IsMirrored property - what is this?

[dgk]

I'm searching for a way to determine if control values have changed.
For some it's easy, such as TextBox.Modifie d. But looking at the
radiobutton I come across IsMirrored. Curious, I look to the help. Not
very helpful. So I look to the newsgroup. Not mentioned. So now I ask.
What does the IsMirrored property tell me?

[Jay B. Harlow [MVP - Outlook]]

Dgk,

Ok, here's another idea. Someone MUST have done this already. I write
a public method in the object that accepts another object instance as
a parameter and then uses reflection to determine all of its
properties and compares the output of the Get from each one to
determine if the objects are identical. Did I just duplicate some
functionality that already exists? I hate when I do that. Implementing Equals or Compare via reflection is easy enough I don't know if
I would be concerned with duplicating other peoples work, as its a good
learning experience. Whether or not I used it would depend on performance &
behavior ramifications. For equals behavior shouldn't matter, however for
comparing behavior could be affected as you cannot control the sequence of
the comparisons (there is no guarantee on the order that the properties are
returned).

The method created however would/could be the basis for IEquatable(Of T) &
IComparable(Of T) in VS 2005 (Overrides System.Equals & IComparable in VS
2002 & 2003).

--
Hope this helps
Jay [MVP - Outlook]
..NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley - http://www.tsbradley.net
<dg*@somewhere. com> wrote in message
news:17******** *************** *********@4ax.c om... On Mon, 28 Nov 2005 20:48:39 -0600, "Jay B. Harlow [MVP - Outlook]"
<Ja************ @tsbradley.net> wrote:

dgk,
| All these values are coming out of an object and going back into that
| object,
Oh! in the case where you have an "object" I would ask the object if any
of
its values changed.

In my Property Set methods on my object I call a protected "SetDirty"
method
that sets a boolean flag that indicates if the object is dirty. My
"object"
then has a public readonly IsDirty property that the UI can use to decide
if
its dirty or not. When an object is loaded or saved, the boolean flag is
cleared to indicate that the object itself is not dirty. Generally
SetDirty,
IsDirty, and the boolean flag are part of a common base class.

| Essentially I'm trying to show a "Are you sure you want to discard
| your changes" type dialog if someone hits the cancel button after
...
| So I guess I have to
| implement my own code for this?
I would consider implementing a "Clone" method that returns a "copy" of
the
current object, this method would use MemberwiseClone if a shallow copy
was
acceptable, otherwise it would do a deep copy. Be careful on deep copies &
object hierarchies.

Alternative ly I would consider having 2 fields for each property of my
"object", a current value & an original value. The "object" would have a
"Revert" method that would restore the current values to the "original"
values. When I load the object I would set both fields to the same value.

But I'm planning on updating all the properties, whether they've
changed or not, which means that prior to calling SetDirty from each
property I should check to see if the Set is actually changing the
private value. Pain. I have a LOT of properties - hmm, this should
have been part of the Property snippet. Now I have to learn to edit
snippets.

Actually I already implemented something like this which I borrowed
from an example that I saw. It actually uses a DataRowState object to
track the changes which is neat because I can also store the fact that
it is new if that is the case.

Ok, here's another idea. Someone MUST have done this already. I write
a public method in the object that accepts another object instance as
a parameter and then uses reflection to determine all of its
properties and compares the output of the Get from each one to
determine if the objects are identical. Did I just duplicate some
functionality that already exists? I hate when I do that.