Category Archives: LINQ

Thinking Linq

Posted on June 28, 2012 by Chris Missal

I’ve been comfortable using LINQ for what seems like a long time. I’m noticing that I’ve been implementing some of the lesser used functions a bit more as of late, but I’m not sure exactly when they’re appropriate. Take the … Continue reading →

| Comments Off

Queue is Always Empty Using yield return

Posted on May 4, 2011 by Chris Missal

I ran into an issue in a C# application the other day. Thankfully I figured out what was going wrong right away, but it could have turned into a big headache potentially. Post Footer automatically generated by Add Post Footer … Continue reading →

Also posted in StructureMap | Comments Off

Autoprojecting LINQ queries

Posted on February 9, 2011 by Jimmy Bogard

Something I’ve been looking at adding to AutoMapper was the idea of doing automatic query projection in the Select query projection in LINQ statements.  One downside of AutoMapper is that projection from domain objects still forces the entire domain object … Continue reading →

| 22 Comments

What is Projection?

Posted on March 3, 2010 by Chris Missal

I think there’s great benefit in not only knowing how to design your code to use common patterns but also to be able to speak about them clearly and concisely to others. If I mention that the problem sounds like … Continue reading →

Also posted in Uncategorized | Comments Off

Implementing Domain Queries

Posted on January 30, 2010 by John Teague

My current Repository interface looks something like this: public interface IRepository { T FindOne<T>(int id); T FindBy<T>(Expression<Func<T, bool>> expression); IEnumerable<T> FindAllBy<T>(Expression<Func<T, bool>> expression); IEnumerable<T> FindAll<T>(); T FindOneBy<T>(Expression<Func<T, bool>> expression); void Save<T>(T target); void Update<T>(T target); void SaveOrUpdate<T>(T target); void Delete<T>(T … Continue reading →

Also posted in Uncategorized | Comments Off

Selecting Static Results with Dynamic LINQ

Posted on January 23, 2010 by Keith Dahlby

Dynamic LINQ (DLINQ) is a LINQ extension provided in the VS 2008 Samples. Scott Guthrie provides a good overview here: Dynamic LINQ (Part 1: Using the LINQ Dynamic Query Library), but the executive summary is that it implements certain query … Continue reading →

Also posted in CodingDojo, TDD | Comments Off

LINQ query operators and null lists

Posted on December 8, 2009 by Jimmy Bogard

One of my pet peeves with the LINQ extension methods is their inability to handle null source lists.  For example, this will throw an ArgumentNullException: [Test] public void Should_handle_nulls() { List<int> ints = null; ints.Any(num => num < 0).ShouldBeFalse(); } … Continue reading →

| 7 Comments

More missing LINQ operators

Posted on October 16, 2009 by Jimmy Bogard

Continuing an old post on missing LINQ operators, the wonders of extension methods allow us as developers to fill potential holes in LINQ operators.  Whether it’s a Zip method (now included in .NET 4.0), or better methods for IComparer-based operators, … Continue reading →

| 10 Comments

Hacking LINQ Expressions: Join With Comparer

Posted on September 19, 2009 by Keith Dahlby

In this installment of my Hacking LINQ series we’ll take a look at providing an IEqualityComparer for use in a LINQ join clause. The Problem Many of the Standard Query Operators require comparing sequence elements and the default query providers … Continue reading →

Also posted in CodingDojo, TDD | 7 Comments

Hacking LINQ Expressions: Select With Index

Posted on September 15, 2009 by Keith Dahlby

First, a point of clarification: I use LINQ Expressions to mean (Language-INtegrated) Query Expressions (the language feature) rather than Expression Trees (the .NET 3.5 library in System.Linq.Expressions). So what do I mean by “Hacking LINQ Expressions”? Quite simply, I’m not … Continue reading →

Also posted in Uncategorized | 12 Comments