The JSON outcome lacks a constructor that supports 0 arguments

While trying to create my JSON action, I ran into an issue.

The problem lies in the fact that when I try to return a JsonResult, it is being flagged with an error message stating 'JSON result does not contain a constructor that takes 0 arguments'. I am unsure of how to resolve this issue.

public JsonResult GetEventInfo(MVCEventCalendarContext context)
        {
            var events = context.EventInfo.ToList();
            return new JsonResult();
        }

Answer №1

When using JsonResult, make sure that the value of your output is being converted to JSON correctly and that you are providing something to output.

If you want to return the events to the caller, simply pass the events variable into the JsonResult() function like this:

return new JsonResult(events);

Also, when serializing a collection to JSON, consider using .ToArray() instead of .ToList() for faster processing if it's the final output desired.

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