CODEWITHSUNDEEP
mvvmcatel
Johnny Beatniks
Johnny Beatniks

Reputation: 33

Changing a value of an item in an ObservableCollection

Typical customer invoice scenario:

ObservableCollection in a viewmodel that holds LineItems. The view lists the LineItems with a calculated LineTotal shown at the end of each line. The, there's a GrandTotal shown at the bottom of the page.

If the user makes a change to Qty, to update other items on the page, I use an EventToCommand trigger on a TextBox that is bound to the Qty. When the command is invoked, I manually recalculate line totals and invoice totals to reflect changes.

Is there a better way to reflect changes made by the user to the Qty boxes? A way to force "rebinding" to refresh the page? Is there anything in Fody or Catel that handles this?

Upvotes: 0

Views: 84

Answers (1)

Johnny Beatniks
Johnny Beatniks

Reputation: 33

Got It! I still use the EventtoCommand to fire a command in the viewmodel which calls base.RaisePropertyChanged("CurrentInvoice"). Then, anything bound to CurrentInvoice will be refreshed.

If there are nested viewmodels, send a message to the level of the property and then call base.RaisePropertyChanged("PropertyName").

Upvotes: 1

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