绑定InputBindings后，TextEdit绑定变为null

Question

I had a button and TextEdit like this, they were working correctly:

<dxe:TextEdit Text="{Binding SearchText}" />
<Button Command="{Binding SearchCommand}" / >

I wanted to make search when user hits Enter, so I changed my code this way :

<dxe:TextEdit Text="{Binding SearchText}"  >
                    <dxe:TextEdit.InputBindings>
                        <KeyBinding Key="Enter" Command="{Binding SearchCommand}"  />
                    </dxe:TextEdit.InputBindings>
                </dxe:TextEdit>
<Button Command="{Binding SearchCommand}">

This works, but in the code, SearchText is always null. So I broke something when I added input bindings, can you tell me how to fix this? I also tried this one, but SearchText is still null.

<KeyBinding Key="Enter" Command="{Binding SearchCommand}"  CommandParameter="{Binding Path=Text, RelativeSource={RelativeSource AncestorType={x:Type dxe:TextEdit}}}" />

Answer 1

If I remember correctly the default UpdateSourceTrigger property for DevExpress editors is LostFocus (I might be wrong on this)

And to make your code work, you have to force the source to update whenever the target value changes, by setting UpdateSourceTrigger to PropertyChangted.

You can read more about UpdateSourceTrigger property on MSDN

Answer 2

Have you nofity about change in code? You have to do it by inheriting INotifyPropertyChanged interface in your class and invoke PropertyChangedEventHandler event;