a doubt about simple property

Question

Hello to everybody...

I'm fighting hardly against the INotifyPropertyChanged and similars...

I managed to bind the height of a simple rectangle to the value incremented on the base of a timer. (the rectangle grows while the time is passing)..

Now what i should do is to bind 5 different rectangles to 5 different float values changing continuosly inside a List<float> or a float[] (i'm working with the list)..

I couldn't do that, but the main thing i noted is that if i set in my class:

---------------------------------------------
private List<float> _flowValuesSplitter;

public List<float> FlowValuesSplitter
        {
            get { return _flowValuesSplitter; }
            set
            {
                if (_flowValuesSplitter != value)
                {
                    _flowValuesSplitter = value;
                    OnPropertyChanged("Value");

                }
            }
        }

(I implemented the OnpropertyChanged... )

what i discovered is that when i Initialize the List<float> with -> FlowValuesSplitter= new List<float>{0,0,0,0,0}

the code enters in the setter of the Property, but when later i do:

for (int s = 0; s < FlowValuesSplitter.Count; s++)
            {
                FlowValuesSplitter[s] += (float)(6.7);
            }

the code doens't enter in the property setter...

Did i miss smt basic????

thanks, I.

Vulpes · Answer

It only enters the property setter when you assign a new or different List object to it. Changing a member of the List doesn't create a new List object and so the property setter isn't entered.

Ivan · Answer

and thanks again...

Ivan · Answer

thank you for the fast answer.... anyway my doubt remains... I mean if i have a property defined public List myList { get ... set... } and later i defined myList = new List {00000} it enters inside the property setter... when i do myList[0] = 5.4 it doens't enter... Now let's leaving out the propertyChanged ..... why it doens't enter in the the property setter when i change the values?

Muralidharan Deenathayalan · Answer

List FlowValuesSplitter= new List {00000} By using the above statment you're are creating a (collection variable) Collection of float variable to store in the float values. Here there is no relationship between your property as well the FlowValuesSplitter variable. What you can do it create an instance for your class then you can assign the your property value to the variable then your onpropertychanged method will work. try this. List FlowValuesSplitter = new List { 0 0 0 0 0 }; WindowsFormsApplication1.Class1 c = new Class1(); c.FlowValuesSplitter = FlowValuesSplitter; Inside the class1 I have the property(FlowValuesSplitter)  in the form i have created the list of float varibles. Once you assigned the value the propertychange event will work hope this helps you.

Ivan · Answer

I left that out but still when i put the breakpoint it doesn't stop...

Muralidharan Deenathayalan · Answer

For testing can you remove the below condition and try once. if(_flowValuesSplitter !=value) { }