Question

My WPF application has a number of buttons on its main window. I’m working on an edge case right now where the buttons should be disabled if the database is down or if the application can’t establish a connection to its back-end (the back-end is a Windows service we’ve written).

There are two classes in my View Model library called DbMonitor and ComMonitor (“Com” for “Communications”). They descend from an the same abstract class, implement the IPropertyChanged interface, and have a property called Status (inherited from the abstract base class) which is an enumeration called DeviceStatuses with values Green, Yellow, and Red. I want the Buttons to be enabled only if the Status properties of both objects are Green?

How do get this binding to work in the Xaml, or do I have to do this in my code-behind.

Thanks

Tony

Answer 1

After asking the question, I did some additional research and found a solution that works for me.

I created a class that implements the IMultiConverter interface that converts my DeviceStatuses enumeration to bool. Then, in my Xaml, I did this:

<Button ....>
    <Button.IsEnabled>
        <MultiBinding Converter="{StaticResource DeviceStatusToBool}">
            <Binding Path="..." />
            <Binding Path="..." />
        </MuntiBinding>
    </Button.IsEnabled>
</Button>

This works very well.

I can’t convert the buttons to use ICommand at this point. Not enough time before our release date.

Tony