动态创建和加载assembly

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Reference: http://msdn.microsoft.com/zh-cn/library/7hcs6az6(VS.80).aspx

using System;

using System.IO;

using System.Reflection;

using System.Reflection.Emit;

class Test

{

public static void Main()

{

AppDomain currentDomain = AppDomain.CurrentDomain;

//Current Domain

Console.WriteLine("Current Domain");

//InstantiateMyType(currentDomain); // Failed!

currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolver);

InstantiateMyType(currentDomain); // OK!

Console.WriteLine();

//Second Domain

Console.WriteLine("Second Domain");

System.Security.Policy.Evidence securityInfo = new System.Security.Policy.Evidence(currentDomain.Evidence);

string appBasePath = currentDomain.BaseDirectory;

AppDomain secondDomain = AppDomain.CreateDomain("Test dynamic create and load assembly",securityInfo,appBasePath,null,false);

secondDomain.AssemblyResolve += new ResolveEventHandler(MyResolver);

InstantiateMyType(secondDomain);

AppDomain.Unload(secondDomain);

Console.Read();

}

static void InstantiateMyType(AppDomain domain)

{

try

{

// You must supply a valid fully qualified assembly name here.

object obj = domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType").Unwrap();

Console.WriteLine("Dynamic object created!");

}

catch (Exception e)

{

Console.WriteLine(e.Message);

}

// Loads the content of a file to a byte array.

static byte[] loadFile(string filename)

{

FileStream fs = new FileStream(filename, FileMode.Open);

byte[] buffer = new byte[(int) fs.Length];

fs.Read(buffer, 0, buffer.Length);

fs.Close();

return buffer;

}

public static Assembly MyResolver(object sender, ResolveEventArgs args)

{

AppDomain domain = (AppDomain) sender;

// Once the files are generated, this call is

// actually no longer necessary.

EmitAssembly(domain);

byte[] rawAssembly = loadFile("MyAssembly.dll");

byte[] rawSymbolStore = loadFile("MyAssembly.pdb");

Assembly assembly = domain.Load(rawAssembly, rawSymbolStore);

return assembly;

}

// Creates a dynamic assembly with symbol information

// and saves them to temp.dll and temp.pdb

static void EmitAssembly(AppDomain domain)

{

AssemblyName assemblyName = new AssemblyName();

assemblyName.Name = "MyAssembly";

AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save);

ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "MyAssembly.dll", true);

TypeBuilder typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public | TypeAttributes.Serializable);

ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);

ILGenerator ilGenerator = constructorBuilder.GetILGenerator();

ilGenerator.EmitWriteLine("MyType instantiated!");

ilGenerator.Emit(OpCodes.Ret);

System.Type myType = typeBuilder.CreateType();

assemblyBuilder.Save("MyAssembly.dll");

}