Undo/Redo in collection of collection

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i need to implement undo function in my winform project.
i have implemented a stack which store property value and property name as object.
when i need to undo i just pop from stack and reassign the value. now the problem is its working fine with string property, but not with collection. i.e. i have a class i.e. class x, which contain some property i.e. String ID etc and some other collection i.e. List<y> , List<z> and these collection classes also have some collection i.e. Class Y have "List<a>" etc

C#

class X : inotify
{
   string id;
   YCollection YCol;
   ZCollection ZCol;
}

YCollection : List<y>
{
   Add(Y)
{
---
}
Remove(Y)
{
}

}

Class Y: inotify
{
   string ID;
   ACollection ACol;
}

Class ACollection : List<a>
{
   Add(A)
   Remove(A)
}

class A : inotify
{
   string ID;
}

now i dont know how to tackle this problem, because when change occure in lower level i.e. Class A object, i dont know how to find where change occure, and when to push this into stack for undo.
can someone help.

Posted 11-Jun-12 18:30pm

jp1981

Updated 11-Jun-12 18:46pm

Shahin Khorshidnia

v2

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Shahin Khorshidnia · Accepted Answer · 2012-06-11T18:54:00

Solution 1

Hello

Use ObservableCollection instead of List

For example:

C#

private ObservableCollection<MyClass> _myProperty;
public ObservableCollection<MyClass> MyProperty
{
   get { return _myProperty; }
   set
   {
                _myProperty = value;
                _myProperty.CollectionChanged += new NotifyCollectionChangedEventHandler((object sender, NotifyCollectionChangedEventArgs e) => {
   //Some Code
   }
}

http://msdn.microsoft.com/en-us/library/ms668604.aspx[^]
http://msdn.microsoft.com/en-us/library/ms653375.aspx[^]

Posted 11-Jun-12 18:54pm

Shahin Khorshidnia

Updated 11-Jun-12 20:17pm

v3

Comments

Sergey Alexandrovich Kryukov 12-Jun-12 1:42am

I would note that your question is not quite correct then. If you cannot make a decision, thing about it: by asking such question you simply waste expert's time. If your "senior" tells you what to do, let him ask the question; or this person should make sure you can do the job. Why should we get involved in the problem of your relationships with your colleagues? Please keep such excuses to yourself and regulate your communications in your team by yourself. If you ask a question, be ready to use it. Or present your "constraints" in first place, but don't expect them to be welcome. If you asking how to achieve some behavior, don't tell use "don't use this and that"...
--SA

Shahin Khorshidnia 12-Jun-12 2:15am

%100 Agreed.

jp1981 12-Jun-12 2:27am

sorry, but it was not an excuse. it was my mistake that i didn't put this while asking question. i will make sure that i will not do this again in future. i am already working on the solution suggested by shahin.

Shahin Khorshidnia 12-Jun-12 2:21am

Jitendra, I don't think List can notify while it's updating. You should use another kind of collection and ObservableCollection is recommended.

jp1981 12-Jun-12 2:24am

Thanks a lot Shahin. i am working on solution suggested by you.

Sergey Alexandrovich Kryukov 12-Jun-12 1:35am

Makes sense, my 5.
--SA

Shahin Khorshidnia 12-Jun-12 2:13am

Thank you very much SA :)

Sandeep Mewara 12-Jun-12 2:08am

My 5!

Shahin Khorshidnia 12-Jun-12 2:13am

Thanks a lot Sandeep :)