Emit语法简单实现(含实例)
来源：互联网 发布：江西淘宝大学 编辑：程序博客网 时间：2024/05/21 08:38
了解完Emit的基本概念后就应该实际动手操作一下了，就像C#代码一样Emit代码也不是都需要理解的，复杂的逻辑当然需要理解，但是像string str=”abc”;这样的就不用深究了吧，知道这是干嘛的就行了。
没有了解过Emit和IL的朋友请先看看下面两篇文章：
Emit基本概念介绍：http://blog.csdn.net/xiaouncle/article/details/52621815
轻松读懂IL：http://blog.csdn.net/xiaouncle/article/details/52770462
【无返回值】无参方法SayHello()
Emit代码：
static void Main(string[] args){ AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*【不同点1】 MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public, null, null); ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); ilOfSayHello.Emit(OpCodes.Ldstr, "蝈蝈"); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); //没有返回值所有加OpCodes.Pop ilOfSayHello.Emit(OpCodes.Pop); ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); //【不同点2】 methodInfo.Invoke(obj, null); }.Net Reflector转换后代码：
public class Person{ // Methods public void SayHello() { Console.WriteLine("蝈蝈"); Console.ReadLine(); }}【无返回值】静态无参方法SayHello()
Emit代码：
static void Main(string[] args){ AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*【不同点1】 MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public | MethodAttributes.Static, null, null); ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); ilOfSayHello.Emit(OpCodes.Ldstr, "蝈蝈"); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); //没有返回值所有加OpCodes.Pop ilOfSayHello.Emit(OpCodes.Pop); ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); //【不同点2】 methodInfo.Invoke(obj, null); }.Net Reflector转换后代码：
public class Person{ // Methods public static void SayHello() { Console.WriteLine("蝈蝈"); Console.ReadLine(); }}【无返回值】含参方法SayHello(string name)
Emit代码：
static void Main(string[] args){ AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*【不同点1】 MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public, null, new Type[] { typeof(string) }); ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); ilOfSayHello.Emit(OpCodes.Ldstr, "你好：{0}"); //【不同点2】 ilOfSayHello.Emit(OpCodes.Ldarg_1); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string), typeof(string) })); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); //没有返回值所有加OpCodes.Pop ilOfSayHello.Emit(OpCodes.Pop); ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); //【不同点3】 methodInfo.Invoke(obj, new object[] { "蝈蝈" }); }.Net Reflector转换后代码：
public class Person{ // Methods public void SayHello(string text1) { Console.WriteLine("你好：{0}", text1); Console.ReadLine(); }}【无返回值】静态含参方法SayHello(string name)
Emit代码：
static void Main(string[] args){ AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*【不同点1】 MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public | MethodAttributes.Static, null, new Type[] { typeof(string) }); ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); ilOfSayHello.Emit(OpCodes.Ldstr, "你好：{0}"); //【不同点2】 ilOfSayHello.Emit(OpCodes.Ldarg_0); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string), typeof(string) })); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); //没有返回值所有加OpCodes.Pop ilOfSayHello.Emit(OpCodes.Pop); ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); //【不同点3】 methodInfo.Invoke(obj, new object[] { "蝈蝈" }); }.Net Reflector转换后代码：
public class Person{ // Methods public static void SayHello(string text1) { Console.WriteLine("你好：{0}", text1); Console.ReadLine(); }}【有返回值】无参方法SayHello()
Emit代码：
static void Main(string[] args){ AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*【不同点1】 MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public, typeof(string), null); ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); ilOfSayHello.Emit(OpCodes.Ldstr, "蝈蝈"); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); //为什么加OpCodes.Pop ilOfSayHello.Emit(OpCodes.Pop); //返回值部分 LocalBuilder local = ilOfSayHello.DeclareLocal(typeof(string)); ilOfSayHello.Emit(OpCodes.Ldstr, "返回值"); ilOfSayHello.Emit(OpCodes.Stloc_0, local); ilOfSayHello.Emit(OpCodes.Ldloc_0, local); ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); //【不同点2】 object result = methodInfo.Invoke(obj, null); Console.WriteLine("result=" + result.ToString()); Console.ReadKey();}.Net Reflector转换后代码：
public class Person{ // Methods public string SayHello() { Console.WriteLine("蝈蝈"); Console.ReadLine(); return "返回值"; }}【有返回值】静态无参方法SayHello()
Emit代码：
static void Main(string[] args){ AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*【不同点1】 MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public | MethodAttributes.Static, typeof(string), null); ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); ilOfSayHello.Emit(OpCodes.Ldstr, "蝈蝈"); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); //为什么加OpCodes.Pop ilOfSayHello.Emit(OpCodes.Pop); //返回值部分 LocalBuilder local = ilOfSayHello.DeclareLocal(typeof(string)); ilOfSayHello.Emit(OpCodes.Ldstr, "返回值"); ilOfSayHello.Emit(OpCodes.Stloc_0, local); ilOfSayHello.Emit(OpCodes.Ldloc_0, local); ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); //【不同点2】 object result = methodInfo.Invoke(obj, null); Console.WriteLine("result=" + result.ToString()); Console.ReadKey();}.Net Reflector转换后代码：
public class Person{ // Methods public static string SayHello() { Console.WriteLine("蝈蝈"); Console.ReadLine(); return "返回值"; }}【有返回值】含参方法SayHello(string name)
Emit代码：
static void Main(string[] args){ AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*【不同点1】 MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public, typeof(string), new Type[] { typeof(string) }); ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); ilOfSayHello.Emit(OpCodes.Ldstr, "蝈蝈"); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); //为什么加OpCodes.Pop ilOfSayHello.Emit(OpCodes.Pop); //返回值部分 LocalBuilder local = ilOfSayHello.DeclareLocal(typeof(string)); ilOfSayHello.Emit(OpCodes.Ldstr, "99999{0}"); //【不同点2】 ilOfSayHello.Emit(OpCodes.Ldarg_1); ilOfSayHello.Emit(OpCodes.Call, typeof(string).GetMethod("Format", new Type[] { typeof(string), typeof(string) })); ilOfSayHello.Emit(OpCodes.Stloc_0, local); ilOfSayHello.Emit(OpCodes.Ldloc_0, local); ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); //【不同点3】 object result = methodInfo.Invoke(obj, new object[] { "蝈蝈" }); Console.WriteLine("result=" + result.ToString()); Console.ReadKey();}.Net Reflector转换后代码：
public class Person{ // Methods public string SayHello(string text1) { Console.WriteLine("蝈蝈"); Console.ReadLine(); return string.Format("99999{0}", text1); }}【有返回值】静态含参方法SayHello(string name)
Emit代码：
static void Main(string[] args){ AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*【不同点1】 MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public | MethodAttributes.Static, typeof(string), new Type[] { typeof(string) }); ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); ilOfSayHello.Emit(OpCodes.Ldstr, "蝈蝈"); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); //为什么加OpCodes.Pop ilOfSayHello.Emit(OpCodes.Pop); //返回值部分 LocalBuilder local = ilOfSayHello.DeclareLocal(typeof(string)); ilOfSayHello.Emit(OpCodes.Ldstr, "99999{0}"); //【不同点2】 ilOfSayHello.Emit(OpCodes.Ldarg_0); ilOfSayHello.Emit(OpCodes.Call, typeof(string).GetMethod("Format", new Type[] { typeof(string), typeof(string) })); ilOfSayHello.Emit(OpCodes.Stloc_0, local); ilOfSayHello.Emit(OpCodes.Ldloc_0, local); ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); //【不同点3】 object result = methodInfo.Invoke(obj, new object[] { "蝈蝈" }); Console.WriteLine("result=" + result.ToString()); Console.ReadKey();}.Net Reflector转换后代码：
public class Person{ // Methods public static string SayHello(string text1) { Console.WriteLine("蝈蝈"); Console.ReadLine(); return string.Format("99999{0}", text1); }}实例代码免费下载地址：http://download.csdn.net/detail/xiaouncle/9649675
.Net Reflector Version 9.0.1.374 带注册机免费下载地址： http://download.csdn.net/detail/xiaouncle/9649783
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