wpf - mvvm - prismv2 - INotifyPropertyChanged -

-

since long , prolapsed , doesnt ask coherent question:

1: proper way implement subproperties of primary object in viewmodel?

2: has found way fix delegatecommand.raisecanexecutechanged issue? or need fix myself until ms does?

for rest of story...continue on.

in viewmodel have doctor object property tied model.doctor, ef poco object. have onpropertychanged("doctor") in setter such:

       private property doctor() model.doctor                             return _objdoctor             end             set(byval value model.doctor)                 _objdoctor = value                 onpropertychanged("doctor")             end set         end property

the time onpropertychanged fires if whole object changes. wouldnt problem except need know when properties of doctor changes, can enable other controls on form(save button example). have tried implement in way:

public property firstname() string                     return _objdoctor.firstname         end         set(byval value string)             _objdoctor.firstname = value             onpropertychanged("doctor")         end set     end property

this taken xamlpowertoys controls karl shifflet, have assume correct. life of me cant work.

i have included prism in here because using unity container instantiate view , singleton. getting change notification viewmodel via eventaggregator populates doctor new value. reason doing because of prism's delegatecommand. maybe real issue.

it appears there bug in delegatecommand not fire raisecanexecutechanged method on commands implement , therefore needs fired manually. have code in onpropertychangedeventhandler. of course isnt implemented through icommand interface either have break , make properties delegatecommand(of x) have access raisecanexecutechanged of each command.

2: has found way fix delegatecommand.raisecanexecutechanged issue? or need fix myself until ms does?

use josh smith's relaycommand instead of delegatecommand. fixes issue canexecute commands not being raised, , doesn't leak memory delegatecommand:

"it delegates event subscription commandmanager.requerysuggested event. ensures wpf commanding infrastructure asks relaycommand objects if can execute whenever asks built-in commands."


Comments

Post a Comment

Popular posts from this blog

javascript - Enclosure Memory Copies -

-
function myclass() { //lots , lots of vars , code here. this.bar = function() { //do numerous enclosed myclass vars } this.foo = function() { alert('hello'); //don't enclosed variables. } } each instance of myclass gets own copy of bar , foo, why prototyped methods use less memory. however, know more memory use of inner methods. it seems obvious me (1) below must true. agree? not distinct myclass instances have own distinct copies of bar, must have own distinct copies of myclass enclosure. (or else how bar method keep myclass variables straight on per instance basis?) now (2) question i'm after. since inner foo method doesn't use in myclass enclosure natural qustion is: javascript smart enough not keep myclass enclosure in memory use of foo? this depend entirely on implementation not language. naive implementations keep far more around others. answer true e.g. v8 (chrome's js engine) may not true spider...
Read more

php - Replacing tags in braces, even nested tags, with regex -

-
example preg_replace('/\{[a-za-z.,\(\)0-9]+\}/', 'replaced', 'lorem ipsum dolor sit {tag1({tag2()})}, consectetur adipiscing elit.'); the result: lorem ipsum dolor sit {tag1(replaced)}, consectetur adipiscing elit. question as can see "tag2" has been replaced, want replace "tag1" know how can this? (in cases might this: {tag1({tag2({tag3()})})}) , on.) btw using preg_replace_callback, easier show preg_replace here site can test code: http://www.spaweditor.com/scripts/regex/index.php you need add curly braces character set. here's pattern used: /\{[a-za-z.,\(\)\{\}0-9]+\}/ and here result: "lorem ipsum dolor sit replaced, consectetur adipiscing elit."
Read more