Reflection.Emit：AssemblyBuilder.SetEntryPoint不设置入口点

Question

我正在C＃中编写一个连接语言，目前它被解释，但我想要采取下一步：编译。首先，我尝试写一个简单的“你好，世界！”程序发射器使用System.Reflection.Emit。该代码工作没有任何的Emit异常，但是当我运行生成的“TEST.EXE”的文件，它抛出我曾试着用搜索引擎寻找答案异常

Unhandled Exception: System.MissingMethodException: Entry point not found in assembly 'IL_Test, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'. 

，但无济于事。也许这里有人可以帮助我？ （请）我写的代码如下：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Reflection; 
using System.Reflection.Emit; 
using System.IO; 
using System.Diagnostics; 

namespace ILCompileTest 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      const string ASSEMBLY_NAME = "IL_Test"; 

      AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(
       new AssemblyName(ASSEMBLY_NAME), AssemblyBuilderAccess.Save); 
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(
       ASSEMBLY_NAME); 
      TypeBuilder typeBuilder = moduleBuilder.DefineType("Program", 
       TypeAttributes.Class | TypeAttributes.Public); 
      MethodBuilder methodBuilder = typeBuilder.DefineMethod(
       "Main", MethodAttributes.Public | MethodAttributes.Static, 
       typeof(void), new Type[] { typeof(string[]) }); 
      ILGenerator gen = methodBuilder.GetILGenerator(); 

      gen.Emit(OpCodes.Ldstr, "Hello, World!"); 
      gen.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); 
      gen.Emit(OpCodes.Ldc_I4_1); 
      gen.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadKey", new Type[] { typeof(bool) })); 

      assemblyBuilder.SetEntryPoint(methodBuilder, PEFileKinds.ConsoleApplication); 
      File.Delete("test.exe"); 
      assemblyBuilder.Save("test.exe"); 

      Process.Start("test.exe"); 
     } 
    } 
} 

所以，问题是：我怎么可以在进入点设置为Main方法我定义？

Answer 1

您正在调用typeBuilder.CreateType（）， DefineDynamicModule必须将exe名称作为第二个参数传递。 Full working sample：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Reflection; 
using System.Reflection.Emit; 
using System.IO; 
using System.Diagnostics; 

namespace ILCompileTest 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      const string ASSEMBLY_NAME = "IL_Test"; 

      AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(
       new AssemblyName(ASSEMBLY_NAME), AssemblyBuilderAccess.Save); 
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(
       ASSEMBLY_NAME, "test.exe"); 
      TypeBuilder typeBuilder = moduleBuilder.DefineType("Program", 
       TypeAttributes.Class | TypeAttributes.Public); 
      MethodBuilder methodBuilder = typeBuilder.DefineMethod(
       "Main", MethodAttributes.HideBySig|MethodAttributes.Public | MethodAttributes.Static, 
       typeof(void), new Type[] { typeof(string[]) }); 
      ILGenerator gen = methodBuilder.GetILGenerator(); 

      gen.Emit(OpCodes.Ldstr, "Hello, World!"); 
      gen.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); 
      gen.Emit(OpCodes.Ldc_I4_1); 
      gen.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadKey", new Type[] { typeof(bool) })); 
      typeBuilder.CreateType(); 
      assemblyBuilder.SetEntryPoint(methodBuilder, PEFileKinds.ConsoleApplication); 
      File.Delete("test.exe"); 
      assemblyBuilder.Save("test.exe"); 

      Process.Start("test.exe"); 
     } 
    } 
}