动态设置XMLDataProvider源

Question

While all examples and sources I found is to set the resource in XAML statically, I would only know in run time the name of the XML file to be connected with XMLDataProvider. Is there a way to set either in code behind or in XAML?

<Window.Resources>
    <XmlDataProvider x:Key="XMLFoo" Source="Foo.xml" XPath="Foo"/>
</Window.Resources>

It could be Foo.xml, or could be Goo.xml.

Answer 1

Yes you can change that while runtime. Unfortunately you cannot bind it, so you have to do stuff in Code-Behind.

Here's a simple example:

(this.Resources["XMLFoo"] as XmlDataProvider).Source = new Uri("Goo.xml");

Cheers

Answer 2

If you are trying to have just one instance of XamlDataProvider and would like your source to change dynamically, I don't think it is possible in pure XAML as you cannot bind to Source property, since that is not a DependencyProperty .

From code-behind, you can get the instance your provider and change it's source.

var provider = (XmlDataProvider) Resources.FindName("XMLFoo");
provider.Source = new Uri("bar.xml", UriKind.Relative);

Alternatively, you can use MVVM and expose your XmlDataProvider as a property on the ViewModel and bind it to your View, you can then change the Source and refresh data from the ViewModel itself.