是否可以使用WPF将元素的可见性属性绑定到XML？

Question

I have an XML containing lots of information, but there are some informations that isn't supposed to be shown unless it exists in the xml. I know I can do this manually, but it's not good.

imagine the xml something like this:

<root>
    <MandatoryContent />
    <OptionalContent />
</root>

I want to bind a button's visibility property to the existence of the OptionalContent element. Is it possible?

Answer 1

You can bind your element directly to the object it represents and then use a converter to set the visibility to Visibility.Visible when not null.

 <Label Visibility="{Binding MyObject, Converter={StaticResource NullToVisibilityConverter}} />

Be sure to declare your converter in the ressources

<win:CustomWindow.Resources>
    <Converters:NullToVisibilityConverter x:Key="NullToVisibilityConverter" />
</win:CustomWindow.Resources>

And if you want a good example of converter, here is IValueConverter from MSDN http://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter.aspx

Answer 2

You can't bind directly to XML, but you can use something to create objects from XML.

LinqToXSD is a good candidate here.

It works like this: You create Xml Schema, LinqToXSD creates classes based on your schema, then you can read the XML and it will create the whole object tree based on your XML.