wpf - Recommend best approach in this situation -

i'm experimenting mvvm , can't quite wrap mind around it.

i have view (windows) has several repeated controls.

let's have 4 textbox - button pairs. behavior should same, after pressing button paired textbox says "hello world!"

i have tried several options think of:

1. one viewmodel, 4 string properties binded textboxes, 1 command
   • when bind each button same command can't tell property needs set.
   • passing enum commandparameter feels awkward.
2. one viewmodel , usercontrol hosts textbox , button repeated 4 times.
   • now need expose properties command, commandparameter, text etc.. seems lot of work.
   • still can't property needs updated after click.
3. each usercontrol has viewmodel
   • this solves button clicking , setting property, have no clue how extract texts nested viewmodels window viewmodel.

is there other way? suspect datatemplates of use, i'm not sure how.

what describe such abstract , contrived idea doesn't warrant mvvm. you're talking textboxes , buttons, 'view', , not mvvm way of thinking. you'd start model.

there no 'model' per-se here though; specification literally set value of textbox on button click. seemingly random list of '4' items (picked out of nowhere) , seemingly useless textbox mean nothing.

putting aside , assuming have set of 4 business entities, each field on them user-editable, , action user can trigger, you'd this:

• create viewmodel class represent item - eg myitemmodel
• create viewmodel class represent set of items (likely return collection of first) - eg allmyitemslistmodel

then view:

• create itemscontrol, itemssource bound instance of 'collection' of second viewmodel class
• for each itemtemplate, have template or usercontrol each item
• within template or usercontrol, bind textbox's text property appropriate property of first class
• bind button's command property property on first class returning icommand - using relaycommand example

i don't know mean 'extracting texts nested viewmodels window viewmodel' - mean , why want it?

hope helps.