pdf417 barcode generator c# Identity Projections and LinqBindingList<T> in C#.NET

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Identity Projections and LinqBindingList<T>
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An identity projection is a query in which the result of the query contains items of the same type as the source collection. In CSLA .NET 3.5 and higher, identity projections are handled in a special way that allows for binding to the projection. CSLA .NET changes the behavior of queries such that if you run an identity projection over BusinessListBase, you will get a result known as a LinqBindingList<T>.
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Understanding LinqBindingList
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The best way to understand LinqBindingList is to think about it as a filter over BusinessListBase. When you remove an item from a LinqBindingList, it not only removes the item from the list, but
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CHAPTER 14 LINQ TO C SLA
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it removes the item from the source list, and it removes any other LinqBindingList instances from queries generated earlier from the same source BusinessListBase, as shown in Figure 14-2. If you change a property in an item from within the LinqBindingList, the n-level undo mechanism in BusinessListBase will track the change.
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Figure 14-2. Relationships between BusinessListBase and derived instances of LinqBindingList Adding an item to a LinqBindingList is possible, but only items that meet the criteria that were present upon creating the list using LINQ will appear in the LinqBindingList. On the other hand, adding an item to a LinqBindingList adds the item to the original list as well as any other LinqBindingList instances that resulted from queries against the original collection of business objects. In the event that you decide to do a query from a LinqBindingList, another list of type LinqBindingList will be generated. It will act as though it were generated from the original list not the sublist and will exhibit all the behaviors described previously. LinqBindingList is a class that is only ever meant to be produced from an identity projection performed over a class that derives from BusinessListBase. In this respect, it is similar to the Sequence class that LINQ to Objects provides, in that it is strictly the result of a LINQ query and not a structure that you would ever create outside of this context.
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CHAPTER 14 LINQ TO C SLA
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Overview of Indexed Search Using CSLA .NET
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When searching for items in a BusinessListBase- or ReadOnlyListBase-based list, CSLA .NET is capable of doing an optimized search using an internal index if your child class marks the properties you are searching on as Indexable. When either of the main collection classes in CSLA .NET encounters a child class with an Indexable attribute on a property, an internal index is built the first time a search using LINQ is conducted on that class. In cases where the property that is considered Indexable is IComparable, the indexing mechanism is a red-black tree. In cases where the property to be indexed is not IComparable (such as Color), the indexing mechanism is based on Dictionary<T>. Common IComparable property types that tend to be indexed are String, int, and DateTime, although others with custom IComparable implementations are possible.
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Note CSLA .NET supports the ability to plug in your own indexing provider via the IndexingProvider property on BusinessListBase and ReadOnlyListBase. Note that doing so is not for the faint of heart. I provide more information about how to implement such a provider at the end of this chapter.
In either case, it is important to understand that all optimizations come at a cost. By implementing indexing on your objects, you are making add, remove, and update operations slower on your objects, and, in exchange, gaining tremendous benefits for optimization of searches. When you use indexing properly on large collections of business objects in memory on fields where comparison is a costly operation (such as strings), you can gain performance improvements that are several orders of magnitude faster. However, using indexing on fields that are not searched frequently and/or are updated frequently can actually cause performance to degrade. It is critical to have a sense for how you re going to use your child class when you start to use the Indexable attribute on properties within it, just like you would be careful about how you apply an index to a database table.
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