LINQ in Action - THE LINQ book

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• Hex Dump using LINQ (in 7 Lines of Code)

  At one point while debugging the HtmlConverter class , when I found certain situations in the XML, I wanted to dump the XML in binary to see the actual hex values of characters being used. I got tired of stopping and examining the values in the debugger. Read More... Posted Friday, March 12, 2010 7:15 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, Functional Programming, C#

• Ad-Hoc String Concatenation using LINQ

  I regularly use functional programming and LINQ in two contexts – when writing code that is part of an example or tool that will potentially execute millions of times, and when writing ad-hoc queries. These days, I use C# and LINQ as my ‘scripting language’, Read More... Posted Wednesday, March 10, 2010 7:14 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, Functional Programming, C#

• Rollup Extension Method: Create Running Totals using LINQ to Objects

  Recently, I had need for a new extension method for IEnumerable<T>, which I call "Rollup". This extension method is sort of a cross between the Select and Aggregate extension methods. Like Select, when using this extension method you write a lambda Read More... Posted Monday, February 15, 2010 9:53 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, LINQ to XML, Functional Programming, C#

• Writing Entity References using LINQ to XML

  I need to write out some XHtml, and in several places, I want that XHtml to contain entities references. However, you can't simply write the entitle reference like this: XElement p = new XElement ( "p" , "  Hello" ); Console .WriteLine(p); Read More... Posted Thursday, January 21, 2010 8:35 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, xml, LINQ to XML, Functional Programming

• DescendantsAndSelfTrimmed LINQ to XML Axis Method

  [Blog Map] There are some circumstances where I need a variation on the DescendantsAndSelf axis method that allows me to specify that specific elements (and the descendants of those elements) are ‘trimmed’ from the returned collection. One of the things Read More... Posted Wednesday, August 19, 2009 12:01 PM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, xml, LINQ to XML, Useful Code Snippets, Functional Programming

• Merging Comments from Multiple Open XML Documents into a Single Document

  Microsoft Word 2007 allows you to lock a document, prohibiting users from making changes to content, while allowing them to add comments. If we have multiple documents that have the same content yet different comments, we can merge those comments into Read More... Posted Monday, July 27, 2009 4:14 PM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, OpenXML, LINQ to XML, OpenXmlSdk, Useful Code Snippets, Functional Programming

• A Tutorial in the Recursive Approach to Pure Functional Transformations of XML

  [Blog Map] Writing pure functional transformations a in a recursive style enables us to put together interesting transformations in a very small amount of code. Using some specific techniques that allow us to write this code very concisely, this approach Read More... Posted Monday, July 20, 2009 6:28 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, xml, OpenXML, LINQ to XML, Useful Code Snippets, Functional Programming, C#

• Document-Centric Transforms using LINQ to XML

  [Blog Map] When thought of in a certain way, XML documents come in two flavors – data-centric and document-centric. Further, there are two types of document-centric documents. This post presents my thoughts about approaches to various types of document-centric Read More... Posted Thursday, July 09, 2009 11:16 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, xml, OpenXML, LINQ to XML, OpenXmlSdk, Useful Code Snippets, Functional Programming

• Comparing Two Open XML Documents using the Zip Extension Method

  [BlogMap] Sometimes we want to compare two word processing documents to see if they contain the same content. I’m working on a blog post to merge comments from multiple Open XML documents into a single document. This is based on a feature in Word 2007 Read More... Posted Sunday, July 05, 2009 9:09 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, OpenXML, LINQ to XML, OpenXmlSdk, Useful Code Snippets, Functional Programming

• Querying LINQ to XML Nodes in Reverse Document Order with Better Performance

  Occasionally I need to query LINQ to XML nodes in reverse document order. I’m currently writing some LINQ to XML queries over Open XML documents where I need to select paragraph nodes based on content in the immediately preceding paragraph. However, nodes Read More... Posted Wednesday, June 24, 2009 10:25 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, OpenXML, LINQ to XML, Useful Code Snippets, Functional Programming

• Working with Optional Elements and Attributes in LINQ to XML Queries

  Often XML schemas allow for optional elements and attributes. When you write queries on these elements or attributes, you may be tempted to write code that does lots of testing for null. There is a better way to do this, laid out in this post. I covered Read More... Posted Wednesday, May 13, 2009 9:02 PM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, xml, LINQ to XML, Functional Programming

• LINQ / Open XML at TechEd 2009

  I’ll be presenting a talk on LINQ and Open XML at TechEd 2009. The session is “OFC403 Developing Office Client Solutions Using LINQ and Open XML”. I’ll be presenting on Thursday, 5/14, at 4:30PM in Room 411. Here is the abstract for the talk: In this Read More... Posted Monday, May 04, 2009 3:44 PM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, OpenXML, LINQ to XML, SharePoint, OpenXmlSdk, Functional Programming

• Using DocumentBuilder with Content Controls for Document Assembly

  DocumentBuilder is an example class that’s part of the PowerTools for Open XML project that enables you to assemble new documents from existing documents. One of the problems to solve when moving markup from one document to another is that of interrelated Read More... Posted Tuesday, April 21, 2009 5:43 AM from Eric White's Blog : LINQ | (Comments Off) Filed under: LINQ, OpenXML, LINQ to XML, PowerTools, OpenXmlSdk, Functional Programming

• Why I Don’t Use the ForEach Extension Method

  In my first version of my functional programming tutorial , I discussed a ForEach extension method, but I removed the topic from the second version. This extension method iterates through a source collection and performs an action on each item in the collection. ForEach isn’t included in the .NET base class library (BCL), but its implementation is pretty simple: static class MyExtensions { static void ForEach<T>( this IEnumerable <T> source, Action <T> action) { foreach (T item Read More... Posted Wednesday, April 08, 2009 8:15 AM from Eric White's Blog | (Comments Off) Filed under: LINQ, LINQ to XML, FP Tutorial, Functional Programming

• Ease of Maintenance of LINQ Code (2)

  [Blog Map] In two previous posts, I developed a somewhat involved query to search through a word processing document for style names and/or paragraph content. This is a query that I’m developing for the PowerTools for Open XML project . In those posts, as I evolved the query, I showed each iteration of it, highlighting the changes I made. This post continues modifying that query: First, I added a few tests that cause complete code coverage given the attached source document. Second, I changed the Read More... Posted Sunday, February 22, 2009 1:50 AM from Eric White's Blog | (Comments Off) Filed under: LINQ, OpenXML, LINQ to XML, OpenXmlSdk, Useful Code Snippets, Functional Programming