c＃使用reflection从派生类中获取私有成员变量 [英] c# use reflection to get a private member variable from a derived class

问题描述

我有以下结构：

abstract class Parent {}


class Child : Parent
{   
    // Member Variable that I want access to:
    OleDbCommand[] _commandCollection;

    // Auto-generated code here
}

是可以使用Parent类中的反射来访问Child类中的_commandCollection吗？如果没有关于如何实现这一点的任何建议？

Is it possible to use reflection from within the Parent class to access the _commandCollection within the Child class? If not any suggestions on how I can achieve this?

编辑：
它可能值得一提的是在抽象的父类我计划使用IDbCommand []来处理_commandCollection对象，因为我的所有TableAdapter都不会使用OleDb连接到各自的数据库。

Its probably worth mentioning that in the abstract Parent class I plan to use IDbCommand[] to handle the _commandCollection object as not all my TableAdapters will be using OleDb to connect to their respective databases.

EDIT2：
对于所有评论说...只是向子类添加一个函数属性，我不能像VS Designer自动生成它。每次我在设计师中改变某些东西时，我真的不想重新做我的工作！

For all the comments saying ... just add a property of function to the child class, I can't as its automatically generated by the VS Designer. I really don't want to have to re-do my work every time I change something in the designer!

推荐答案

// _commandCollection is an instance, private member
BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;

// Retrieve a FieldInfo instance corresponding to the field
FieldInfo field = GetType().GetField("_commandCollection", flags);

// Retrieve the value of the field, and cast as necessary
IDbCommand[] cc =(IDbCommand[])field.GetValue(this);

数组协方差应该确保演员表演成功。

Array covariance should ensure that the cast is successful.

我假设一些设计师会生成子类？否则，您可能正在寻找受保护的财产。

I assume some designer will be generating the subclasses? Otherwise, a protected property is probably what you're looking for.

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