Reflection.Emit：AssemblyBuilder.SetEntryPoint不設置入口點

Question

我正在C＃中編寫一個連接語言，目前它被解釋，但我想要採取下一步：編譯。首先，我嘗試寫一個簡單的「你好，世界！」程序發射器使用System.Reflection.Emit。該代碼工作沒有任何的Emit異常，但是當我運行生成的「TEST.EXE」的文件，它拋出我曾試着用搜索引擎尋找答案異常

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

，但無濟於事。也許這裏有人可以幫助我？ （請）我寫的代碼如下：

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，問題是：我怎麼可以在進入點設置爲Main方法我定義？

Answer 1

您正在調用typeBuilder.CreateType（）， DefineDynamicModule必須將exe名稱作爲第二個參數傳遞。 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"); 
     } 
    } 
}