Regardless of the type of application you are creating using the .NET platform, your program will certainly need to access some form of data as it executes. To be sure, data can be found in numerous locations, including XML files, relational databases, in-memory collections, and primitive arrays. Historically speaking, based on the location of said data, programmers needed to make use of different and unrelated APIs. The Language Integrated Query (LINQ) technology set, introduced initially in .NET 3.5, provides a concise, symmetrical, and strongly typed manner to access a wide variety of data stores. In this chapter, you will begin your investigation of LINQ by focusing on LINQ to Objects.
Before you dive into LINQ to Objects proper, the first part of this chapter quickly reviews the key C# programming constructs that enable LINQ. As you work through this chapter, you will find that implicitly typed local variables, object initialization syntax, lambda expressions, extension methods, and anonymous types will be quite useful (if not occasionally mandatory).
After this supporting infrastructure is reviewed, the remainder of the chapter will introduce you to the LINQ programming model and its role in the .NET platform. Here, you will come to learn the role of query operators and query expressions, which allow you to define statements that will interrogate a data source to yield the requested result set. Along the way, you will build numerous LINQ examples that interact with data contained within arrays as well as various collection types (both generic and nongeneric) and understand the assemblies,
, and types that represent the LINQ to Objects API.
Before you dive into LINQ to Objects proper, the first part of this chapter quickly reviews the key C# programming constructs that enable LINQ. As you work through this chapter, you will find that implicitly typed local variables, object initialization syntax, lambda expressions, extension methods, and anonymous types will be quite useful (if not occasionally mandatory).
After this supporting infrastructure is reviewed, the remainder of the chapter will introduce you to the LINQ programming model and its role in the .NET platform. Here, you will come to learn the role of query operators and query expressions, which allow you to define statements that will interrogate a data source to yield the requested result set. Along the way, you will build numerous LINQ examples that interact with data contained within arrays as well as various collection types (both generic and nongeneric) and understand the assemblies,
, and types that represent the LINQ to Objects API.
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