Fundamentals of engineering programming with C and Fortran by Harley R Myler

By Harley R Myler

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At this point, for all of the code here, nothing has happened yet. That’s right, until the query is accessed, nothing happens through the magic of deferred execution. LINQ has constructed a query expression, but nothing has talked to the database; there is no XML in memory, nada. Once the WriteTo method is called on the bigSpenders query expression, then the query is evaluated by LINQ to SQL, and the XML is constructed. Log, property,” “DataContext class,” “XElement class,” and “LINQ to SQL” topics in the MSDN documentation.

Take is the equivalent to TOP in SQL. Sum(order => order. TotalSpend))); It is much easier to build large-nested queries as individual queries first and then put them together once you are sure the inner query is working. At this point, for all of the code here, nothing has happened yet. That’s right, until the query is accessed, nothing happens through the magic of deferred execution. LINQ has constructed a query expression, but nothing has talked to the database; there is no XML in memory, nada.

You want to be able to query your configuration files for sets of information. Solution Use LINQ to query against the configuration sections. NET-based applications. It can be challenging to get all of the various settings right in the hierarchy of configuration files that can affect an 20 | Chapter 1: Language Integrated Query (LINQ) application, so understanding how to write utilities to programmatically check configuration file settings is of great use during development, testing, deployment, and ongoing management of an application.

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