.NET 3.5在运行时更改对象类型

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

public class Program
{
    public static void Main()
    {
        // 创建一个原始对象
        var originalObject = new OriginalObject { Name = "John", Age = 25 };

        // 获取原始对象的类型
        var originalType = originalObject.GetType();

        // 创建一个新类型
        var newType = CreateNewType(originalType);

        // 创建新类型的实例
        var newObject = Activator.CreateInstance(newType);

        // 将原始对象的数据复制到新对象
        CopyData(originalObject, newObject);

        // 输出新对象的属性值
        Console.WriteLine("Name: " + newType.GetProperty("Name").GetValue(newObject));
        Console.WriteLine("Age: " + newType.GetProperty("Age").GetValue(newObject));
    }

    private static Type CreateNewType(Type originalType)
    {
        // 创建一个动态程序集
        var assemblyName = new AssemblyName("DynamicAssembly");
        var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
        var moduleBuilder = assemblyBuilder.DefineDynamicModule("DynamicModule");

        // 创建一个新类型
        var typeBuilder = moduleBuilder.DefineType("NewObject", TypeAttributes.Public);

        // 复制原始类型的属性到新类型
        foreach (var property in originalType.GetProperties())
        {
            var propertyBuilder = typeBuilder.DefineProperty(property.Name, PropertyAttributes.HasDefault, property.PropertyType, null);
            var getMethodBuilder = typeBuilder.DefineMethod("get_" + property.Name, MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig, property.PropertyType, Type.EmptyTypes);
            var getILGenerator = getMethodBuilder.GetILGenerator();
            getILGenerator.Emit(OpCodes.Ldarg_0);
            getILGenerator.Emit(OpCodes.Call, property.GetGetMethod());
            getILGenerator.Emit(OpCodes.Ret);
            propertyBuilder.SetGetMethod(getMethodBuilder);
        }

        // 创建新类型
        return typeBuilder.CreateType();
    }

    private static void CopyData(object source, object destination)
    {
        var sourceType = source.GetType();
        var destinationType = destination.GetType();

        foreach (var property in sourceType.GetProperties())
        {
            var value = property.GetValue(source);
            destinationType.GetProperty(property.Name).SetValue(destination, value);
        }
    }
}

public class OriginalObject
{
    public string Name { get; set; }
    public int Age { get; set; }
}