Comparing Classes

[Jay1b]

I have created a class which stores information which will be displayed within a listview. A timer calls a procedure that refreshes the listview from this class, unfortunately this creates a flickering effect.

 

'IntegerA POSSIBLY changed

IF IntegerA <> IntegerB THEN
   'refresh listview
   IntegerB = IntegerA
END IF

 

The above example would only refresh if IntegerA HAD changed. Could someone please explain how can i do something similar to this with classes please?

 

Thanks

[Mister E]

Why not just create an integer property that you can use for comparison purposes? If you want to naturalize things a bit then you could overload the equality operators.

[Jay1b]

Thanks but I thought about that, but it just seems very amateur'ish. There must be a way of comparing two instances of the same class.

[michael_hk]

Take a look at the IComparable interface.

[snarfblam]

I think IComparable is more meant for sorting or finding when an object is greated or less than another (Although if IComparable.CompareTo() returns a zero, it does signify equality, it is generally used for sorting of collections). Since you only want to test for equality, I recommend overriding the .Equals() method. Since you are using VB, you can't overload the = operator.

[Jay1b]

In the end i remembered there was a sequence number variable in the class, i just use this to compare to an integer. Much easier :D

 

Didnt want to create an integer special though.

[Mister E]

Well, you wouldn't need to create a new variable. That's the point of a read only property.

[IngisKahn]

Mr. eater is sorta right :), you want to override AND overload Equals(), you don't want to expose a new property.