使用泛型和动态属性。

示例代码：

public class Entity where T : class { private Dictionary properties;

public Entity()
{
    properties = new Dictionary();
}

public T this[string propertyName]
{
    get
    {
        if (properties.ContainsKey(propertyName))
        {
            return properties[propertyName] as T;
        }
        return null;
    }
    set
    {
        properties[propertyName] = value;
    }
}

}

// 使用示例 Entity entity = new Entity(); entity["Name"] = "张三"; entity["Age"] = 20; string name = entity["Name"]; int age = entity["Age"]; // 编译时会产生错误，需要在运行时进行类型转换