Windows Phone 8 Can't Update listbox item in XML file after using hardware back button? -


hi have list box , saving list box selected item in xml file thats working fine problem when close app , reopen , add more value list box previous value removed form xml file , listbox how can save current added value , previous value in xml file using following code :

and iam using following code 

<grid x:name="contentpanel" grid.row="2" margin="15,10,15,0">     <listbox name="list_location" tap="list_location_tap"  foreground="black">         <listbox.itemtemplate>             <datatemplate>                 <textblock x:name="item_name" text="{binding description, mode=oneway}" padding="5,15,5,15" textwrapping="wrap" fontsize="{staticresource phonefontsizelarge}"/>             </datatemplate>         </listbox.itemtemplate>     </listbox>      <listbox name="list_locationadd" background="red"  foreground="black" visibility="collapsed">         <listbox.itemtemplate>             <datatemplate>                 <textblock x:name="item_name" text="{binding description, mode=oneway}" padding="5,15,5,15" textwrapping="wrap" fontsize="{staticresource phonefontsizelarge}"/>             </datatemplate>         </listbox.itemtemplate>     </listbox> </grid>

and end code follow:

 xmlwritersettings x_w_settings = new xmlwritersettings();  x_w_settings.indent = true;  using (isolatedstoragefile isf = isolatedstoragefile.getuserstoreforapplication())  {      using (isolatedstoragefilestream stream = isf.openfile(filename, filemode.create))      {          xmlserializer serializer = new xmlserializer(typeof(observablecollection<prediction>));          using (xmlwriter xmlwriter = xmlwriter.create(stream, x_w_settings))          {                                                      data.add(new prediction() { description = app.professionalid });              list_locationadd.itemssource = data;              serializer.serialize(xmlwriter, data);          }      }  }   protected override void onnavigatedto(navigationeventargs e)     {         try         {             if (list_locationadd != null)             {                 using (isolatedstoragefile isf = isolatedstoragefile.getuserstoreforapplication())                 {                     using (isolatedstoragefilestream str = isf.openfile(filename, filemode.open))                     {                         xmlserializer serializer = new xmlserializer(typeof(observablecollection<prediction>));                         observablecollection<prediction> data = (observablecollection<prediction>)serializer.deserialize(str);                         if (list_locationadd != null)                         {                             this.list_locationadd.itemssource = data;                             list_locationadd.visibility = visibility.visible;                         }                                                 }                 }             }         }         catch (exception ex)         {          }               }

change in code per below :

using (isolatedstoragefile isf = isolatedstoragefile.getuserstoreforapplication())  {      using (isolatedstoragefilestream stream = isf.openfile(filename, filemode.create))      {          xmlserializer serializer = new xmlserializer(typeof(observablecollection<prediction>));          using (xmlwriter xmlwriter = xmlwriter.create(stream, x_w_settings))          {                                                      data.add(new prediction() { description = app.professionalid });              list_locationadd.itemssource = data;              serializer.serialize(xmlwriter, data);          }  }

update in current code :

isolatedstoragefile isostore = isolatedstoragefile.getstore(isolatedstoragescope.user | isolatedstoragescope.assembly, null, null); if (isostore.fileexists(filename)) {            try     {                    using (isolatedstoragefilestream isostream = new isolatedstoragefilestream(filename, system.io.filemode.open, system.io.fileaccess.read, isostore))         {             xmlserializer serializer = new xmlserializer(typeof(observablecollection<prediction>));             observablecollection<prediction> data = (observablecollection<prediction>)serializer.deserialize(isostream);             this.list_locationadd.itemssource = data;         }     }     catch(exception ex)      { } } else {     try     {            using (isolatedstoragefilestream isostream = new isolatedstoragefilestream(filename, filemode.create, isostore))         {             xmlserializer serialize = new xmlserializer(typeof(observablecollection<prediction>));             using (xmlwriter writer = xmlwriter.create(isostream, x_w_settings))             {                 data.add(new prediction() { description = app.professionalid });                 list_locationadd.itemssource = data;                 serialize.serialize(writer, data);             }         }     }     catch (exception ex)     { } }

hope helpful you.


Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more