Bind ViewModel Command to UI event in WPF

Question

I have an Project object it has a Name Property.

The ViewModel for project contains a ICommand called SaveCommand which persists in the database.

I have a textbox in my UI that binds to Name

<TextBox Text="{Binding Name}" LostFocus="??????" />

How do I bind my SaveCommand to the TextBox ecent LostFocus? So when the textbox loses focus the ICommand SaveCommand will run?

Please ignore this question. I solved it by adding a new property to my modelView.

Answer 1

You can only bind command to a Command property.

BUT, there is two solutions:

-Fire your event on a method which call a command in your VM (but some code will be not testable)

-you can develop your own MarkupExtension to do LostFocus="{YouExtension YouCommand}"

Answer 2

Hi. Try looking into using attached behaviours. There is a lot of articles around about this, so just try to google for it. Here is one:

link text

Best regards, Rune

Answer 3

Caliburn (http://www.codeplex.com/caliburn) has a reusable "Actions" concept which uses attached behaviors to generically allow you to bind events to methods on your ViewModel.