Public MustOverride Function ProvideValue ( _
    serviceProvider As IServiceProvider _
) As Object

Dim instance As MarkupExtension
Dim serviceProvider As IServiceProvider
Dim returnValue As Object

returnValue = instance.ProvideValue(serviceProvider)

public abstract Object ProvideValue(
    IServiceProvider serviceProvider
)

public:
virtual Object^ ProvideValue(
    IServiceProvider^ serviceProvider
) abstract

public abstract Object ProvideValue(
    IServiceProvider serviceProvider
)

public abstract function ProvideValue(
    serviceProvider : IServiceProvider
) : Object

メソッドは XAML では使用できません。