具有通用接口的通用方法
我正在尝试创建一个通用方法，其中类型是通用接口。
private void ShowView<T>(string viewName) where T : IView<Screen>
{
IRegion mainRegion = _regionManager.Regions[RegionNames.MainRegion];
T view = (T)mainRegion.GetView(viewName);
if (view == null)
{
view = _container.Resolve<T>();
mainRegion.Add(view, viewName);
}
mainRegion.Activate(view);
view.LoadData();
view.ViewModel.IsActive = true;
}
界面是IView。
所以我有 ConcreteView : IView 和 ConcreteViewModel : Screen 其中 Screen 是基类。当我尝试执行 ShowView 时，出现 UnknownMethod 错误。
是因为 ConcreteView 使用 ConcreteViewModel 而不是 Screen 来实现 IView 吗？有没有办法重写该方法使其有效？
I'm trying to create a generic method where the type is a generic interface.
private void ShowView<T>(string viewName) where T : IView<Screen>
{
IRegion mainRegion = _regionManager.Regions[RegionNames.MainRegion];
T view = (T)mainRegion.GetView(viewName);
if (view == null)
{
view = _container.Resolve<T>();
mainRegion.Add(view, viewName);
}
mainRegion.Activate(view);
view.LoadData();
view.ViewModel.IsActive = true;
}
Interface is IView<T> where T : Screen.
So I have ConcreteView : IView<ConcreteViewModel> and ConcreteViewModel : Screen where Screen is the base class. When I try to do ShowView<ConcreteView>("concrete"); I get an UnknownMethod error.
Is it because ConcreteView uses ConcreteViewModel instead of Screen for it's IView implementation? Is there a way to rewrite the method so that it works?
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IView不是一个IView而不为界面提供变化（上面可以从 C# 4.0 开始完成）
否则，您应该能够编写您的方法签名如下所示
并像
ShowView("blah"); 那样调用它 IView<ConcreteViewModel>is not anIView<Screen>without providing variance to the interface(The above can be done starting in C# 4.0)
Otherwise, you should be able to write your method signature like below
And invoke it like
ShowView<ConcreteView, ConcreteViewModel>("blah");