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This article mainly explains the "LINQ query expression example analysis", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "LINQ query expression example analysis" bar!

LINQ makes querying a first-class programming concept in A. NET, and the data being queried can be XML (LINQ to XML), Databases (LINQ to SQL, LINQ to Dataset, LINQ to Entities), and LINQ to Objects. LINQ is also extensible, allowing you to create custom LINQ data providers (such as LINQ to Amazon, LINQ to NHibernate, LINQ to LDAP). Here I will discuss some of the new language features and improvements in Cellular 3.0 that make LINQ so powerful.

LINQ query expressions provide a language-integrated syntax for query, much like relational and hierarchical query languages such as SQL and XQuery. Writing queries using the LINQ operator (that is, from...where...select) is convenient, and Visual Studio provides good IntelliSense and compile-time inspection support. When the C # compiler encounters a LINQ query expression, it is actually converted to a method call that uses extension methods and Lambda expressions.

Let's give an example to explain this:

Var result = from c in

Customers

Where c.City.StartsWith ("B")

Orderby c.LastName

Select new {c.FirstName, c.LastName, c.Address}

/ / the above code is equivalent to:

Var result = Customers.Where (c = > c.City.StartsWith ("B")).

OrderBy (c = > c.LastName).

Select (c = > new {.firstName, c.LastName, c.Address})

The advantage of using query syntax is that it makes the code simpler and easier to read. Also notice that the LINQ query expression begins with from and ends with select or group.

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