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As explained, the DLR will pass the expression trees to a target object, however this dispatching will be influenced by a few factors. If the dynamic data type is pointing in memory to a COM object, the expression tree is sent to a low-level COM interface named IDispatch. As you may know, this interface was COM s way of incorporating its own set of dynamic services. COM objects, however, can be used in a .NET application without the use of the DLR or C# dynamic keyword. Doing so however (as you will see) tends to result in much more complex C# coding. If the dynamic data is not pointing to a COM object, the expression tree may be passed to an object implementing the IDynamicObject interface. This interface is used behind the scenes to allow a language such as IronRuby to take a DLR expression tree and map it to Ruby-specifics. Finally, if the dynamic data is pointing to an object which is not a COM object and does not implement IDynamicObject, the object is a normal, everyday .NET object. In this case, the expression tree is dispatched to the C# runtime binder for processing. The process of mapping the expression tree to .NET specifics involves reflection services.

Once the expression tree has been processed by a given binder, the dynamic data will be resolved to the real in-memory data type, after which the correct method is called with any necessary parameters. Now, let s see a few practical uses of the DLR, beginning with the simplification of late bound .NET calls.

Search item ID, for example, the node ID for nodes Type of item, for example, node List of space-separated words from the item

One place where you might decide to use the dynamic keyword is when you are working with reflection services, specifically when making late bound method calls. Back in 15, you saw a few examples of when this type of method call can be very useful, most commonly when you are building some type of extensible application. At that time, you learned how to use the Activator.CreateInstance() method to create an object, for which you have no compile time knowledge of (beyond its display name). You can then make use of the types of the System.Reflection namespace to invoke members via late binding. Recall the following example from 15. static void CreateUsingLateBinding(Assembly asm) { try { // Get metadata for the Minivan type. Type miniVan = asm.GetType("CarLibrary.MiniVan"); // Create the Minivan on the fly. object obj = Activator.CreateInstance(miniVan); // Get info for TurboBoost. MethodInfo mi = miniVan.GetMethod("TurboBoost"); // Invoke method ('null' for no parameters). mi.Invoke(obj, null); } catch (Exception ex) { Console.WriteLine(ex.Message); } } While this is code works as expected, you might agree it is a bit clunky. Here, you have to manually make use of the MethodInfo class, manually query the metadata, and so forth. The following is a version of this same method, now using the C# dynamic keyword and the DLR: static void InvokeMethodWithDynamicKeyword(Assembly asm) { try { // Get metadata for the Minivan type. Type miniVan = asm.GetType("CarLibrary.MiniVan");

// Create the Minivan on the fly and call method! dynamic obj = Activator.CreateInstance(miniVan); obj.TurboBoost(); } catch (Exception ex) { Console.WriteLine(ex.Message); } } By declaring the obj variable using the dynamic keyword, the heavy lifting of reflection is done on your behalf courtesy of the DRL!

The search_index table stores the search index and associates words, items, and scores. Table A-81. search_index (search module)