C#类在运行时动态扩展属性

需求

在使用构建业务类型时，对应的Model属性需要动态变更（新增）。

讨论及方案1

讨论1：

You cannot extend an existing class with new members at runtime. However, you can create a new class using System.Reflection.Emit that has the existing class as base class.
See TypeBuilder.DefineProperty Method (String, PropertyAttributes, Type, Type[]) for a full example.

typeBuilder.SetParent(typeof(MyClass));
typeBuilder.DefineProperty("Prop1", ..., typeof(System.Int32), null