sample3.cs

C#函数手册

using System;
using System.IO;
using System.Reflection;
using System.Reflection.Emit;

class Test 
{
	public static void  Main() 
	{
		AppDomain currentDomain = AppDomain.CurrentDomain;
		InstantiateMyType(currentDomain);  
		// 该过程出错
		currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolver);      
		InstantiateMyType(currentDomain);  
		//该过程运行正确
	}   
	static void InstantiateMyType(AppDomain domain) 
	{
		try 
		{
			domain.CreateInstance("MyAssembly", "MyType");
		} 
		catch (Exception e) 	
		{
			Console.WriteLine(e.Message);
		}
	}   
	//将当前文件装载到一个数组中 
	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;
	}
	static Assembly MyResolver(object sender, ResolveEventArgs args) 
	{
		AppDomain domain = (AppDomain) sender;
		//如果文件被赋值，就调用它
		EmitAssembly(domain);
		byte[] rawAssembly = loadFile("temp.dll");
		byte[] rawSymbolStore = loadFile("temp.pdb");
		Assembly assembly = domain.Load(rawAssembly, rawSymbolStore);
		return assembly;
	}
	// 创建一个动态存放标识符信息的集合
	// 保存在 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", "temp.dll", true);
		TypeBuilder typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public);
		ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
		ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
		ilGenerator.EmitWriteLine("MyType instantiated!");
		ilGenerator.Emit(OpCodes.Ret);
		typeBuilder.CreateType();
		assemblyBuilder.Save("temp.dll");
	}
}