Question

I want to create a control like this:

I created view and viewmodel of this control and I added new property – “FileURL”.

I want to use this property like this:

<vm:FileSelector FileURL="{Binding Something}"/>

And now it is a problem:

My new control contains button and textbox.
I want that property “FileURL” of FileSelector contains the same value as “Text” of TextBox used inside FileSelector.

So in XAML declaration of new control i wanted to add something like that:

<UserControl x:Class="namespace.FileSelector"
...
FileURL="{Binding ElementName=txtBoxExampleName, Path=Text}">

But this operation is not allowed.

I do not know how can i change value of property “FileURL” inside FileSelector control using MVVM pattern.

Answer 1

Assuming that FileURL is a DependencyProperty in FileSelector then you would just do the following in the FileSelector.xaml:

     <TextBox Text="{Binding FileURL, RelativeSource={RelativeSource FindAncestor, AncestorType=UserControl}}"/>