Question

I have a small Dialog where i can set a value. The View of this Dialog has just one TextBox and two buttons. I am binding the textbox.Text to a property TbText in the ViewModel. Through a behavior i close the view from it’s viewmodel. The code to open this dialog looks like:

AddLineDialog dialog = new AddLineDialog();
bool? result = dialog.ShowDialog();
if(result.HasValue && result.Value)
{
//Here i need the Text from the closed dialog
}
...

After the Dialog is closed i need to access the value of the Property TbText. How can i achive this?

Answer 1

You can bind a ViewModel or any class to the Dialog’s Datacontext:

    AddLineDialog dialog = new AddLineDialog();
    var vm = new LineDialogViewModel();
    dialog.DataContext = vm;

Then bind the textbox to a property from your class

    <textbox Value="{Binding MyProperty}">

After this you can read out your class

    if(dialog.ShowDialog())
    {
       var value = vm.MyProperty;
    }