DotNetKicks.com - published linq stories

Add a visual Linq expression builder to your app today!

Fri, 03 Feb 2012 23:44:34 GMT

Rabb Moshe Plotkin has created and open-sourced a control for creating Linq queries visually. Using this control, you can give your users the power to query data, rather than writing canned reports or queries.

DevForce LINQPad driver

Wed, 18 Jan 2012 06:14:26 GMT

LINQPad is an enormously helpful development tool for building and executing LINQ queries and C#/VB expressions. In response to customer requests, we've built a DevForce LINQPad driver that lets you use LINQPad with DevForce models. There's no need to struggle with the EF or Universal drivers or add namespaces and assemblies.

A Generic Equality Comparer for LINQ

Tue, 17 Jan 2012 14:26:20 GMT

LINQ operators generally use lambda expressions to control their processing and output. Some operators use IEqualityComparer<T> implementations to compare values. This article describes a generic comparer, driven by delegates, designed for use in queries.

Shuffle in linq (part 2)

Sat, 14 Jan 2012 12:51:32 GMT

There are many times when we need to randomly sort a list or array.

Shuffle in Linq

Sat, 14 Jan 2012 02:26:46 GMT

A simple implementation for shuffling a list in linq.

Monadic Philosophy Part 2 - The LINQ Monad

Fri, 06 Jan 2012 14:40:27 GMT

If you don't come from a math or philosophy background (and I don't) "monad" sounds like a made-up word. Of course, understanding OO's use of terms like "class" and "object" can be hard to grok at first too. But at least those terms have some grounding in real-world concepts that non-math geeks come across. Because I couldn't draw an analogy of monads to anything at first, it made grasping the concept of monads very hard for me.

Sequence contains no elements : LINQ error

Fri, 16 Dec 2011 02:33:10 GMT

Learn how to fix linq and lambda expression error "Sequence contains no elements"

Seeing the SQL Generated by LINQ to Entity Queries -- Visual Studio Ma

Mon, 12 Dec 2011 16:03:46 GMT

Sometimes you really, really, really want to see the SQL that LINQ generates when working with the Entity Framework. There is a really simple way to do this using the immediate window that does not involve installing a profiler.

I've Left Query Analyzer Hell for LINQPad Heaven

Thu, 08 Dec 2011 00:55:13 GMT

extensions for linqpad

Architecting Your Data Access Layer with the Entity Framework

Sat, 03 Dec 2011 03:32:25 GMT

I had the pleasure to co-present with one of my fellow evangelists, Dave Bost, on architecting and developing with the ADO.NET Entity Framework this week. I focused on application architecture topics while Dave focused on developing applications.

[WPF] Using Linq to shape data in a CollectionView

Wed, 30 Nov 2011 14:24:54 GMT

This article describes a way to use Linq to specify the filter, sort and grouping of a WPF CollectionView.

LINQ Pitfalls: Using external variables in projections

Mon, 14 Nov 2011 19:57:20 GMT

One issue with NHibernate.Linq provider that surprised me a lot is about variables (or constants) that appear in Select expressions. It seems that you can use it, but once only! Otherwise you'll experience pretty nasty silent fail.

NHibernate.Linq Pitfalls: Order of operators

Sat, 05 Nov 2011 10:47:55 GMT

When writing SQL queries you need to put all the clauses in particular order that is enforced by the SQL language itself and somehow relates with how the RDBMS is going to process the query. When writing NHibernate's LINQ queries, the rules generally still apply.

entity framework a super dataset

Fri, 04 Nov 2011 15:24:27 GMT

Is entity framework a super dataset?

NHibernate.Linq Pitfalls: Casting

Mon, 31 Oct 2011 15:31:32 GMT

One thing that needs to be always remembered when writing NHibernate.Linq queries is that it is going to be translated into SQL eventually. What this means is that we can't do everything in our Select or Where conditions - we are restricted by the capabilities of underlying database and SQL language itself.

NHibernate.LINQ Pitfalls: Nested queries

Wed, 26 Oct 2011 10:35:10 GMT

NHibernate's LINQ provider is very easy to start with and sufficient for majority of use cases, but when used in more complex scenarios it can mislead and surprise. Here is one of the pitfalls (or perhaps bugs?) I've recently run into.

Linq Join on Mutiple columns using Anonymous type

Wed, 12 Oct 2011 09:06:30 GMT

I was working on the project using LINQ. I got the requirement to join the two entity on multiple column.

Filter a DataTable with LINQ to Objects

Mon, 03 Oct 2011 07:34:45 GMT

Filtering a datatable object with linq without entity framework and thus typesafe columns

WHERE IN (Value1, Value2, Value3, Value4, Value5 .) query using Linq

Fri, 02 Sep 2011 06:43:55 GMT

This example demonstrates how to check multiple values using Linq to find out the required result...

LINQ TO SQL GridView (Enhanced Gridview)

Sun, 28 Aug 2011 14:58:52 GMT

LINQ TO SQL GridView

Dynamic Lambda Expression For Sorting A List / Collection Using Comple

Thu, 25 Aug 2011 20:57:53 GMT

In my previous post we discussed on sorting the list / collection using dynamic lambda expression for properties. In this article we will see how to sort on complex properties. So what is a complex property. Consider the class diagram as shown below In our scenario, we have "Employee" entity, where we have a property "Department" which is a complex type. Now let us assume that we are binding the list of employees list along with the department name, then we will have to use item template along with "Bind" method called.

Dynamic OrderBy using LINQ to SQL

Wed, 24 Aug 2011 20:33:21 GMT

Dynamically ordering your data when using LINQ to SQL as a backend

How to use Any Method with Collection in LINQ

Mon, 22 Aug 2011 01:47:02 GMT

In this article, I will share with you, how to use the Any method in LINQ.We can use this method in two differen ways, one is with collection and another one is without collection.

LINQ - Comparing Count() to Any()

Sun, 21 Aug 2011 15:36:55 GMT

Compares the performance differences and considerations between using Count and Any to determine if any elements in a collection match a filter. A commenter also points out that using Any with an embedded filter gives different performance results as well. While it's important not to prematurely optimize, it is important to consider the points in this article if you write queries like this that run in a tight loop or iterate over large sets of data.

Ordering data in LINQ queries by more than one column

Fri, 19 Aug 2011 18:46:38 GMT

In this post I am going to show how to do ordering when you require to order data by using multiple columns.