I would like to throw an exception when an ASP.NET WebAPI function returns JSON where the value is an IEnumerable and the HTTP request method is GET - hopefully to stop any JSON being generated where the top level is an array .
I've tried to do this by creating a MediaTypeFormatter. Am I able to do this? Is there another way I can go about doing this? Thanks.
Something like:
public class CustomFormatter : MediaTypeFormatter
{
public override Task WriteToStreamAsync(Type type, object value, Stream stream, HttpContentHeaders contentHeaders, TransportContext transportContext)
{
// Retrieve value for isGetRequest somehow...
if (value is IEnumerable && isGetRequest)
{
throw new InvalidOperationException();
}
...
}
}
It is possible as GetPerRequestFormatterInstance
method has been added and can be overriden:
public class CustomFormatter : MediaTypeFormatter
{
private HttpRequestMessage _request;
private CustomFormatter(HttpRequestMessage request)
{
_request = request;
}
public override MediaTypeFormatter GetPerRequestFormatterInstance(Type type, HttpRequestMessage request, MediaTypeHeaderValue mediaType)
{
return new CustomFormatter(request);
}
..........
So if you do that, then at the time of WriteToStreamAsync
, request will have a value.
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