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POObservableCollection of generic ViewModel class
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Id
4207019
data
AcceptedAnswerId
4232629
AnswerCount
1
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2010-11-17T17:00:45.213
FavoriteCount
0
LastActivityDate
2011-01-05T12:59:59.913
LastEditDate
2010-11-17T17:14:03.557
LastEditorUserId
510760
OwnerUserId
510760
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PostTypeId
1
Score
2
ViewCount
1045
LastEditorDisplayName
text
Body
I'm creating MVVM application and in Model section I have simple base abstract class Animal and class Dog which derives from it: <pre><code>public abstract class Animal { public int Age { get; set; } } public class Dog : Animal { public string Name { get; set; } } </code></pre> ViewModel section containts UI-friendly VM classes of them: <pre><code>public abstract class AnimalVM<T> : ViewModelBase where T : Animal { protected readonly T animal; public int Age { get { return animal.Age; } set { animal.Age = value; OnPropertyChanged("Age"); } } protected AnimalVM(T animal) { this.animal = animal; } } public class DogVM : AnimalVM<Dog> { public string Name { get { return animal.Name; } set { animal.Name = value; OnPropertyChanged("Name"); } } public DogVM(Dog dog) : base(dog) { } } </code></pre> Suppose I have another VM class which contains <code>ObservableCollection<AnimalVM></code>. The problem is how to create that kind of property which allow me to store there different types of Animal? I want to achieve something like this: <pre><code>public class AnimalListVM : ViewModelBase { // here is a problem, because AnimalVM<Animal> isn't compatible with DogVM readonly ObservableCollection<AnimalVM<Animal>> animals; public ObservableCollection<AnimalVM<Animal>> Animals { get { return animals; } } public AnimalListVM(IList<Animal> animals) { //this.animals = ... } } </code></pre> I can change <code>ObservableCollection<AnimalVM<Animal>></code> property to <code>ICollection</code> property and then create list of AnimalVM using some dictionary Animal -> AnimalVM wrapper and <code>Activator.CreateInstance()</code> - it works but when I try to extend AnimalListVM adding another property <code>SelectedAnimal</code> which will be binded in sample View to e.g. DataGrid control I have another problem with type of that kind of property <code>SelectedItem</code>. It can't be of type <code>AnimalVM<Animal></code> because when I have DogVM object in my Collection it won't fit with this and throw an exception. Everything will be clear if only I had non-generic AnimalVM but I don't want to copy and paste similar properties in every DogVM, CatVM, BirdVM class derived from AnimalVM. How can I achieve this?
Tags
<mvvm><viewmodel><generics><observablecollection>
Title
ObservableCollection of generic ViewModel class
singulars
PostAcceptedAnswerId
1. PO
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 PostTypePostTypeId
 PTAnswer
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1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USPawel Sledzikowski
UserOwnerUserId
1. USPawel Sledzikowski
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1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
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VotesPostIdCreationDate
1. VO
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 POObservableCollection of generic ViewModel class
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2. VO
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 POObservableCollection of generic ViewModel class
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