  • Using the [SwaggerOperation] attribute
  • Using the Name property on the Http attribute ([HttpGet], [HttpPost],…)

Using the [SwaggerOperation] attribute

By adding a [SwaggerOperation] attribute to the controller action method, you can control the generated OperationId:

Using the Name property

An alternative solution is to use the Name property on the HTTP routing attributes:

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