Read e-book online LINQ for dummies PDF

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 consultant delivers a radical evaluation of LINQ, from knowing the projects it plays to creating LINQ paintings with either visible simple and visible Studio 2005. It explains the 4 LINQ services within the .NET Framework, the simplest how one can move approximately having access to information, and the way to jot down 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, finished advisor, you’ll realize how to:

  • Use one question language with all Microsoft languages
  • Examine .NET language extensions and paintings with extension tools, partial equipment, 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 sessions, and create the Northwind XML mapping file
  • Create the partial type instance, the partial process instance, and the database amendment example
  • Use gadgets with LINQ
  • Query databases in visible easy and C#

As an further bonus, you could stopover at the significant other website for LINQ examples in C# and visible easy. With LINQ For Dummies, you’ll hyperlink up with LINQ very quickly and notice how one can question nearly anything!

Note: CD-ROM/DVD and different supplementary fabrics aren't incorporated as a part of e-book file.

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Extra resources for LINQ for dummies

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You add one from keyword for each data source you want to include in a query. Here’s an example of the from keyword in use. var ThisQuery = from StringValue in QueryString select StringValue; The query requires four lines, each of which has a different purpose. The first line is a variable that eventually holds the query. Even a simple query includes an IEnumerator object that you can use to select individual query values. Don’t worry too much about how this works for now — you’ll see a description of the technique that LINQ uses in the “Creating a Simple from Query” section of the chapter.

Var ThisQuery = from StringValue in QueryString select StringValue; The query requires four lines, each of which has a different purpose. The first line is a variable that eventually holds the query. Even a simple query includes an IEnumerator object that you can use to select individual query values. Don’t worry too much about how this works for now — you’ll see a description of the technique that LINQ uses in the “Creating a Simple from Query” section of the chapter. The “Using the var Keyword” section of Chapter 3 describes the var keyword in greater detail.

Listing 2-1 shows the code you’ll need. You’ll also find this example in the \Chapter 02\SimpleFromQuery folder of the source code for this book. 29 30 Part I: An Overview of LINQ Listing 2-1 Performing a Simple Query private void btnTest_Click(object sender, EventArgs e) { // Create an array as a data source. String[] QueryString = { “One”, “Two”, “Three”, “Four”, “Five” }; // Define the query. var ThisQuery = from StringValue in QueryString select StringValue + “\r\n”; // Display the result. Text + ThisValue; } The example begins by creating an array containing some simple text.

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