MSIL实用指南-创建枚举类型

创建枚举类型比较简单，主要使用moduleBuilder.DefineEnum 和enumBuilder.DefineLiteral。

第一步：创建 EnumBuilder
创建 EnumBuilder用moduleBuilder.DefineEnum方法，参数是(<枚举类型名称>,<访问控制符>,<类型>)
具体例子是这样

EnumBuilder enumBuilder = moduleBuilder.DefineEnum(namespaceName + "." + typeName, TypeAttributes.Public, typeof(int));

用TypeAttributes.Private或者typeof(long)都是可以的。

第一步：创建枚举项
创建枚举项用enumBuilder.DefineLiteral(<枚举项名称>, <枚举值>);
例如

FieldBuilder builderRed = enumBuilder.DefineLiteral("Red", );

完整程序如下

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

namespace LX1_ILDemo
{
    class Demo06_Enum
    {
        static string binaryName = "Demo06_Enum.dll";
        static string namespaceName = "LX1_ILDemo";
        static string typeName = "EnumCreate";

        static AssemblyBuilder assemblyBuilder;
        static ModuleBuilder moduleBuilder;
        static EnumBuilder enumBuilder;

        static void Create_Enum()
        {
            enumBuilder = moduleBuilder.DefineEnum(namespaceName + "." + typeName, TypeAttributes.Public, typeof(int));

            FieldBuilder builderRed = enumBuilder.DefineLiteral("Red", );
            FieldBuilder builderYellow = enumBuilder.DefineLiteral("Yellow", );
            FieldBuilder builderBlue = enumBuilder.DefineLiteral("Blue", );
        }

        public static void Generate()
        {
            InitAssembly();
            Create_Enum();
            SaveAssembly();
            Console.WriteLine("生成成功");
        }

        static void InitAssembly()
        {
            AssemblyName assemblyName = new AssemblyName(namespaceName);
            assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave);
            moduleBuilder = assemblyBuilder.DefineDynamicModule(assemblyName.Name, binaryName);
        }

        static void SaveAssembly()
        {
            Type t = enumBuilder.CreateType();
            assemblyBuilder.Save(binaryName);
        }
    }
}