By John Paul Mueller
If you’ve requested your self “Why can’t I strengthen database and XML queries in a language I already know?”, then Language built-in question, or LINQ, is for you. LINQ For Dummies introduces you to LINQ and the .NET Framework applied sciences, so that you can use LINQ to question any item, any info set, any type of XML, and SQL Server—no questions requested.
This plain-English advisor can provide an intensive evaluation of LINQ, from realizing the projects it plays to creating LINQ paintings with either visible simple and visible Studio 2005. It explains the 4 LINQ prone within the .NET Framework, the simplest how you can pass approximately having access to info, and the way to put in writing extra effective functions with much less code utilizing LINQ. There’s additionally transparent advice on combining third-party companies with LINQ to create much more strong apps. With this unmarried, accomplished advisor, you’ll become aware of how to:
- Use one question language with all Microsoft languages
- Examine .NET language extensions and paintings with extension equipment, partial equipment, lambda expressions, and question expressions
- LINQ to DataSet operators, SQL server operations, XML API, or energetic Directory
- Deal with databases — obtain and set up the Northwind database, generate Northwind entity sessions, and create the Northwind XML mapping file
- Create the partial type instance, the partial strategy instance, and the database amendment example
- Use items with LINQ
- Query databases in visible uncomplicated and C#
As an additional bonus, you could stopover at the significant other site for LINQ examples in C# and visible easy. With LINQ For Dummies, you’ll hyperlink up with LINQ very quickly and spot how one can question virtually anything!
Note: CD-ROM/DVD and different supplementary fabrics should not incorporated as a part of publication file.
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Extra resources for LINQ for dummies
Chapter 2: Creating Simple LINQ Queries The custom version isn’t elegant, but it does the job. It begins by creating a new array that matches the data type of the source data. The code initializes the array and a counter used to track the current Results array element. The foreach loop processes the source array. Whenever the source array contains a value that matches the criteria, it places the value in the Results array. When the processing is complete, the code passes the array back to the caller.
Lambda expressions: The lambda expression isn’t a new idea. In fact, it’s been around since Alonzo Church and Stephen Cole Kleene conceived it in 1936 and appears in languages such as LISP (LISt Processing), Scheme, and Haskell. You use lambda expressions as a means of defining an algorithm. In C#, you use lambda expressions to pass an algorithm to a method to perform tasks based on the algorithm, rather than using static values, lists, objects, or other means. ߜ Query expressions: It’s important to understand that the SQL-like syntax used for most of the examples in this book requires translation because C# doesn’t support this syntax natively as part of the language.
Most other operators provide special functionality that you may never need. This chapter reviews the standard operators available to all LINQ to providers. You’ll find other operators discussed in chapters that describe a specific provider. By combining keywords and operators, you can query, file, and group data from one or more data sources. In some cases, you can also manipulate the data in some way — a topic discussed in later chapters (starting with Chapter 6) because data manipulation is provider specific.