c# use reflection to get a private member variable from a derived class
I have the following structure:
abstract class Parent {}
class Child : Parent
{
// Member Variable that I want access to:
OleDbCommand[] _command开发者_如何转开发Collection;
// Auto-generated code here
}
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?
EDIT: 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: 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!
// _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);
Array covariance should ensure that the cast is successful.
I assume some designer will be generating the subclasses? Otherwise, a protected property is probably what you're looking for.
It's possible, though it's a decidedly bad idea.
var field = GetType().GetField("_commandCollection", BindingFlags.Instance | BindingFlags.NonPublic);
I think what you really want to do is provide a method for the child classes to provide the parent with the required data:
protected abstract IEnumerable<IDBCommand> GetCommands();
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