LINQ 上的简单查询

发布于 2024-09-26 03:26:03 字数 497 浏览 2 评论 0原文

var q = from child in doc.Descendants("level")
        where (int)child.Attribute("id") == 55
        select (string)child.Element("Points").**Value.ToString()**;

我想在执行此查询后获取 q 作为类型字符串。即使在保留额外的粗体线之后，这也给了我一些 IEnumerable 类型。

好吧，让我这样说吧。我想让上面的查询类似于下面的查询，而运行时不会抛出任何错误。

string q = from child in doc.Descendants("level")
           where (int)child.Attribute("id") == 55
           select (string)child.Element("Points");

有什么帮助吗？

原文

var q = from child in doc.Descendants("level")
        where (int)child.Attribute("id") == 55
        select (string)child.Element("Points").**Value.ToString()**;

I would like to get q as a type string after executing this query. Even after keeping the extra bolded line this is giving me some IEnumerable type.

Well let me put it this way. I would like to make the above query something like below one without the runtime throwing any error.

string q = from child in doc.Descendants("level")
           where (int)child.Attribute("id") == 55
           select (string)child.Element("Points");

Any help?

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旧人哭 2024-10-03 03:26:03

var q = (from child in doc.Descendants("level")
        where (int)child.Attribute("id") == 55
        select (string)child.Element("Points")).FirstOrDefault();

Enumerable.FirstOrDefault 方法 (IEnumerable)

var q = (from child in doc.Descendants("level")
        where (int)child.Attribute("id") == 55
        select (string)child.Element("Points")).FirstOrDefault();

Enumerable.FirstOrDefault Method (IEnumerable)

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眼角的笑意。 2024-10-03 03:26:03

LINQ总是返回一个可枚举的结果。要让它评估并返回一个结果，您可以使用

根据您的要求。

农村范ル 2024-10-03 03:26:03

即使结果包含单个记录，查询也会返回 IEnumerable。试试这个 -

if q.count() > 0
    var singleQ = q.First();

或者如果你确定至少会有一条记录，那么就这样做 -

string q = (from child in doc.Descendants("level")
           where (int)child.Attribute("id") == 55
           select (string)child.Element("Points")).First();

The query will return IEnumerable even if the result contains single record. Try this -

if q.count() > 0
    var singleQ = q.First();

Or if you are sure that there will be atleast one record then do it like this -

string q = (from child in doc.Descendants("level")
           where (int)child.Attribute("id") == 55
           select (string)child.Element("Points")).First();

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