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POLoad xaml viewmodel at run-time with windows phone
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  1. POLoad xaml viewmodel at run-time with windows phone
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    copied!<p>I'm currently following a windows phone tutorial from Microsoft virtual academy and one of the challenges was to use the design xaml viewmodel that was created in the project and loaded at run-time.</p> <p>After researching this for hours, I thought it was time to resort to stackoverflow as I'm not getting anywhere. I've read numerous articles and none are giving me a correct answer, so I've got a few questions:</p> <ol> <li>How to fix my error?</li> <li>How to load the xaml model view at run-time programmatically?</li> <li>How to load the xaml model view at run-time using xaml?</li> <li>Where to call the loading of the xaml at run-time </li> </ol> <p>The sample data file i.e. SoundViewModelSampleData.xaml, looks like this:</p> <pre><code>&lt;vm:SoundViewModel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:Soundboard.ViewModels" xmlns:mo="clr-namespace:Soundboard.Models"&gt; &lt;vm:SoundViewModel.Animals&gt; &lt;vm:SoundGroupViewModel Title="Animals Sample"&gt; &lt;vm:SoundGroupViewModel.Items&gt; &lt;mo:SoundDataModel Title="Animals 1" FilePath="Animals.wav" /&gt; &lt;/vm:SoundGroupViewModel.Items&gt; &lt;/vm:SoundGroupViewModel&gt; &lt;/vm:SoundViewModel.Animals&gt; &lt;vm:SoundViewModel.Cartoons&gt; &lt;vm:SoundGroupViewModel Title="Cartoons Sample"&gt; &lt;vm:SoundGroupViewModel.Items&gt; &lt;mo:SoundDataModel Title="Cartoons 1" FilePath="Cartoons.wav" /&gt; &lt;mo:SoundDataModel Title="Cartoons 2" FilePath="Cartoons.wav" /&gt; &lt;/vm:SoundGroupViewModel.Items&gt; &lt;/vm:SoundGroupViewModel&gt; &lt;/vm:SoundViewModel.Cartoons&gt; &lt;/vm:SoundViewModel&gt; </code></pre> <p>The simplest code to load this programmatically that I found was:</p> <pre><code>string path = @".\SampleData\SoundViewModelSampleData.xaml"; using (System.IO.StreamReader reader = new System.IO.StreamReader(path)) { SoundViewModel vm = XamlReader.Load(reader.ReadToEnd()) as SoundViewModel; } </code></pre> <p>While I'm probably calling it from the wrong location for now, I'm getting the following error:</p> <blockquote> <p>A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in System.Windows.ni.dll</p> <p>{System.Windows.Markup.XamlParseException: Unknown parser error: Scanner 2147500037. [Line: 5 Position: 14] at MS.Internal.XcpImports.CreateFromXaml(String xamlString, Boolean createNamescope, Boolean requireDefaultNamespace, Boolean allowEventHandlers, Boolean expandTemplatesDuringParse, Boolean trimDeclaredEncoding) at System.Windows.Markup.XamlReader.Load(String xaml) at Soundboard.ViewModels.SoundViewModel.LoadData()}</p> <p><strong>Unknown parser error: Scanner 2147500037. [Line: 5 Position: 14]</strong></p> </blockquote> <p>Assuming I can resolve this error, this would take care of my question 1 &amp; 2 (fixing error and loading the data programmatically)</p> <p>Can you spot what's causing this problem?</p> <p>As mentioned above, I'm probably loading this in the wrong place i.e. from within my ViewModel when it is created when the app loads.</p> <pre><code>namespace Soundboard.ViewModels { public class SoundViewModel { public SoundGroupViewModel Animals { get; set; } public SoundGroupViewModel Cartoons { get; set; } public bool IsDataLoaded { get; set; } public void LoadData() { string path = @".\SampleData\SoundViewModelSampleData.xaml"; using (System.IO.StreamReader reader = new System.IO.StreamReader(path)) { SoundViewModel vm = System.Windows.Markup.XamlReader.Load(reader.ReadToEnd()) as SoundViewModel; } IsDataLoaded = true; } } </code></pre> <p>}</p> <p>And in my app.xaml.cs I have the following:</p> <pre><code>public static SoundViewModel SoundViewModel { get { if (_soundViewModel == null) { _soundViewModel = new SoundViewModel(); _soundViewModel.LoadData(); } return _soundViewModel; } } </code></pre> <p>Now how can I achieve the same using just xaml for the run-time and use d:datacontext for design-time.</p> <p>I've read a few articles but they are all for wpf but most are related to loading usercontrol, etc.. but not a viewmodel</p> <p>Any help would be greatly appreciated.</p> <p>Thanks.</p>
 

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