交互触发器和通用属性？

发布于 2024-12-01 10:11:20 字数 694 浏览 0 评论 0原文

我创建了一个 TriggerBase 类，名称为 CollectionContainsValueTrigger。顾名思义，只要触发器包含特定值，就会调用该操作。

但是，我想创建触发器，以便它以接受 T 的各种 ObservableCollection 的方式运行，而不仅仅是显式类型的 ObservableCollection。我尝试了对象的 ObservableCollection，但绑定不起作用，因为类型与我的 ViewModel 的显式类型 ObservableCollection 不同。

我该怎么做？

xaml 示例：

  <i:Interaction.Triggers>
    <mi:CollectionContainsValueTrigger Collection="{Binding SomeStronglyTypedViewModelCollection}" Value="Some Value">
      <SomeAction />
    </mi:CollectionContainsValueTrigger>
  </i:Interaction.Triggers>

原文

I've created a TriggerBase class, name CollectionContainsValueTrigger. As its name suggests, the trigger invokes the action whenever it contains a certain value.

However, I would like to create the trigger so it acts in such a way that it accepts all kinds of ObservableCollection of T, not just an explicit typed of ObservableCollection. I tried ObservableCollection of object but the binding doesn't work because the Type is different from my ViewModel's explicitly typed ObservableCollection.

How can I do this?

xaml example:

  <i:Interaction.Triggers>
    <mi:CollectionContainsValueTrigger Collection="{Binding SomeStronglyTypedViewModelCollection}" Value="Some Value">
      <SomeAction />
    </mi:CollectionContainsValueTrigger>
  </i:Interaction.Triggers>

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(り薆情海 2024-12-08 10:11:20

如果没有看到一些你想要实现的目标的例子，就很难提出建议。

如果我正确理解您的非泛型类需要对不同类型的某些基于泛型的类（如 ObservableCollection）进行多态访问，

为了适应这一点，我将使用多态适配器：

class ObservableCollectionAdapterBase 
{
  virtual void Method1(){}
  virtual void Method2(){}
}

class ObservableCollectionAdapter<T, TCollectionType> : ObservableCollectionAdapterBase 
where TCollectionType : IObservableCollection<T> 
{
   public ObservableCollectionAdapter(TCollectionType collection)
   {
      _collection = collection;
   }

   override void Method1(){ _collection.DoSomething(); }
   override void Method2(){ _collection.DoSomething(); }
}

It is hard to suggest without seeing some examples of what you are trying to acheive.

If i understand correctly your non-generic class needs polymorphic access to some generic-based classes (like ObservableCollection) of different types

To accomodate this I would use a polymorphic adapter:

class ObservableCollectionAdapterBase 
{
  virtual void Method1(){}
  virtual void Method2(){}
}

class ObservableCollectionAdapter<T, TCollectionType> : ObservableCollectionAdapterBase 
where TCollectionType : IObservableCollection<T> 
{
   public ObservableCollectionAdapter(TCollectionType collection)
   {
      _collection = collection;
   }

   override void Method1(){ _collection.DoSomething(); }
   override void Method2(){ _collection.DoSomething(); }
}

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