直接在LINQ语句中的FirstOrDefault行为 [英] FirstOrDefault behavior directly in LINQ statement

问题描述

似乎我可能错过了一些简单的语法，但是我想直接从linq语句获取FirstOrDefault的结果，而不必先将IEnumerable存储在临时变量中.像这样:

Seems like I may have missed something simple in the syntax, but I'd like to get the results of FirstOrDefault from a linq statement directly without having to store the IEnumerable in a temporary variable first. Something like this:

var bestCar = from c in cars
              orderby c.Price
              select first c

我知道 first 关键字实际上并不存在，但是可以说明我想做什么. 我也知道我可以将from ... select语句包装在括号中并直接调用FirstOrDefault ，但我认为上述语法更简洁易读.

I know the first keyword doesn't actually exist but illustrates what I'd like to do. I also know I can wrap the from...select statement in parenthesis and call FirstOrDefault directly but I think the above syntax is cleaner and easier to read.

推荐答案

Enumerable.FirstOrDefault是Enumerable类中的扩展方法之一，它没有相应的LINQ语法元素.绑定到此方法的唯一方法是通过方法调用语法.

Enumerable.FirstOrDefault is one of the extension methods in the Enumerable class which does not have a corresponding LINQ syntax element. The only way to bind to this method is via method call syntax.

您可以通过执行以下操作来避免暂时发生

You can avoid the temporary by doing the follownig

var bestCar = (from c in cars
              orderby c.Price
              select c).FirstOrDefault();

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