EndEdit equivalent in WPF

Question

I have a WPF Window that contains a TextBox. I have implemented a Command that executes on Crtl-S that saves the contents of the window. My problem is that if the textbox is the active control, and I have newly edited text in the textbox, the latest changes in the textbox are not commited. I need to tab out of the textbox to get the changes.

In WinForms, I would typically call EndEdit on the form, and all pending changes would get commited. Another alternative is using onPropertyChange binding rather than onValidation, but I would rather not do this.

What is the WPF equivalent to EndEdit, or what is the pattern to use in this type of scenario?

Thanks,

Answer 1

Based on Pwninstein answer, I have now implemented an EndEdit in my common class for WPF Views / Windows that will look for bindings and force an update on them, code below;

Code below;

private void EndEdit(DependencyObject parent)
{
    LocalValueEnumerator localValues = parent.GetLocalValueEnumerator();
    while (localValues.MoveNext())
    {
        LocalValueEntry entry = localValues.Current;
        if (BindingOperations.IsDataBound(parent, entry.Property))
        {
            BindingExpression binding = BindingOperations.GetBindingExpression(parent, entry.Property);
            if (binding != null)
            {
                binding.UpdateSource();
            }
        }
    }            

    for(int i=0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(parent, i);
        this.EndEdit(child);
    }
}

protected void EndEdit()
{
    this.EndEdit(this);
}

In my Save command, I now just call the EndEdit method, and I don't have to worry about other programmers selection of binding method.

Answer 2

You can force specific bindings to update using code like the following:

var bindingExpression = txtInput.GetBindingExpression(TextBox.TextProperty);
bindingExpression.UpdateSource();

Doing this more generally is difficult because there is no generic way to get all bindings, nor would you necessarily want them all to updated.