By John Paul Mueller
If you’ve requested your self “Why can’t I enhance 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 supplies a radical evaluate of LINQ, from knowing the initiatives 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 cross approximately getting access to facts, and the way to jot down extra effective functions with much less code utilizing LINQ. There’s additionally transparent assistance on combining third-party companies with LINQ to create much more robust apps. With this unmarried, accomplished advisor, you’ll detect how to:
- Use one question language with all Microsoft languages
- Examine .NET language extensions and paintings with extension tools, partial tools, lambda expressions, and question expressions
- LINQ to DataSet operators, SQL server operations, XML API, or lively Directory
- Deal with databases — obtain and set up the Northwind database, generate Northwind entity periods, and create the Northwind XML mapping file
- Create the partial classification instance, the partial procedure instance, and the database amendment example
- Use items with LINQ
- Query databases in visible easy and C#
As an further bonus, you could stopover at the significant other site for LINQ examples in C# and visible uncomplicated. With LINQ For Dummies, you’ll hyperlink up with LINQ very quickly and notice how one can question nearly anything!
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Extra resources for LINQ for dummies
The answer is in your debugger. The next time the debugger works with the query, it goes directly to the select part of the query instead of returning to the orderby portion of the query. Figure 2-7 shows the output from this example. Figure 2-7: Grouped output makes it easier to find a particular value. Creating Queries from Multiple Sources Most developers aren’t going to perform single-source queries, especially when working with databases. You can create queries from any number of sources when working with LINQ.
The “Understanding Collection Initializers” section of this chapter provides a basic collection initializer example to get you started. 49 50 Part I: An Overview of LINQ ߜ IEnumerable and IEnumerable
The partial method has a lot of different uses, but for LINQ developers, the major use for partial methods is to work with events such as OnChange(), OnCreated(), or On[PropertyName]Change(). You see functional examples of partial methods in Chapters 8 and 9. However, to see a simple example of how this feature works, look at the example in the “Working with Partial Methods” section of this chapter. ߜ Object initializers: With the introduction of anonymous data types, C# needed a way to initialize variables without specifying a type.