asp.net mvc 5 - Json Error With [DisplayFormat(ConvertEmptyStringToNull = false)] -


i write mvc5 project in vs2013

a method in controller returns json

public jsonresult queryconcens(concentratorview concenforquery) {     queryconcentratorsrequest request = new queryconcentratorsrequest() { concenquery = concenforquery };      return         json         (             concenstratorservice             .queryconcentrators(request)             .concensview         ); }

the model 

public class concentratorview {     [required(errormessage="please input id")]     public string concentratorid { get; set; }      public string name { get; set; }      public string address { get; set; } }

it returns:

[{"concentratorid":"43","name":"345","address":"345"}, {"concentratorid":"56","name":"","address":null}, {"concentratorid":"concen_123","name":"wer","address":null}]

i want address:null ""

then add 

[displayformat(convertemptystringtonull = false)] public string address { get; set; }

but returns

[{"concentratorid":"43","name":"345","address":"345"}]

it losts 2 rows

why?


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