Dynamic LINQ (Part 1: Using the LINQ Dynamic Query Library)
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Published: 07 Jan 2008
Unedited - Community Contributed
In the first part of the series, Scott examines the LINQ dynamic query library. You will learn how to download it and also to build a simple application using the library. Scott provides a brief summary of the documentation which ships with the library along with the complete source code in both VB and C# which enables you to test the application he has created.
by Scott Guthrie
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Republished with Permission - Original Article

LINQ (language integrated query) is one of the new features provided with VS 2008 and .NET 3.5.  LINQ makes the concept of querying data a first class programming concept in .NET, and enables you to efficiently express queries in your programming language of choice.

One of the benefits of LINQ is that it enables you to write type-safe queries in VB and C#.  This means you get compile-time checking of your LINQ queries, and full intellisense and refactoring support over your code:

Figure 1

While writing type-safe queries is great for most scenarios, there are cases where you want the flexibility to dynamically construct queries on the fly.  For example: you might want to provide business intelligence UI within your application that allows an end-user business analyst to use drop-downs to build and express their own custom queries/views on top of data. 

Traditionally these types of dynamic query scenarios are often handled by concatenating strings together to construct dynamic SQL queries.  Recently a few people have sent me mail asking how to handle these types of scenarios using LINQ.  The below post describes how you can use a Dynamic Query Library provided by the LINQ team to dynamically construct LINQ queries.

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