public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable <MediaTypeFormatter> formatters)
{
ContentNegotiationResult result = null;
_traceWriter.TraceBeginEnd(
request,
TraceCategories.FormattingCategory,
TraceLevel.Info,
_innerNegotiator.GetType().Name,
NegotiateMethodName,
beginTrace: (tr) =>
{
tr.Message = Error.Format(
SRResources.TraceNegotiateFormatter,
type.Name,
FormattingUtilities.FormattersToString(formatters));
},
execute: () =>
{
result = _innerNegotiator.Negotiate(type, request, formatters);
},
endTrace: (tr) =>
{
tr.Message = Error.Format(
SRResources.TraceSelectedFormatter,
result == null
? SRResources.TraceNoneObjectMessage
: MediaTypeFormatterTracer.ActualMediaTypeFormatter(result.Formatter).GetType().Name,
result == null || result.MediaType == null
? SRResources.TraceNoneObjectMessage
: result.MediaType.ToString());
},
errorTrace: null);
if (result != null)
{
result.Formatter = MediaTypeFormatterTracer.CreateTracer(result.Formatter, _traceWriter, request);
}
return(result);
}