投LINQ结果的ObservableCollection [英] Cast LINQ result to ObservableCollection

问题描述

事实上，它是一个LINQ的结果或许可以不相关的问题，但我无论如何提它 - 因为这是导致这一问题的背景。

The fact that it is a LINQ result might perhaps not be relevant for the question, but I'm mentioning it anyway - since this is the context which has resulted in this question.

我运行一个LINQ查询。结果是一个;

I run a LINQ query. The result is an;

IEnumerable<MyClass>

我想结果放入一个ObservableCollection;

I want to put the result into an ObservableCollection;

ObservableCollection<MyClass>

我如何做投？ （不通过IEnumerable和复制元素到的ObservableCollection运行）。我注意到LINQ已经得到了几把。（）函数，但似乎并没有帮助我这个投..？

How do I do this cast? (without running through the IEnumerable and copying elements to the ObservableCollection). I notice LINQ has got a few To..() functions, but it doesn't seem to help me for this cast..?

推荐答案

只需使用：

ObservableCollection<Foo> x = new ObservableCollection<Foo>(enumerable);

这将做必要的复制。有没有观察更改现场查询的方式 - 虽然这个想法的 ObservableQuery＆LT; T＆GT; 是一个有趣的（尽管具有挑战性）有一个

That will do the required copying. There's no way of observing changes to the live query - although the idea of an ObservableQuery<T> is an interesting (though challenging) one.

如果你想扩展方法来做到这一点，这很简单：

If you want an extension method to do this, it's simple:

public static ObservableCollection<T> ToObservableCollection<T>
    (this IEnumerable<T> source)
{
    if (source == null)
    {
        throw new ArgumentNullException("source");
    }
    return new ObservableCollection<T>(source);
}

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