Databases
StackOverflow2013
Postsdbo
POGet value of canvas mustn't return null
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POGet value of canvas mustn't return null
    primarykey
    data
    text
    <p>In MainPage.xaml I have 2 canvas controls (bd1 and ball) that represent 2 layers.</p> <pre><code> &lt;Canvas x:Name="ContentCanvas" Width="354" Height="669"&gt; &lt;Canvas.Background&gt; &lt;RadialGradientBrush&gt; &lt;GradientStop Color="#FF9D0A0A" Offset="0" /&gt; &lt;GradientStop Color="Black" Offset="1" /&gt; &lt;/RadialGradientBrush&gt; &lt;/Canvas.Background&gt; &lt;Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Name="bd1" Width="370" Height="480" Clip="F1 M 0,0L 640,0L 640,480L 0,480L 0,0" MouseMove="Canvas_MouseMove" HorizontalAlignment="Left" VerticalAlignment="Top"&gt; &lt;Canvas.RenderTransform&gt; &lt;TransformGroup&gt; &lt;RotateTransform Angle="0" CenterX="0.5" CenterY="0.5" /&gt; &lt;TranslateTransform X="0" Y="0" /&gt; &lt;ScaleTransform ScaleX="1" ScaleY="1" /&gt; &lt;SkewTransform AngleX="0" AngleY="0"/&gt; &lt;/TransformGroup&gt; &lt;/Canvas.RenderTransform&gt; &lt;Path....../&gt; ........ &lt;/Canvas&gt; &lt;Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Name="ball" Width="54" Height="52.5" Clip="F1 M 0,0L 54,0L 54,52.5L 0,52.5L 0,0" MouseMove="Canvas_MouseMove" HorizontalAlignment="Left" VerticalAlignment="Top"&gt; &lt;Canvas.RenderTransform&gt; &lt;TransformGroup&gt; &lt;RotateTransform Angle="0" CenterX="0.5" CenterY="0.5" /&gt; &lt;TranslateTransform X="0" Y="0" /&gt; &lt;ScaleTransform ScaleX="1" ScaleY="1" /&gt; &lt;SkewTransform AngleX="0" AngleY="0"/&gt; &lt;/TransformGroup&gt; &lt;/Canvas.RenderTransform&gt; &lt;Canvas Width="640" Height="480.425" Canvas.Left="0" Canvas.Top="0"&gt; &lt;Ellipse x:Name="Ellipse" Width="54" Height="52.5" Canvas.Left="4.17233e-007" Canvas.Top="2.03252e-005" Stretch="Fill" StrokeLineJoin="Round" Stroke="#FFFF0000"&gt; &lt;Ellipse.Fill&gt; &lt;LinearGradientBrush StartPoint="0.0633299,0.762378" EndPoint="0.93667,0.237621"&gt; &lt;LinearGradientBrush.GradientStops&gt; &lt;GradientStop Color="#FF000000" Offset="0"/&gt; &lt;GradientStop Color="#FFFFFFFF" Offset="1"/&gt; &lt;/LinearGradientBrush.GradientStops&gt; &lt;/LinearGradientBrush&gt; &lt;/Ellipse.Fill&gt; &lt;/Ellipse&gt; &lt;/Canvas&gt; &lt;/Canvas&gt; </code></pre> <p>For that I created a class called Layer that has a Canvas property :</p> <pre><code> public class Layer { public Layer() { } public Layer(Canvas canvas, Tipologie tip) { ThisCanvas = canvas; Tip = tip; } public string Name { get; set; } private Canvas canv; public Canvas ThisCanvas { get { return canv; } set { canv = value; if (value != null) Name = value.GetValue(Canvas.NameProperty) as string; } } } </code></pre> <p>In the <code>MainPage</code> class I have a global collection of <code>Layer</code> type. Initially I put in the collection 2 layers.</p> <pre><code> private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e) { Layers[0] = new Layer(); Layers[0].ThisCanvas = GetTemplateChild("bd1") as Canvas; Layers[1] = new Layer(); Layers[1].ThisCanvas = ball; LayerSelector.ItemsSource = Layers; } Layer[] Layers = new Layer[2]; </code></pre> <p>The problem is that bd1 and ball canvas controls are <code>null</code> . I also tried to put the code in the constructor of the page but it was the same problem. </p> <p>I can't explain that. </p> <p>Am I doing something wrong? Thanks in advance!</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USRadu Stefan
    1. USRadu Stefan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POGet value of canvas mustn't return null
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POGet value of canvas mustn't return null
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POGet value of canvas mustn't return null
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload