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LINQ stands for language-integrated query It encompasses a set of features that lets you retrieve information from a data source As you may know, the retrieval of data constitutes an important part of many programs For example, a program might obtain information from a customer list, look up product information in a catalog, or access an employee s record In many cases, such data is stored in a database that is separate from the application For example, a product catalog might be stored in a relational database In the past, interacting with such a database would involve generating queries using SQL (Structured Query Language) Other sources of data, such as XML, required their own approaches Therefore, prior to C# 30, support for such queries was not built into C# LINQ changes this LINQ adds to C# the ability to generate queries for any LINQ-compatible data source Furthermore, the syntax used for the query is the same, no matter what data source is used This means that the syntax used to query data in a relational database is the same as that used to query data stored in an array, for example It is no longer necessary to use SQL or any other non-C# mechanism The query capability is fully integrated into the C# language In addition to using LINQ with SQL, LINQ can be used with XML files and ADONET datasets Perhaps equally important, it can also be used with C# arrays and collections (described in 15) Therefore, LINQ gives you a uniform way to access data This is a powerful, innovative concept It is not only changing the way that data is accessed, it also offers a new way to think about and approach old problems In the future, many types of programming solutions will be crafted in terms of LINQ Its effects will not be limited to just database access LINQ is supported by a set of interrelated features, including the query syntax added to the C# language, lambda expressions, anonymous types, and extension methods All are examined in this chapter
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At the core of LINQ is the query A query specifies what data will be obtained from a data source For example, a query on a customer mailing list might request the addresses of all customers that reside in a specific city, such as Chicago or Tokyo A query on an inventory database might request a list of out-of-stock items A query on a log of Internet usage could ask for a list of the websites with the highest hit counts Although these queries differ in their specifics, all can be expressed using the same LINQ syntactic elements
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After a query has been created, it can be executed One way this is done is by using the query in a foreach loop Executing a query causes its results to be obtained Thus, using a query involves two key steps First, the form of the query is created Second, the query is executed Therefore, the query defines what to retrieve from a data source Executing the query actually obtains the results In order for a source of data to be used by LINQ, it must implement the IEnumerable interface There are two forms of this interface: one generic, one not In general, it is easier if the data source implements the generic version, IEnumerable<T>, where T specifies the type of data being enumerated The rest of the chapter assumes that a data source implements IEnumerable<T> This interface is declared in SystemCollectionsGeneric A class that implements IEnumerable<T> supports enumeration, which means that its contents can be obtained one at a time in sequence All C# arrays support IEnumerable<T> Thus, we can use arrays to demonstrate the central concepts of LINQ Understand, however, that LINQ is not limited to arrays
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