topic Re: Please help me , I have a big problem in ArcGIS API for Silverlight Questions

Please help me , I have a big problem

mohammadabdullah — Sat, 31 Mar 2012 20:12:34 GMT

Hello every body !!! .
     Now , i develop silverlight application , which this application contains two Usercontrols
   the first one
   add some information about certain shop and locate its location in the map to store its location extents and its MapPoints from the map to Database
the second one
to retreive shop information and its location extents and mappoint from DB to locate these extents and MapPoint in the Map

but i have a big problem ???!!!! 😞

I'am working with MVVM in Silverlight
Now i have a problem in the binding to Extents XMAx , YMax , Xmin , Ymin to get stored extents from DB to set these extents to Map extents

<esriGeometry:Envelope XMin="{Binding ExtentXMin}" YMin="{Binding ExtentYMin}" XMax="{Binding ExtentXMax}" YMax="{Binding ExtentYMax}" />

its not working this operation

please help me to solve this problem
thank you

Re: Please help me , I have a big problem

JenniferNery — Sat, 11 Dec 2021 07:17:35 GMT

Unfortunately, Envelope is not a DependencyObject or it does not implement INotifyPropertyChanged, which makes these properties not support binding. You can however wrap it around another class that implements INotifyPropertyChanged.

Maybe something like this:

    public class MyEnvelope : INotifyPropertyChanged
    {
        private Envelope envelope;
        private Envelope Envelope
        {
            get
            {
                if (envelope == null)
                    envelope = new Envelope();
                return envelope;
            }
        }

        public double XMin
        {
            get { return Envelope.XMin; }
            set
            {
                if (Envelope.XMin != value)
                {
                    Envelope.XMin = value;
                    OnPropertyChanged("XMin");
                }
            }
        }

//more code

        public event PropertyChangedEventHandler PropertyChanged;
        private void OnPropertyChanged(string property)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
    }

Re: Please help me , I have a big problem

mohammadabdullah — Sun, 01 Apr 2012 03:37:54 GMT

thank you very much

but i have a question ,, this is about C# Side ,,, what about Xaml side ????
what will i do in xaml to bind between this code and xaml

Re: Please help me , I have a big problem

RichardWatson — Sun, 01 Apr 2012 12:50:42 GMT

http://sharpgis.net/post/2009/05/03/Using-surrogate-binders-in-Silverlight.aspx

Re: Please help me , I have a big problem

JenniferNery — Mon, 02 Apr 2012 23:59:46 GMT

In XAML, you can then use your Envelope class that wrapped the API Envelope class instead.

<local:MyEnvelope XMin="{Binding xmin}" .../>