[英]Add Collection to End of IOrderedEnumerable
I currently have a bunch of config files I need to load into an IOrderedEnumerable My current approach looks like so: 我目前有一堆配置文件,需要将其加载到IOrderedEnumerable中。我当前的方法如下所示:
foreach (var item in configFiles)
{
XDocument myxml = XDocument.Load(item);
var items = myxml.Root.Elements("Item");
Items = items.OrderBy(x => x.Attribute("ID").Value);
ItemsLength += Items.Count();
}
The problem is, instead of making Items
equal to items.OrderBy(x => x.Attribute("ID").Value)
I'd like to join that to the end of the currently existing IOrderedEnumerable so I'm not overwriting it each time I load a new XDocument and get all of the elements from it. 问题是,不是让
Items
等于items.OrderBy(x => x.Attribute("ID").Value)
我想将其加入到当前现有IOrderedEnumerable的末尾,因此我不会覆盖它每次加载新的XDocument并从中获取所有元素时。 How would I do this? 我该怎么做?
EDIT: I know that if I change this ItemsLength += Items.Count();
编辑:我知道,如果我更改此
ItemsLength += Items.Count();
will no longer function properly. 将不再正常运行。 That's something I'll change on my own.
那是我自己改变的事情。
You can do the whole thing declaratively: 您可以声明性地完成整个操作:
Items = configFiles.Select((item, index) => new { Doc = XDocument.Parse(item),
Index = index })
.SelectMany(pair => pair.Doc.Root.Elements("Item")
.Select(x => new { Item = x,
Index = pair.Index }))
.OrderBy(pair => pair.Index)
.ThenBy(pair => (string) pair.Attribute("ID"))
.Select(pair => pair.Item);
This basically finds all the elements, but remembers which configuration each is in. 这基本上找到了所有元素,但记住了每个元素都在哪个配置中。
Alternatively, just create a List<XElement>
and add each item's contents: 或者,只需创建一个
List<XElement>
并添加每个项目的内容:
var items = new List<XElement>();
foreach (var item in configFiles)
{
items.AddRange(XDocument.Parse(item)
.Root.Elements("Item")
.OrderBy(x => (string) x.Attribute("ID")));
}
Items = items;
In some ways that's less elegant, but it's probably easier to understand :) 在某些方面,它虽然不太优雅,但可能更容易理解:)
If you can change Items
to be of type IEnumerable
rather than IOrderedEnumerable
, you could use Concat
: 如果您可以将
Items
更改为IEnumerable
类型而不是IOrderedEnumerable
类型,则可以使用Concat
:
Items = Items.Concat(items.OrderBy(x => x.Attribute("ID").Value));
This would keep items sorted by ID
within their own document. 这将使项目在其自己的文档中按
ID
排序。
Note that using Concat
in a loop may impair the performance. 请注意,在循环中使用
Concat
可能会降低性能。 You would be better off declaring Items
as IList
, and calling ToList
at the end of each iteration: 您最好将
Items
声明为IList
,并在每次迭代结束时调用ToList
:
Items.AddRange(items.OrderBy(x => x.Attribute("ID").Value));
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