将LINQ结果转换为ObservableCollection [英] Cast LINQ result to ObservableCollection

问题描述

事实上，它是一个LINQ结果也许不是相关的问题，但我提到它无论如何 - 因为这是导致这个问题的上下文。

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> 

我想将结果放入ObservableCollection;

I want to put the result into an ObservableCollection;

ObservableCollection<MyClass> 

如何做这个演员？ （不通过IEnumerable并将元素复制到ObservableCollection）。我注意到LINQ有一些To ..（）函数，但它似乎并没有帮助我这个演员..？

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);

这将执行所需的复制。没有观察到实时查询的变化的方法 - 尽管 ObservableQuery< T> 的想法是一个有趣的（虽然具有挑战性）。

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.

如果你想要一个扩展方法这样做，它很简单：

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);
}

这篇关于将LINQ结果转换为ObservableCollection的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！