2: Getting Started in C#.NET

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2: Getting Started
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LINQ to SQL is the subject of several weighty chapters at the heart of this book Using LINQ to write SQL queries is a very important subject, and one that will be explored in considerable depth This chapter includes only the minimum code necessary to introduce you to the topic You also had a quick look at LINQ to XML You saw that the class contains a method called that can be used to discover a particular node type in a document When converted into LINQ to XML, , and they frequently contain these nodes typically are of type In 13, you will learn more about subnodes of type these types and how to use them when you parse, transform, and create XML documents This chapter gave you just enough information to help you understand the basics of LINQ In the next chapter, you will learn about the theoretical foundation on which LINQ is built The practical knowledge in this chapter, and the theoretical knowledge found in the next chapter, will give you a strong foundation on which to begin an in-depth study of how to use LINQ to query data
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The Essence of LINQ
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several practical examples of LINQ s syntax, it is time to view the technology from a more theoretical perspective This chapter covers the seven foundations on which an understanding of LINQ can be built LINQ is Integrated Unitive Extensible Declarative Hierarchical Composable Transformative These ideas may sound esoteric at rst, but I believe you will nd them quite easy to understand LINQ has a fundamental simplicity and elegance In this chapter and the next, we explore LINQ s architecture, giving you a chance to understand how it was built and why it was built that way This chapter explains goals that LINQ aims to achieve The next chapter explains each of the pieces of the LINQ architecture and shows how they come together to achieve those goals
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3: The Essence of LINQ
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LINQ stands for Language Integrated Query One of the central, and most important, features of LINQ is its integration of a exible query syntax into the C# language Developers have many tools that have been crafted to neatly solve dif cult tasks Yet there are still dark corners in the development landscape Querying data is one area in which developers frequently encounter problems with no clear resolution LINQ aims to remove that uncertainty and to show a clearly de ned path that is well-lit and easy to follow In Visual Studio 2005, attempts to query data in a SQL database from a C# program revealed an impedance mismatch between code and data SQL is native to neither NET nor C# As a result, SQL code embedded in a C# program is neither type-checked nor IntelliSense-aware From the perspective of a C# developer, SQL is shrouded in darkness Here is an example of one of several different techniques developers used in the past when querying data:
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Of these six lines of code, only the last two directly de ne a query The rest of the lines involve setup code that allows developers to connect and call objects in the database The query string shown in the next-to-last line is neither type-checked nor IntelliSense-aware After these six lines of code execute, the developers may have more work to do, because the data returned from the query is not readily addressable by an object-oriented programmer You might have to write more lines of code to access this data, or convert it into a format that is easier to use The LINQ version of this same query is shorter, easier to read, colorcoded, fully type-checked, and IntelliSense-aware The result set is cleanly converted into a well-de ned object-oriented format:
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