qr code generator asp net c# Managing the Index Set in Visual Basic .NET

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Managing the Index Set
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Indices are maintained on fields that are marked with the Indexable property under circumstances described earlier in this chapter. These indices are managed through the _indexSet field, which is an object that conforms to the IIndexSet interface. The index set hooks into the collection by being made aware of all changes, additions, and removals that can affect the index. Calls to methods on the _indexSet are made throughout BusinessListBase and ReadOnlyListBase, making it possible for the _indexSet to maintain itself.
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Implementations of IIndex
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Depending on the nature of your child object, you can find items in a list quickly in several ways. As mentioned previously, you can organize those child objects that are comparable that is, where someObj.SomeVal < x has meaning and is implemented in a way that makes that query faster. CSLA .NET uses a balanced tree structure a red-black tree to perform this function. Other child objects that are not IComparable (such as Color) use a dictionary-based index instead. One of the responsibilities of the index set is to choose an appropriate implementation of IIndex based on the type of object being indexed. An ideal indexing strategy allows not only for equality-based queries to use the index but also for range-based queries to use the index.
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Indices on IComparable Properties: Red-Black Tree
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The red-black tree structure allows you to infer the order of the items. All items to the left of a given node in the tree are guaranteed to be lower. All items to the right of a given node in the tree are guaranteed to be higher. In the less-than operation, the key to making a ranged query work becomes
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CHAPTER 14 LINQ TO C SLA
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enumerating through the left subtree of the node that either matches or is the lowest value that is higher than the value being compared. In a greater-than operation, it is the exact reverse: enumerating through the right subtree of the node that either matches or is the highest value that is lower than the value being compared. The performance of lookup over balanced trees, such as red-black trees, is typically log(N) + 2, while retaining a good deal of memory efficiency and the ability to quickly find those items higher or lower than a given item. The performance characteristics of this lookup are good. Because CSLA .NET uses a red-black tree a tree that guarantees that the depth is no deeper than log(N) + 2 you know that finding one item out of one million will take, at most, 22 comparison operations. Depending on where the item is, that same item without an index can take up to a million comparison operations, since without an index, each object has to be compared.
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Indices on Other Properties: Dictionary
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When the property you re building an index on does not implement IComparable, you can t use those structures in any kind of tree implementation, since placement of an item in a tree depends on item comparison. Therefore, to implement an index on a non-IComparable property, you need to use a Dictionary to enable fast lookup for equality-based queries. The performance characteristics of the Dictionary are actually a little bit faster than a red-black tree most of the time, assuming that the GetHashCode() implementation generates a high probability that calls on different objects of your child type generate unique values. However, because there is a chance, however small, that two different objects can generate the same hash code, you may require more than the single compare operation that is typical with Dictionary. If you were to override GetHashCode() in a manner where you return the same number for all instances of your object, you would end up with zero benefit to using indexing at all.
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