嵌套泛型

发布于 2024-07-25 22:05:14 字数 454 浏览 6 评论 0原文

我以前问过这个问题，但我没有回答正确的问题，所以错过了答案。

如果我有一个返回 ObservableCollection 的方法，那么我将如何在另一个通用方法中使用它。

将

method2<ObservableCollection<T>>(){}

是要走的路。

我正在尝试创建一个通用的 resultEventArgs，它将 Ado.NET Dataservices 查询的结果传递给所有订阅者。在里面，我希望能够传递返回的强类型 EntityCollection [Ado.NET 1.5 生成]

所以是的，我的问题措辞为 ObservableCollection 因为我不想得到整个 ado。网络数据服务混乱。

干杯戴夫

原文

I have asked this before but I didn't get the question right so the answer was missed.

If I have a method that returns an ObservableColletion<T> how would I then use this in another generic method.

Would

method2<ObservableCollection<T>>(){}

be the way to go.

I am trying to make a generic resultEventArgs that will pass the results of an Ado.NET Dataservices query to all subscribers. Inside that I want ot be able to pass the strongly typed EntityCollection that is returned [Ado.NET 1.5 generated]

So yes, my question is worded ObservableCollection because i didn't want to get the whole ado.net dataservices confusion.

Cheers
Dave

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坏尐絯℡ 2024-08-01 22:05:14

这取决于; 您要指定 item 类型还是 collection 类型？如果您只想指定项目，则 T 仅与该项目相关：

public ObservableCollection<T> SomeMethod<T>()
{
    var data = new ObservableCollection<T>();
    data.Add(default(T)); // or whatever
    return data;
}

然后您可以使用 ObservableCollection; order = SomeMethod() 等。如果需要指定集合类型，则可能需要更多泛型类型...

public TList SomeMethod<TList, T>()
    where TList : class, IList<T>, new()
{
    var data = new TList();
    data.Add(default(T)); // or whatever
    return data;
}

但是，调用它比较棘手。除非列表是参数，否则它无法进行类型推断，这意味着在调用它时必须同时指定 TList 和 T...不太漂亮。

It depends; do you want to specify the item type, or the collection type? If you just want to specify the item, then the T relates just to the item:

public ObservableCollection<T> SomeMethod<T>()
{
    var data = new ObservableCollection<T>();
    data.Add(default(T)); // or whatever
    return data;
}

Then you can use ObservableCollection<Order> orders = SomeMethod<Order>() etc. If you need to specify the collection type, you may need more generic types...

public TList SomeMethod<TList, T>()
    where TList : class, IList<T>, new()
{
    var data = new TList();
    data.Add(default(T)); // or whatever
    return data;
}

However, calling it is trickier. It can't do type inference unless the list is an argument, meaning you have to specify both TList and T when calling it... not pretty.

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