如何Form.howDialog（）使用MVP和被动视图？
概要
我正在试验Windows窗体应用程序中的MVP模式。
我想让我的演示者和视图平台都不可知，所以如果我希望将我的应用程序移植到另一个平台，比如Web或移动平台，我只需要使用平台相关的GUI来实现视图，而演示者仍然可以平台独立。
现在我想知道， 如何使用MVP和被动视图ShowDialog（）？
到目前为止，我的理解是，被动的观点不应该知道/关心任何主持人。 他们甚至不知道它存在。 所以，在这个问题的答案中提出的解决方案并不合适，根据我：重构Form.ShowDialog（）代码为MVP
一些代码示例有助于理解：
ApplicationView
public partial class ApplicationForm : Form, IApplicationView {
// I ensure that all the IApplicationView events are raised
// upon button clicks text changed, etc.
// The presenter, which this view ignores the existence,
// is subscribed to the events this view raises.
}
ApplicationPresenter
public class ApplicationPresenter
: Presenter<IApplicationView>
, IApplicationPresenter {
public ApplicationPresenter(IApplicationView view) : base(view) {
View.OnViewShown += OnViewShown;
}
public void OnViewShown() {
IAuthenticaitonView authView = new AuthenticationForm();
IAuthenticationPresenter authPresenter = new AuthenticationPresenter(authView);
authPresenter.ShowDialog(); // 1.
}
}
IAuthenticationView和IAuthenticationPresenter知道用户身份验证。 IAuthenticationView
public interface IAuthenticationView : IDialogView {
string ErrorMessage { get; set; }
string Instance { get; set; }
IEnumerable<string> Instances { get; set; }
string Login { get; set; }
string Password {get; set; }
void EnableConnectButton(bool enabled);
event VoidEventHandler OnConnect;
event SelectionChangedEventHandler OnDatabaseInstanceChanged;
event VoidEventHandler OnLoginChanged;
event VoidEventHandler OnPasswordChanged;
}
IDialogView
public interface IDialogView : IView {
void ShowDialog();
}
IView
public interface IView {
void Show();
event VoidEventHandler OnViewInitialize;
event VoidEventHandler OnViewLoad;
event VoidEventHandler OnViewShown;
}
IAuthenticationPresenter
public interface IAuthenticationPresenter : IPresenter<IAuthenticationView> {
void OnConnect();
void OnViewDatabaseInstanceChanged(SelectionChangedEventArgs e);
void OnViewLoginChanged();
void OnViewPasswordChanged();
}
IPresenter<V>
public interface IPresenter<V> where V : IView {
V View { get; }
OnViewInitialize();
OnViewLoad();
ShowView();
}
基于这些前提：
我来到这里：
IView
public interface IView {
void OnShowView();
}
IPresenter<V>
public interface IPresenter<V>where V : IView {
void ShowView();
event VoidEventHandler OnShowView;
}
Presenter<V>
public abstract class Presenter<V> : IPresenter<V> {
public Presenter(V view) {
View = view;
OnShowView += View.OnShowView;
}
public void ShowView() { raiseShowViewEvent(); }
public event VoidEventHandler OnShowView;
private void raiseShowViewEvent() { if (OnShowView != null) OnShowView(); }
}
所以，按照我迄今为止奋斗的逻辑，我通过这样做来解决它：
ApplicationForm
public partial class ApplicationForm : Form, IApplicationView {
private void ApplicationForm_Shown(object sender, EventArgs e) { raiseOnViewShown(); }
private void raiseOnViewShownEvent() { if (OnViewShown != null) OnViewShown(); }
}
ApplicationPresenter
public void OnViewShown() {
// This method is the subscriber of the IView.OnViewShown event
// The event is raised with the ApplicationForm_Shown event.
IAuthenticationView authView = new AuthenticationForm();
IAuthenticationPresenter authPresenter = new AuthenticationPresenter(authView);
authPresenter.ShowView(); // 1.
}
OnShowView事件。 然后，回到表单中，视图对事件的响应是： AuthenticationForm
public partial class AuthenticationForm : Form, IAuthenticationView {
public void OnShowView() { ShowDialog(); }
}
然后，视图将自身显示为对话框/模式窗口。
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