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What Is NET Reflection
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Every NET assembly contains metadata in addition to the program code The metadata contains information about the assembly, such as a version number and the information regarding which assemblies are referenced The metadata also includes information about all types defined with the assembly along with the methods, properties, and fields Using NET reflection, you can read this information during runtime and invoke methods dynamically Take a look at one example to read and invoke a method dynamically by using NET reflection In this example, a component library contains the class Demo with the method Message called dynamically The class Demo is in the assembly ReflectionLib in the file ReflectionLibdll namespace SamplesReflection { public class Demo { public void Message(string s) { SystemConsoleWriteLine(s); } }
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With the class Test that is contained in a simple console application, the method Message is called dynamically First, the assembly is loaded with the Assembly class and the static method LoadFrom The filename of the assembly is read from the command-line arguments that are passed when starting the application With the assembly object that is returned from AssemblyLoadFrom, the metadata of the assembly can be read The method GetType returns a Type instance representing the type SamplesReflectionDemo In case you want to read all types of the assembly, the method GetTypes returns an array of Type objects Calling the method tGetMethod returns method information represented in the classMethodInfo With the MethodInfo object, you can read the name of the method and get information about the parameters With the Invoke method of the MethodInfo class, you can invoke the method dynamically Because an instance method requires an object when calling the method, an object is created with the Activator class ActivatorCreateInstance creates an object by passing theType object that is read from the assembly The Invoke method allows you to pass any number of parameters to the target method with an object array The method Message just has one parameter, so an object array with a single object is passed to the Invoke method As a result, the stringTest is written to the console in theMessage method using System; using SystemReflection;
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class Test { static void Main(string[] args) { if (argsLength != 1) { ConsoleWriteLine("filename needed"); return; }
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string filename = args[0];
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Assembly assembly = AssemblyLoadFrom(filename); Type t = assemblyGetType("SamplesReflectionDemo"); MethodInfo mi = tGetMethod("Message");
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object o = ActivatorCreateInstance(t); object[] parameters = new object[] {"Test"}; miInvoke(o, parameters); } }
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COM Interface Types
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COM makes it possible to define three interface types:
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Custom interfaces Dispatch interfaces Dual interfaces The reason for having three interface types can be found in the evolutionary development of COM The following sections examine these interface types and explain how they can be offered with serviced components
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Custom Interfaces
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[8] Using a custom interface, the methods that are exposed with the interface are defined in a vtable With this vtable, just the entry point to this table is needed The order of the methods is defined with the interface Figure 4-4 shows a custom interface Custom interfaces always derive from the interfaceIUnknown IUnknown, the base interface of all COM interfaces, defines three methods: AddRef, Release, and QueryInterface Following these methods are pointers to the methods defined in the interface ICourseManagement: GetCourse, SetCourse, and GetCustomerControl
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Figure 4-4 Table of a custom interface
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The characteristic of such an interface is that this is the fastest way to invoke a method, but its use is restricted to languages where the interface definition is known at compile time Scripting clients (for example, VBScript, JavaScript) cannot use these interfaces, whereas Visual Basic 6 clients can Listing 4-4 shows the interface ICourseManagement changed to a custom interface To declare a custom COM interface with NET, you can use the attribute [InterfaceType] and specify ComInterfaceTypeInterfaceIsIUnknown with the constructor of the attribute Using this
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks attribute, you also have to import the namespace SystemRuntimeInteropServices All COM interop attributes are defined within this namespace
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