WPF Custom Control - Binding a template item to a Path -

-

in wpf custom control template, there way can following in xaml?:

var selitemtext = this.gettemplatechild("part_selecteditemtext") textblock; var binding = new binding("selecteditem." + displaymemberpath); binding.relativesource = new relativesource(relativesourcemode.templatedparent); selitemtext .setbinding(textblock.textproperty, binding);

note interesting part of statement binding constructor - building path based on both text specify ("selecteditem."), , path provided user.

the consumer use control similar to:

<c:mycontrol displaymemberpath="description" />

short answer: no, it's not possible entirely in xaml within controltemplate

your possibilities are:

  • use have (possibly using attached properties / behavior make more mvvm-like)
  • use multibinding 1 binding "selecteditem" other "displaymemberpath" , multivalueconverter using reflection reflect down displaymemberpath (may bit ugly)
  • create class inherits binding , exposes properties can bind displaymemberpath , changes underlying binding (read here how can this) (complicated)
  • use reflection instantiate ms.internal.data.displaymembertemplateselector / build similar
  • think if design right. other control being kind of itemscontrol (if case should inherit itemscontrol , use displaymemberpath there), don't see why shouldn't use binding on outside <c:mycontrol displaymember="{binding selecteditem.description}" /> , in controltemplate use templatebinding bind "displaymember"

Comments

Post a Comment

Popular posts from this blog

Javascript line number mapping -

-
magically formatted comments change reported line number of javascript errors in browsers; this: //@line n "f" n line number , f file name. unfortunately, //@line appears ungoogleable. know there documentation on feature, , browsers support it? (i found references here , here .) from can find available in mozilla based browsers. it using js_setoptions command can turn these options on or off depending on values passed. https://developer.mozilla.org/en/js_setoptions
Read more

c# - Is it possible to remove an existing registration from Autofac container builder? -

-
something along lines: builder.registertype<mytype>().as<itype>(); builder.registertype<mytype2>().as<itype>(); builder.deregistertype<mytype>().as<itype>() var container = builder.build(); var types = container.resolve<ienumerable<itype>>(); assert.istrue(types.count == 1); assert.istrue(types[0].gettype == typeof(mytype2)); scenario: go through bunch of assemblies , go register types want make sure have 1 implementation of given type. need before create container. track on own nice if autofac me bit. this cannot done directly using containerbuilder , unless start on new one. mind you, having first built container should able construct new container filtering away unwanted types , reusing registrations first container. this: ... var container = builder.build(); builder = new containerbuilder(); var components = container.componentregistry.registrations .where(cr => cr.activator.limittype != typ...
Read more

php - Mysql PK and FK char(36) vs int(10) -

-
i have read mysql can handle indexes , searches better if tables keys integers rather char(36) uuid's. is worth converting int(10)? note: use 1 server , have have plans use multiple databases concurrently therefore removing 1 of big reasons using uuid. our tables innodb if makes difference. thanks in advance. usually rdbms can handle integer keys pk more efficient, other datatypes. reason how build index column, yes: long dont require string (or other typed) keys, should use integers. however: char(36) , int(10) far away being equal, because int(10) much smaller, char(36). dont know, if require many different keys, should keep in mind. update, complete last paragraph: int(10) 32-bit, char(36) 36 - ^byte^ (= 288-bit). not mean, int consumes less space, means, char(36) has 4 times more different keys.
Read more