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Handling Non-Identity Projections
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When the query does not return an identity projection, the CslaQueryProvider still needs to return the expected result. Also, non-identity projections still should be able to take advantage of the indexing features of CSLA .NET. In such cases, control of the query, outside of handling for the Where() method, is passed to the default implementation provided in LINQ to Objects.
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Passing Control to the Default Handler
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CreateQuery() and Execute() are called not only when a query is being established or filtered, but also when other LINQ extension methods are invoked, such as Count(), First(), and many others. To understand why the implementation of IQueryProvider works the way it does, you need to understand how LINQ to Objects injects itself into any IEnumerable. All the methods in LINQ to Objects are implemented as static extension methods on the IEnumerable interface, defined in the Enumerable and Queryable classes in the System.Linq namespace. In fact, this is the reason why only upon including the System.Linq namespace do the LINQ extension methods come into scope. Implementation of IQueryable on a custom class changes this relationship. It is, by default, an all-or-nothing relationship, which means that once you implement your own IQueryProvider, you re expected to handle the entire set of extension methods defined on Enumerable (or at least, pass back a NonSupportedException). However, in a case like CSLA .NET, a special problem is presented. Because you re overriding only part of LINQ, you have no desire to re-implement the other more than 100 members that constitute LINQ. To help with this, CSLA .NET matches the Expression passed to CreateQuery() or Execute()
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CHAPTER 14 LINQ TO C SLA
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against one of the static methods on the Enumerable class. The following snippet from the CreateQuery() implementation shows an example of this: MethodCallExpression mex = (MethodCallExpression) expression; Type listType = typeof(Enumerable); MethodInfo[] listMethods = listType.GetMethods(); foreach (MethodInfo method in listMethods) if (MethodsEquivalent(mex,method)) { Type[] genericArguments = mex.Method.GetGenericArguments(); MethodInfo genericMethodInfo = method.MakeGenericMethod(genericArguments); var testObject = genericMethodInfo.Invoke(null, paramList.ToArray()); IQueryable<TElement> objectQuery = ((IEnumerable<TElement>)testObject).AsQueryable<TElement>(); return objectQuery; } The code is fairly straightforward, with MethodsEquivalent() doing most of the work to determine whether a given MethodCallExpression (which all calls to CreateQuery() or Execute() pass) is logically equivalent to a given reflected method definition that comes from the Enumerable static class. Once the correct MethodInfo from Enumerable is found, it is converted into a generic method call, which is then invoked dynamically via reflection and returned to the caller. The process is similar regardless of whether CreateQuery() or Execute() is being called. This technique that CSLA .NET uses to match the Expression to the correct implementation using the MethodsEquivalent() function should continue to work even in the event that Microsoft adds more extension methods to IEnumerable<T> and implements them in the static Enumerable class. However, if Microsoft were to update the class name that holds the LINQ to Objects extension methods, a change to CSLA .NET would be required to support it.
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LinqBindingList
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The LinqBindingList<C> holds the details of the query generated by it (the expression and the IQueryProvider) and a reference to the parent list, so that changes, additions, and deletions in LinqBindingList<C> can be propagated to the parent list, and in turn, to other instances of LinqBindingList<C> that are derived from the same source. LinqBindingList<C> itself implements the IQueryable<T> interface, allowing for subqueries against it that generate further LinqBindingList<C> instances. These subsequent LinqBindingList<C> instances are not children of the source LinqBindingList<C>. rather, they all have the same relationship to the original BusinessListBase<T, C>.
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Indexed LINQ and CSLA .NET
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Having the ability to analyze the expression tree that is passed to the Where() method in CSLA .NET provides an opportunity to optimize the query. Any indexing implementation is going to require Building and maintaining an index Intercepting the normal query operation such that the query can utilize the index
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