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The usefulness of the DLR becomes even more obvious when you need to make late bound calls on methods that take parameters. When you use longhand reflection calls, arguments need to be packaged up as an array of objects which are passed to the Invoke() method of MethodInfo. To illustrate using a fresh example, begin by creating a new C# Console Application named LateBindingWithDynamic. Next, add a Class Library project to the current solution (using the File | Add | New Project... menu option) named MathLibrary. Rename the initial Class1.cs of the MathLibrary project to SimpleMath.cs, and implement the class like so: public class SimpleMath { public int Add(int x, int y) { return x + y; } } Once you have compiled your MathLibrary.dll assembly, place a copy of this library in the \bin\Debug folder of the LateBindingWithDynamic project (if you click the Show All Files button for each project of the Solution Explorer, you can simply drag and drop the file between projects). At this point, your Solution Explorer should look something like see Figure 18-4.

Note Remember, the whole point of late binding is allowing an application to create an object for which it has no record of it the MANIFEST. This is why you manually copied MathLibrary.dll into the output folder of the Console project, rather than reference the assembly using Visual Studio.

Now, import the System.Reflection namespace into the Program.cs file of your Console Application project. Next, add the following method to the Program class, which invokes the Add() method using typical reflection API calls: private static void AddWithReflection() { Assembly asm = Assembly.Load("MathLibrary"); try { // Get metadata for the SimpleMath type. Type math = asm.GetType("MathLibrary.SimpleMath");

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Console.WriteLine("Drawing a 3D Circle"); } } You can also apply the new keyword to any member type inherited from a base class (field, constant, static member, or property). As a further example, assume that ThreeDCircle wishes to hide the inherited PetName property: class ThreeDCircle : Circle { // Hide the PetName property above me. public new string PetName { get; set; } // Hide any Draw() implementation above me. public new void Draw() { Console.WriteLine("Drawing a 3D Circle"); } } Finally, be aware that it is still possible to trigger the base class implementation of a shadowed member using an explicit cast, as described in the next section. For example, the following code shows: static void Main(string[] args) { ... // This calls the Draw() method of the ThreeDCircle. ThreeDCircle o = new ThreeDCircle(); o.Draw(); // This calls the Draw() method of the parent! ((Circle)o).Draw(); Console.ReadLine(); }

Now that you can build a family of related class types, you need to learn the rules of class casting operations. To do so, let s return to the Employees hierarchy created earlier in this chapter. Under the .NET platform, the ultimate base class in the system is System.Object. Therefore, everything is-a Object and can be treated as such. Given this fact, it is legal to store an instance of any type within an object variable: void CastingExamples() { // A Manager "is-a" System.Object, so we can

The {search_dataset}.sid of the searchable item to which the word belongs The {search_dataset}.type of the searchable item to which the word belongs The numeric score of the word, higher being more important

// store a Manager reference in an object variable just fine object frank = new Manager("Frank Zappa", 9, 3000, 40000, "111-11-1111", 5); } In the Employees example, Managers, SalesPerson, and PTSalesPerson types all extend Employee, so you can store any of these objects in a valid base class reference Therefore, the following statements are also legal: static void CastingExamples() { // A Manager "is-a" SystemObject, so we can // store a Manager reference in an object variable just fine object frank = new Manager("Frank Zappa", 9, 3000, 40000, "111-11-1111", 5); // A Manager "is-an" Employee too Employee moonUnit = new Manager("MoonUnit Zappa", 2, 3001, 20000, "101-11-1321", 1); // A PTSalesPerson "is-a" SalesPerson.

SalesPerson jill = new PTSalesPerson("Jill", 834, 3002, 100000, "111-12-1119", 90); } The first law of casting between class types is that when two classes are related by an is-a relationship, it is always safe to store a derived object within a base class reference Formally, this is called an implicit cast, as it just works given the laws of inheritance This leads to some powerful programming constructs For example, assume you have defined a new method within your current Program class: static void GivePromotion(Employee emp) { // Increase pay.. // Give new parking space in company garage.. ConsoleWriteLine("{0} was promoted!", empName); } Because this method takes a single parameter of type Employee, you can effectively pass any descendent from the Employee class into this method directly, given the is-a relationship: static void CastingExamples() { // A Manager "is-a" System.

The search_node table stores items (like nodes) that link to other nodes; it is used to improve search scores for nodes that are frequently linked to. Table A-82. search_node_links (search module)