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This article mainly introduces LINQ how to achieve query operation, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

LINQ, language-level integrated query (Language INtegrated Query)

After the last 20 years, the application of object-oriented programming technology (object-oriented (OO) programming technologies) in the industrial field has entered a stable development stage. Programmers now agree with language features such as classes, objects, and methods. Looking at the current and next generation technologies, a major challenge of a new programming technology begins to emerge, that is, since the birth of object-oriented technology, it has not solved the problem of reducing the complexity of accessing and integrating information data (accessing and integrating information). Two of the most accessible data sources are related to databases (database) and XML.

LINQ provides a more general way to add some multi-purpose (general-purpose) syntax query features (query facilities) to .net Framework that can be applied to all information sources (all sources of information), which is a better way than adding relational data (relational) features or similar XML features (XML-specific) to the development language and runtime (runtime). These grammatical features are called the .NET Language Integrated Query (LINQ).

Contains DLinq and XLinq

The LINQ query operation consists of the following three different operations:

1. Get the data source.

two。 Create a query.

3. Execute the query.

/ / The Three Parts of a LINQ Query: / / 1. Data source. Int [] numbers = new int [7] {0,1,2,3,4,5,6}; / / 2.Query creation. / / numQuery is an IEnumerable var numQuery = from num in numbers where (num% 2) = = 0 select num; / / 3.Query execution. Foreach (int num in numQuery) {Console.Write ("{0jue 1}", num);} Thank you for reading this article carefully. I hope the article "how to achieve query Operation in LINQ" shared by the editor will be helpful to everyone. At the same time, I also hope that you will support and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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