C＃LINQ工会问题 [英] C# linq union question

问题描述

有人能解释LINQ如何做联盟工作？

Could someone explain how does Union in LINQ work?

据告知，合并两个序列的删除重复的

It is told that it merges two sequences and removes duplicates.

不过，我能以某种方式自定义重复删除行为 - 比方说，如果我想从第二个序列重复的情况下，或者从第一个序列。

But can I somehow customize the duplicate removal behavior - let's say if I wish to use the element from the second sequence in case of duplicate or from the first sequence.

或即使我希望得到的序列中以某种方式结合起来的价值观？

Or even if I wish to somehow combine those values in the resulting sequence?

的如何应该是被实施？的

我猜我错误地描述了问题，让我们说我们有一定的价值：

I guess I described the problem incorrectly, let's say we have some value:

class Value {
   String name
   Int whatever;
}

和使用的比较器执行 x.name = = y.name 支票。

and the comparer used performs a x.name == y.name check.

和我们说，有时我知道我应该从第二顺序取元素，因为它的任何字段更新/比第一序列的任何字段更好。

And let's say that sometimes I know I should take the element from the second sequence, because it's whatever field is newer / better than the whatever field of the first sequence.

无论如何，我会使用 sequence1.Union（sequence2）或 sequence2.Union（序列1）的方法的变化。

Anyway, I would use the sequence1.Union(sequence2) or sequence2.Union(sequence1) variation of the methods.

感谢您

推荐答案

您可以使用 second.Union（第一）而不是 first.Union（二） 。这样的话，它会不断从项目第二个而不是从第一。

You can use second.Union(first) instead of first.Union(second). That way, it will keep the items from second rather than the items from first.

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