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POSilverlight Start up life cycle and binding
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copied!<p>This is the first time I have used Silverlight and as such, I am new to the whole xaml markup style. I am building a GIS application using a silverlight library provided by ESRI.</p> <p>From my understanding, when the XAML page is parsed from top to bottom, the objects are created in the order. Is this correct? I have an esri Map object created on line 38 of my mainpage and then on line 247 of my mainpage, I create a DrawControl (a drawing control I made myself).</p> <p>Part of how the objects in drawing tool works is that it is created by passing the map object to the constructor. With my Map object with name x:Name="Map", I have the following for my drawcontrol:</p> <pre><code><local:DrawRootControl x:Name="DrawRoot" Height="152" Margin="216,10,0,0" Grid.Row="1" VerticalAlignment="Top" Visibility="Collapsed" map="{Binding ElementName=Map}"/> </code></pre> <p>Then in my control, I have this in the code behind:</p> <pre><code>public static readonly DependencyProperty mapProperty = DependencyProperty.Register ( "map", typeof(Map), typeof(DrawRootControl), null ); public Map map { get { return (Map)GetValue(mapProperty); } set { SetValue(mapProperty, value); } } </code></pre> <p>..........</p> <pre><code>public DrawRootControl() { // Required to initialize variables InitializeComponent(); MyDrawObject = new Draw(map) { LineSymbol = CanvasDraw.Resources["DrawLineSymbol"] as LineSymbol, FillSymbol = CanvasDraw.Resources["DrawFillSymbol"] as FillSymbol }; MyDrawObject.DrawComplete += MyDrawObject_DrawComplete; } </code></pre> <p>When I am debugging, my map object in my constructor is null. I thought that if map is created earlier in the mainpage and then passed when I do that binding, it would not be null and would be initialized and created. Maybe I am doing binding incorrectly? I don't really understand the binding thing entirely.</p> <p>Any help would be appreciated. </p>

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