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Maker QR-Code in Visual C#.NET The C# Language

The C# Language
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In general, a new executable version of a generic class is created for each constructed type in which the type argument is a value type, such as int or double Thus, each object of Gen<int> will use one version of Gen and each object of type Gen<double> will use another version of Gen, with each version of Gen tailored to the specific value type However, there will be only one version of a generic class that handles all cases in which the type argument is a reference type This is because the size (in bytes) of all references is the same Thus, only one version is needed to handle all types of references This optimization also reduces code-bloat
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Some Generic Restrictions
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Here are a few restrictions that you need to keep in mind when using generics: Properties, operators, indexers, and events cannot be generic However, these items can be used in a generic class and can make use of the generic type parameters of that class The extern modifier cannot be applied to a generic method Pointer types cannot be used as type arguments If a generic class contains a static field, then each constructed type has its own copy of that field This means that each instance of the same constructed type shares the same static field However, a different constructed type shares a different copy of that field Thus, a static field is not shared by all constructed types
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Final Thoughts on Generics
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Generics are a powerful extension to C# because they streamline the creation of type-safe, reusable code Although the generic syntax can seem a bit overwhelming at first, it will quickly become second nature Likewise, learning how and when to use constraints takes a bit of practice, but becomes easier over time Generics are now an integral part of C# programming It s worth the effort it takes to master this important feature
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CHAPTER
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LINQ
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uture generations of programmers will look back on version 30 as a pivotal event in the evolution of C# because it fundamentally and irrevocably reshapes the core of the language The reason for this dramatic impact can be stated in a single acronym: LINQ LINQ adds to C# an entirely new syntactic element, several new keywords, and a powerful new capability The inclusion of LINQ significantly increases the scope of the language, expanding the range of tasks to which C# can be applied Moreover, LINQ has charted the future direction of computer language development because it offers a new way to think about and solve some of the most common, yet challenging problems that face today s programmers Simply put, the integration of LINQ into C# sets a new standard that will affect the course of language design well into the future LINQ is that important
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NOTE LINQ in C# is essentially a language within a language As a result, the subject of LINQ is
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quite large, involving many features, options, and alternatives Although this chapter describes LINQ in significant detail, it is not possible to explore all facets, nuances, and applications of this powerful feature To do so would require an entire book of its own Instead, this chapter focuses on the core elements of LINQ and presents numerous examples It is important to understand that we are just now at the beginning of the LINQ revolution Going forward, LINQ is a subsystem that you will want to study in greater detail
What Is LINQ
LINQ stands for Language-Integrated Query It encompasses a set of features that let 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 Structured Query Language (SQL) Other sources of data, such as XML, required their own approach 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
Part I:
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