json.net - How to update JSON data object in the isolated storage of my Windows Phone 8 application -

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i have listpicker item contain list of expense.
on clicking it, new xaml page opened , details of expense obtained.
there option edit , save.

so how should update particular json data object stored in isolated storage when user clicks update button.

my code here:

https://onedrive.live.com/redir?resid=83f2a501543779d4%211229

thank you

here code in updatexpenses.xaml.cs. please let me know going wrong.

after navigation page

protected override void onnavigatedto(system.windows.navigation.navigationeventargs e){

        base.onnavigatedto(e);         string datafromappsettings;         expencesgroup data;          navigationcontext.querystring.trygetvalue("selectedexpenceobject", out selectedindex);         navigationcontext.querystring.trygetvalue("typeoftransaction", out transactiontype);         if (transactiontype == expencesmodel.expencesgivenkey)         {             if (isolatedstoragesettings.applicationsettings.trygetvalue(expencesmodel.expencesgivenkey, out datafromappsettings))             {                 data = jsonconvert.deserializeobject<expencesgroup>(datafromappsettings);                  if (data != null) {                     thisexpence = data.expences[convert.toint32(selectedindex)];                     this.datacontext = thisexpence;                     switchbetweenlistitems(thisexpence.typeoftransaction);                     switchbetweenlistitems(thisexpence.paidthrough);                 }             }         }           else         {             if (isolatedstoragesettings.applicationsettings.trygetvalue(expencesmodel.expencestakenkey, out datafromappsettings))             {                 data = jsonconvert.deserializeobject<expencesgroup>(datafromappsettings);                 if (data != null) {                     thisexpence = data.expences[convert.toint32(selectedindex)];                     this.datacontext = thisexpence;                     switchbetweenlistitems(thisexpence.typeoftransaction);                     switchbetweenlistitems(thisexpence.paidthrough);                  }             }         }

after clicking update button

    private void update_expense(object sender, system.windows.input.gestureeventargs e)     {         thisexpence.amount = amount.text;         messagebox.show(thisexpence.amount.tostring());         thisexpence.expensetitle = expensename.text;         listpickeritem paidthroughlistpicker = (listpickeritem)paidthrough.selecteditem;         thisexpence.paidthrough = (string)paidthroughlistpicker.content;         thisexpence.expencestatus = (bool)paymentstatus.ischecked;         listpickeritem listpickeritem = (listpickeritem)typeoftransaction.selecteditem;         thisexpence.typeoftransaction = (string)listpickeritem.content;         if (thisexpence.typeoftransaction == expencesmodel.expencesgivenkey)         {             var data = jsonconvert.serializeobject(app.viewmodel.given);             isolatedstoragesettings.applicationsettings[expencesmodel.expencesgivenkey] = data;         }         else         {             var data = jsonconvert.serializeobject(app.viewmodel.taken);             isolatedstoragesettings.applicationsettings[expencesmodel.expencestakenkey]. = data;         }         isolatedstoragesettings.applicationsettings.save();         navigationservice.navigate(new uri("/expencespage.xaml", urikind.relativeorabsolute));     }

step 1: can read json data object isolatedstorage , convert datacontract using datacontractjsonserializer. can update particular value on button click.

step 2: convert datacontract stream or json data object , store isolatedstorage.

you can refer this link step 1. refer how to: serialize , deserialize json data also


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