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copied!<p>Chapter 11 (Inside Expression Trees) and chapter 12 (Extending Linq) of Programming Microsoft Linq (ISBN 13: 978-0-7356-2400-9 or ISBN 10: 0-7356-2400-3) has been invaluable for me. I haven't read Jons book, but he is a quality guy and explains things well, so I assume that his coverage would also be good.</p> <p>Another great resource is <a href="http://community.bartdesmet.net/blogs/bart/archive/tags/LINQ/default.aspx" rel="noreferrer">Bart De Smet's blog</a> </p> <p>Also, keep your eye on MSDN, the sample code for building a <a href="http://code.msdn.microsoft.com/SimpleLingToDatabase/Release/ProjectReleases.aspx?ReleaseId=1471" rel="noreferrer">Simple Linq to Database</a> (by Pedram Rezaei) is about to get about 40 pages of Doco explaining it.</p> <p>A really, really useful resource for Expression Tree's in fact I would regard it as a <em>must have</em> is the <a href="http://msdn.microsoft.com/en-us/library/bb397975.aspx" rel="noreferrer">Expression Tree Visualiser</a> debugging tool.</p> <p>You should also learn as much as you can about Expression Tree Visitors, there is a pretty good base class inplementation <a href="http://msdn.microsoft.com/en-us/library/bb882521.aspx" rel="noreferrer">here</a>. </p> <p>Here is some sample code derived from that Visitor class to do some debugging (I based this on some sample code in the book I mentioned) the prependIndent method call is just an extension method on a string to put a "--" at each indent level.</p> <pre><code> internal class DebugDisplayTree : ExpressionVisitor { private int indentLevel = 0; protected override System.Linq.Expressions.Expression Visit(Expression exp) { if (exp != null) { Trace.WriteLine(string.Format("{0} : {1} ", exp.NodeType, exp.GetType().ToString()).PrependIndent(indentLevel)); } indentLevel++; Expression result = base.Visit(exp); indentLevel--; return result; } ... </code></pre>

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