背景:在接下来的一个月里,我将做三次关于LINQ的演讲,或者至少将LINQ包含在c#的上下文中。我想知道哪些话题值得花相当多的精力,这取决于人们可能很难理解哪些话题,或者他们可能有错误的印象。我不会具体讨论LINQ to SQL或实体框架,只是作为如何使用表达式树(通常是IQueryable)远程执行查询的示例。

那么,你发现LINQ有什么难的地方吗?在误解方面你看到了什么?例子可能是以下任何一个,但请不要限制自己!

c#编译器如何处理查询表达式 Lambda表达式 表达式树 扩展方法 匿名类型 这个IQueryable 延迟执行与立即执行 流与缓冲执行(例如,OrderBy被延迟但被缓冲) 隐式类型局部变量 读取复杂的泛型签名(例如Enumerable.Join)


当前回答

编译查询

The fact that you can't chain IQueryable because they are method calls (while still nothing else but SQL translateable!) and that it is almost impossible to work around it is mindboggling and creates a huge violation of DRY. I need my IQueryable's for ad-hoc in which I don't have compiled queries (I only have compiled queries for the heavy scenarios), but in compiled queries I can't use them and instead need to write regular query syntax again. Now I'm doing the same subqueries in 2 places, need to remember to update both if something changes, and so forth. A nightmare.

其他回答

Explain why Linq does not handle left outer join as simple as in sql syntax. See this articles: Implementing a Left Join with LINQ, How to: Perform Left Outer Joins (C# Programming Guide) I got so disappointed when I came across this obstacle that all my respect for the language vanished and I decedid that it was just something that quickly would fade away. No serious person would want to work with a syntax that lacks these battlefield proven primitives. If you could explain why these sort of set operation are not supported. I would become a better and more openminded person.

哪个更快,内联Linq-to-Sql还是使用Tsql spprocs的Linq-to-Sql

... 是否有使用服务器端(Sproc)或客户端(内联Linq)查询更好的情况。

我对LINQ还是个新手。以下是我第一次尝试时遇到的问题

将多个查询合并为一个查询 在Visual Studio中有效地调试LINQ查询。

理解Linq提供者之间的抽象何时泄漏。有些东西适用于对象,但不适用于SQL(例如,. takewhile)。一些方法可以被翻译成SQL (ToUpper),而另一些则不能。有些技术在对象中更有效,而其他技术在SQL中更有效(不同的连接方法)。

我最初没有意识到的是,LINQ语法不需要IEnumerable<T>或IQueryable<T>来工作,LINQ只是关于模式匹配。

可选文字 http://bartdesmet.info/images_wlw/QIsIQueryabletheRightChoiceforMe_13478/image_thumb_3.png

这就是答案(不,那篇博客不是我写的,是Bart De Smet写的,他是我发现的LINQ上最好的博主之一)。