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LINQ to CSLA
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ith the introduction of LINQ, the entire language for how we interact with collections of objects, data, XML files, and any other IEnumerable(Of T) structure has been updated. LINQ provides a unified language a single syntax for dealing with diverse structures. It opens many exciting possibilities for reducing the volume of source code. In this chapter, I will show you how to take advantage of the features in LINQ to CSLA in order to reduce the amount of source code you write dealing with CSLA collections. I will then explain the implementation of features in LINQ to CSLA, including indexing and making the results of LINQ queries bindable.
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Consider the following code, written without using LINQ: Dim lateProjects As New List(Of Project)() For Each project As Project In allProjects If project.DueDate < DateTime.Now Then lateProjects.Add(project) End If Next LINQ replaces the previous six lines of code with three lines of code that reveal the intent more clearly: Dim lateProjects = _ From project In allProjects _ Where project.DueDate < DateTime.Now Since a goal of CSLA .NET is to reduce the amount of code you have to write, making CSLA .NET work well with LINQ is a requirement for CSLA .NET 3.5 and higher. In the first example, not only are you stating what you want, but you re also writing exactly how those objects are going to be found. Using LINQ, by contrast, you re writing code at a higher level and specifying what you want (projects where the due date is earlier than now). However, you leave to the collection how you want the query to be handled. By having business code focus on the what rather than on the how, you can allow for further optimizations by the framework. In fact, one optimization in CSLA .NET is a new Indexable attribute on properties of a child class. The Indexable attribute provides hints to the CSLA .NET collection classes about where they might create indexes. The collection classes, in turn, create and maintain indexes on properties in their child classes that are marked Indexable. Any code written the old way because it specified not only what but how would not be able to take advantage of that optimization without recoding. The latter
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CHAPTER 14 LINQ TO C SLA
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example, by contrast, requires no updates when you decide to use indexes with your collection. I ll discuss indexes more in the next section.
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Overview of LINQ to CSLA .NET
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Although LINQ provides some great opportunities, it also presents special challenges to the implementers of frameworks. One of the chief reasons for implementing a business object framework is the reduction of UI code you need to write to implement a solution. Therefore, the ability to bind collections that inherit from BusinessListBase is a critical component of a framework like CSLA .NET.
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Binding to Results from LINQ to Objects
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Just as collections that inherit from BusinessListBase should work properly with binding, so should the results of LINQ queries that are run over collections of BusinessListBase objects. Unfortunately, the result of a standard query from LINQ to Objects is a type called Sequence(Of U). As shown in Figure 14-1, this new collection doesn t have awareness of the collection from which it is generated. This means that operations on the result of the query, such as change tracking and collection-level validation, will fail to work as expected, due to the fact that the new collection has no awareness of the old one.
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Original BusinessListBase
Key Value Value
From x In someCollection_ Where x.SomeVal = 42_ Select x Resulting Projection
Key Value Value
Figure 14-1. Binding from a projection The overall goal in the development of LINQ to CSLA .NET is to make it possible to use LINQ with CSLA .NET collections and have data binding behavior work as expected. Namely, the goal is to make it so that you can bind to the result of a LINQ query performed against a CSLA .NET collection and have all the behavior you would expect when binding to the entire collection itself. Later in this chapter, I ll provide more detail about how this works.
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