在int上发出调用GetHashCode的ILGenerator

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

public class Program
{
    public static void Main()
    {
        // 创建动态程序集和模块
        AssemblyName assemblyName = new AssemblyName("DynamicAssembly");
        AssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
        ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("DynamicModule");

        // 创建类型
        TypeBuilder typeBuilder = moduleBuilder.DefineType("DynamicType", TypeAttributes.Public);

        // 创建方法
        MethodBuilder methodBuilder = typeBuilder.DefineMethod("DynamicMethod", MethodAttributes.Public | MethodAttributes.Static, typeof(int), new Type[] { typeof(int) });

        // 创建ILGenerator对象
        ILGenerator ilGenerator = methodBuilder.GetILGenerator();

        // 发出调用GetHashCode的IL代码
        ilGenerator.Emit(OpCodes.Ldarg_0); // 将参数加载到堆栈
        ilGenerator.Emit(OpCodes.Call, typeof(int).GetMethod("GetHashCode")); // 调用GetHashCode方法
        ilGenerator.Emit(OpCodes.Ret); // 返回结果

        // 创建类型并调用方法
        Type dynamicType = typeBuilder.CreateType();
        MethodInfo dynamicMethod = dynamicType.GetMethod("DynamicMethod");
        int result = (int)dynamicMethod.Invoke(null, new object[] { 123 });

        Console.WriteLine(result); // 输出哈希码
    }
}