MarkupExtension.ProvideValue - is IServiceProvider really used?

Question

I was going through some old code and came across a hybrid class IValueConverter/ MarkupExtension. I was wondering if the method is useful IServiceProviderin the method ProvideValueand how will it be useful?

I see that there IServiceProvideris only one method: GetServicethat must be assigned to the correct type of service. I also looked at the MarkupExtension.ProvideValue MSDN page and lists various types of services. I think I'm just wondering if any of these services are useful or should I leave my method as it is?

Current Method:

public Object ProvideValue(IServiceProvider serviceProvider)
{
    return new MyConverter();
}

Basically, should I do the following:

public Object ProvideValue(IServiceProvider serviceProvider)
{
    var provider = serviceProvider as SomeType;

    if (provider == null) return new MyConverter();

    //Do something with the provider here?
}

Answer 1

MarkupExtension , - IServiceProvider, , , . MarkupExtension/ValueConverter , , .

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Answer 2

, , . ,

public override object ProvideValue(IServiceProvider provider)
{
    IProvideValueTarget service = (IProvideValueTarget)provider.GetService(typeof(IProvideValueTarget));
    DependencyObject targetObject = service.TargetObject as DependencyObject;
    DependencyProperty targetProperty = service.TargetProperty as DependencyProperty;

    // ...
}