Revisions to Generic interface implementation confusion

deleted 1 character in body

edited Sep 4, 2018 at 14:45

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Change your IUserDefinedListEditViewModel interface to:

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2>, where T2 : IBaseUserDefinedListModel

After that, and update the implementation in APEditViewModel:

public class APEditViewModel : IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>

The error indicates that with the generic constraint

where T : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

only IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.

Change your IUserDefinedListEditViewModel interface to:

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2>, where T2 : IBaseUserDefinedListModel

After that, and update the implementation in APEditViewModel:

public class APEditViewModel : IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>

The error indicates that with the generic constraint

where T : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

only IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.

Change your IUserDefinedListEditViewModel interface to:

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2> where T2 : IBaseUserDefinedListModel

After that, and update the implementation in APEditViewModel:

public class APEditViewModel : IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>

The error indicates that with the generic constraint

where T : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

only IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.

added 7 characters in body

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edited Sep 4, 2018 at 11:30

ikkentim

1.7k
15
30

UseChange your IUserDefinedListEditViewModel interface to:

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2>, where T2 : IBaseUserDefinedListModel

When you useAfter that, and update the implementation in APEditViewModel:

wherepublic Tclass APEditViewModel : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>

AfterThe error indicates that, you can use the following to tag with the APEditViewModelgeneric constraint

public classwhere APEditViewModelT : IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

ONLYonly IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.

Use

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2>, where T2 : IBaseUserDefinedListModel

When you use

where T : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

After that, you can use the following to tag the APEditViewModel

public class APEditViewModel : IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>

ONLY IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.

Change your IUserDefinedListEditViewModel interface to:

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2>, where T2 : IBaseUserDefinedListModel

After that, and update the implementation in APEditViewModel:

public class APEditViewModel : IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>

The error indicates that with the generic constraint

where T : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

only IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.

Added class definition

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edit approved Sep 4, 2018 at 11:29

Oswald

1.3k
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32

Use

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2>, where T2 : IBaseUserDefinedListModel

When you use

where T : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

After that, you can use the following to tag the APEditViewModel

public class APEditViewModel : IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>

ONLY IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.

Use

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2>, where T2 : IBaseUserDefinedListModel

When you use

where T : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

ONLY IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.

Use

public interface IUserDefinedListEditViewModel<T1,T2> where T1 : IUserDefinedListEntryEditViewModel<T2>, where T2 : IBaseUserDefinedListModel

When you use

where T : IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel>

After that, you can use the following to tag the APEditViewModel

public class APEditViewModel : IUserDefinedListEditViewModel<APEntryEditViewModel, APModel>

ONLY IUserDefinedListEntryEditViewModel<IBaseUserDefinedListModel> and types which implement this interface will be accepted as T. If you want any IBaseUserDefinedListModel to be accepted in the type parameter of T, you need to make it generic as well.