方法链可以称为LINQ吗? [英] Can a method chain be called LINQ?

问题描述

将此代码段称为LINQ(语言集成查询)是否正确?

Is it correct to call this code snippet LINQ (Language Integrated Query)?

var lstMyStrings = new List<string>();
lstMyStrings.Where(aX => string.IsNullOrEmpty(aX))
            .Skip(3)
            .ToList();

我很困惑，因为对于此代码，必须 System.Linq .
但是，当我看到这样的问题和答案时: .NET LINQ查询语法与方法链 ，那么他们在谈论方法链而不是LINQ.

I am confused because System.Linq is mandatory for this code.
However, when I see questions and answer's like this: .NET LINQ query syntax vs method chain , then they're talking explicit about a method chain and not LINQ.

推荐答案

LINQ可以用两种不同的方式编写.
一种是通过使用LINQ声明性查询语法编写查询:

LINQ can be written in two different ways.
One is by writing a query using LINQ declarative query syntax:

var query = from x in source
            where condition
            select x.Property

另一个是通过使用LINQ的扩展方法:

And the other is by using LINQ's extension methods:

var query = source.Where(condition).Select(x => x.Property);

这两个查询是相同的，并且将产生相同的结果(嗯，在这个过于简化的示例中，编译器错误，但是考虑到这一点:-))

Both queries are identical and will produce the same result (well, compiler error in this over-simplified example but it's the thought that counts :-))

c#编译器将查询转换为方法调用.
这意味着您还可以使用方法链来编写您作为查询编写的所有内容.但是请注意，相反的说法是错误的-某些查询只能使用Linq的扩展方法编写.

The c# compiler translates the query into method calls.
This means that everything you write as a query can be also written using method chains. Please note, however, that the opposite is false - Some queries can only be written using Linq's extension methods.

要进一步阅读，请请注意第二段以此开头:

Note the second paragraph starts with this:

查询语法和方法语法在语义上是相同的，但是许多人发现查询语法更简单，更易于阅读.

Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read.

btw，如果尚不清楚，则System.Linq是方法链接语法必需的原因也是因为linq扩展方法属于该命名空间.

btw, if it was'nt already clear, the reason that System.Linq is mandatory for the method chaining syntax also is because the linq extension methods belongs to this namespace.

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