c# - I can not get MVVM to work -

-

i desperately trying implement mvvm , reason not working. using mvvm light on windows 8.1 store app.

what doing wrong? followed 3 tutorials , nothing seems work..

i retrieve data webservice , part 100% works fine. observablecollection contains data.

the rest of code looks this:

viewmodellocator:

public viewmodellocator() {     servicelocator.setlocatorprovider(() => simpleioc.default);      if (viewmodelbase.isindesignmodestatic)     {         // create design time view services , models         simpleioc.default.register<idesigntimeweatherservicelayer, designtimeweatherservicelayer>();     }     else     {         // create run time view services , models         simpleioc.default.register<iweatherservicelayer, weatherservicelayer>();     }      simpleioc.default.register<weatherviewmodel>(); }   public weatherviewmodel weather {         {         return servicelocator.current.getinstance<weatherviewmodel>();     } }

viewmodel:

public class weatherviewmodel : viewmodelbase {     weatherservicelayer servicelayer = new weatherservicelayer();      public async void getallweatherdata()     {         weatherdata = await servicelayer.getallweatherasync();     }      private observablecollection<weather> weatherdata;     public observablecollection<weather> weatherdata { { return weatherdata; } set { weatherdata = value; raisepropertychanged("weatherdata"); } } }

code behind:

public mainpage() {     this.initializecomponent();     weatherviewmodel vm = new weatherviewmodel();     vm.getallweatherdata(); }

view:

... datacontext="{binding weather, source={staticresource locator}}">  <grid background="{themeresource applicationpagebackgroundthemebrush}">     <gridview itemtemplate="{staticresource weatheritemtemplate}" itemssource="{binding weather.weatherdata, source={staticresource locator}}"/> </grid>

datatemplate:

<datatemplate x:key="weatheritemtemplate">     <stackpanel>         <textblock text="{binding temperature}" height="60" margin="15,0,15,0"/>         <textblock text="{binding weekday}" margin="15,0,15,10"/>     </stackpanel> </datatemplate>

i'm not sure there couple things seem suspect me. set datacontext property. sure datacontext you're expecting after assignment? can set breakpoint in view's constructor after call initializecomponent check.

further in itemssource binding you're saying "weather.weatherdata" sourced locator. seems redundant , maybe wrong. maybe try "weatherdata" , remove source specification. if datacontext weather, object used bindings in xaml file.


Comments

Post a Comment

Popular posts from this blog

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null
Read more

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops',
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens
Read more