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Part IV
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using System; namespace Wintellect.HostSDK { public interface IAddIn { String DoSomething(Int32 x); } }
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Second, here is the code for an AddInTypes .dll assembly defining two public types that implement the HostSDK s interface . To build this assembly, the HostSDK .dll assembly must be referenced:
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using System; using Wintellect.HostSDK; public sealed class AddIn_A : IAddIn { public AddIn_A() { } public String DoSomething(Int32 x) { return "AddIn_A: " + x.ToString(); } } public sealed class AddIn_B : IAddIn { public AddIn_B() { } public String DoSomething(Int32 x) { return "AddIn_B: " + (x * 2).ToString(); } }
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Third, here is the code for a simple Host .exe assembly (a console application) . To build this assembly, the HostSDK .dll assembly must be referenced . To discover usable add-in types, this host code assumes that the types are defined in assemblies ending with a .dll file extension and that these assemblies are deployed into the same directory as the host s EXE file . Microsoft s Managed Extensibility Framework (MEF) is built on top of the various mechanisms that I show here, and it also offers add-in registration and discovery mechanisms . I urge you to check MEF out if you are building a dynamically extensible application, as it can simplify some of the material in this chapter .
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using using using using using System; System.IO; System.Reflection; System.Collections.Generic; Wintellect.HostSDK;
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public static class Program { public static void Main() { // Find the directory that contains the Host exe String AddInDir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
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23 Assembly Loading and Reflection
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// Assume AddIn assemblies are in same directory as host's EXE file String[] AddInAssemblies = Directory.GetFiles(AddInDir, "*.dll"); // Create a collection of usable add-in Types List<Type> AddInTypes = new List<Type>(); // Load add-in assemblies; discover which types are usable by the host foreach (String file in AddInAssemblies) { Assembly AddInAssembly = Assembly.LoadFrom(file); // Examine each publicly exported type foreach (Type t in AddInAssembly.GetExportedTypes()) { // If the type is a class that implements the IAddIn // interface, then the type is usable by the host if (t.IsClass && typeof(IAddIn).IsAssignableFrom(t)) { AddInTypes.Add(t); } } } // Initialization complete: the host has discovered the usable add-ins // Here's how the host can construct add-in objects and use them foreach (Type t in AddInTypes) { IAddIn ai = (IAddIn) Activator.CreateInstance(t); Console.WriteLine(ai.DoSomething(5)); } } }
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The simple host/add-in scenario just shown doesn t use AppDomains . However, in a real-life scenario, you will likely create each add-in in its own AppDomain with its own security and configuration settings . And of course, each AppDomain could be unloaded if you wanted to remove an add-in from memory . To communicate across the AppDomain boundary, you d either tell the add-in developers to derive their add-in types from MarshalByRefObject or, more likely, have the host application define its own internal type that is derived from MarshalByRefObject . As each AppDomain is created, the host would create an instance of its own MarshalByRefObject-derived type in the new AppDomain . The host s code (in the default AppDomain) would communicate with its own type (in the other AppDomains) to have it load add-in assemblies and create and use instances of the add-in types .
using Reflection to Discover a Type s Members
So far, this chapter has focused on the parts of reflection assembly loading, type discovery, and object construction necessary to build a dynamically extensible application . In order to have good performance and compile-time type safety, you want to avoid using reflection as much as possible . In the dynamically extensible application scenario, once an object is constructed, the host code typically casts the object to an interface type or a base class that is known at compile time; this allows the object s members to be accessed in a high-performance and compile-time type-safe way .
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