c# - How to serialize an integer element with no value? -


i have xml element looks this:

<framerate_denominator nil="true"/>

my class member decorated this:

[xmlelement("framerate_denominator")] public int? frameratedenominator;  public bool shouldserializeframeratedenominator() { return frameratedenominator.hasvalue; }

my code follows:

using serialization; using system.io; using system.xml.serialization;  namespace serializationsandbox {     class program     {         static void main(string[] args)         {             // read             job job = null;             string path = @"c:\sample_job.xml";              xmlserializer xmlserializer = new xmlserializer(typeof(job));             using (streamreader reader = new streamreader(path))             {                 //exception here                 job = (job)xmlserializer.deserialize(reader);                 reader.close();             }              // write             xmlserializer = new xmlserializer(job.gettype());             using (stringwriter textwriter = new stringwriter())             {                 xmlserializer.serialize(textwriter, job);                 var text = textwriter.tostring();             }         }     } }

i'm getting following exception when deserialize xml:

formatexception: input string not in correct format.

i'm not entirely sure how can handle these elements nil="true"attribute value. have advice?

thanks in advance...

as check similar questions , answer can suggest change frameratedenominator of job class : 

[xmlelement("framerate_denominator")] public string _frameratedenominator { get; set; }  [xmlignore] public int? frameratedenominator     => !string.isnullorempty(_frameratedenominator)          ? (int?) int.parse(_frameratedenominator)          : null;

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