附加属性统一
我需要创建一个附加属性，它与其 PropertyChanged 事件处理程序内的某些服务进行通信。例如
private static void IsRegisteredPropertyChanged(DependencyObject target,
DependencyPropertyChangedEventArgs e)
{
//how to resolve this without service locator?
IService someService = ServiceLocator.Resolve<IService>();
if ((bool)e.NewValue)
{
someService.Register(target);
}
else
{
someService.Unregister(target);
}
}
据我了解，事件处理程序将始终是静态的。除了服务定位器模式之外，是否有任何方法可以使用 Unity 注入此事件处理程序的依赖项？如果没有，那么也许有任何替代方案可以让您以声明方式将视图元素注册到该服务？
I need to create an attached property which communicates with some service inside it's PropertyChanged event handler. E. g.
private static void IsRegisteredPropertyChanged(DependencyObject target,
DependencyPropertyChangedEventArgs e)
{
//how to resolve this without service locator?
IService someService = ServiceLocator.Resolve<IService>();
if ((bool)e.NewValue)
{
someService.Register(target);
}
else
{
someService.Unregister(target);
}
}
As I understand, the event handler will always be static. Is there any way to inject a dependency for this event handler using Unity except with Service Locator pattern? If not then maybe there are any alternatives that let you declaratively register view elements to that service?
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当涉及
static关键字时，执行正确 DI 的唯一方法是通过方法注入。如果您可以通过方法参数之一注入服务，那么您就可以做到 - 否则您就不能。
您仍然可以使用服务定位器，但这不是 DI...
The only way to do proper DI when the
statickeyword is involved is through Method Injection.If you can inject a service through one of the method parameters, you can do it - otherwise you can't.
You can still use a Service Locator, but that's not DI...