swagger .net core API ambiguous HTTP Action debugging

This can occur when a method is declared public in a controller, but without REST attributes. Changing the method to protected may address the issue.

I have seen this error before and usually the errormessage points to the culprit: EBisAPI.Controllers._class.HandleError

I guess HandleError is a public method in your base class, right? Change it to protected and try again.

The Clean way could be using data annotation [NonAction] instead to set your method as protected.

I solved this error by decorating the method mentioned in the error with the correct HTTP attribute. For exemple: [HttpGet]

This code throws error:

public object Get()
{
    MongoDbContext dbContext = new MongoDbContext();
    return new {
        API = true,
        Database = dbContext.Status()
    };
}

This code works:

[HttpGet]
public object Get()
{
    MongoDbContext dbContext = new MongoDbContext();
    return new {
        API = true,
        Database = dbContext.Status()
    };
}