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This article mainly introduces how to use LINQ query, 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.

.net Language Integrated Query (LINQ): adopt a common solution to solve the problem of access and integration of various information sources. For the LINQ project, we have taken a more general approach and added a general query tool to the .NET Framework for all information sources (not just relational data or XML data), rather than adding relevant or XML-specific functions to the programming language and runtime. The tool is called .NET language Integrated query (LINQ).

Language-integrated queries enable query expressions to benefit from rich metadata, compile-time syntax checking, static input, and IntelliSense. We use the term language integration query to indicate that this query is an integration feature of the developer's main programming language (for example, C #, Visual Basic). Language-integrated queries enable query expressions to benefit from rich metadata, compile-time syntax checking, static input, and IntelliSense (previously used only for command code). Language integrated queries also allow a single common declarative query tool to be applied to all in-memory information, not just information from external sources

Standard query operators that allow operations such as traversal, filtering, and projection through direct declaration in any .NET-based programming language. There are two sets of LINQ standard query operators, one running on an object of type IEnumerable (Of (T)) (running on an in-memory collection), the returned enumerable object capturing the parameters passed to the method, and the other set of methods running on an object of type IQueryable (Of (T)) that extends IQueryable) do not implement any query behavior, but generate an expression tree that represents the query to be executed

◆ LINQ to Objects: refers to using LINQ queries directly against any IEnumerable or IEnumerable (Of (T)) collection without using an intermediate LINQ provider or API, such as LINQ to SQL or LINQ to XML. You can use LINQ to query any enumerable collection, such as List (Of (T)), Array, or Dictionary (Of (TKey, TValue)). The collection can be a user-defined collection or a collection returned by the .NET Framework API.

◆ LINQ to XML: provides an in-memory XML programming interface for integrating query (LINQ) Framework using the .NET language. LINQ to XML uses the .NET Framework language functionality of * *, which is equivalent to the updated and redesigned document object Model (DOM) XML programming interface.

◆ LINQ to ADO.NET: you can query any enumerable object in ADO.NET using the language Integrated query (LINQ) programming model

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