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PO.NET 4.5 Metro Application DependencyProperty
 

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  1. PO.NET 4.5 Metro Application DependencyProperty
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    <p>I cant get <code>DependencyProperty.Register</code> to work. </p> <p>It requires <code>(string, string, string, PropertyMetadata)</code> instead of <code>string, Type, Type, UIPropertyMeatdata)</code>... </p> <p>I changed the UI-PropertyMetadata part but can't get string part of it to work. I tried <code>typeof(T).ToString()</code> and just <code>"T"</code> but it doesn't work. </p> <p>My code looks like this</p> <pre><code>public ObservableCollection&lt;RingSegment&gt; RingSegments { get { return (ObservableCollection&lt;RingSegment&gt;)GetValue(RingSegmentsProperty); } set { SetValue(RingSegmentsProperty, value); } } public static readonly DependencyProperty RingSegmentsProperty = DependencyProperty.Register( "RingSegments", typeof(ObservableCollection&lt;RingSegment&gt;), typeof(MainPage), new PropertyMetadata(new ObservableCollection&lt;RingSegment&gt;())); </code></pre> <p>And errors that i get</p> <p><code>Error 1 The best overloaded method match for 'Windows.UI.Xaml.DependencyProperty.Register(string, string, string, Windows.UI.Xaml.PropertyMetadata)' has some invalid arguments C:\Users\aleksandar.toplek\documents\visual studio 11\Projects\Project - XX\XX\MainPage.xaml.cs 21 68 XX</code></p> <p><code>Error 2 Argument 2: cannot convert from 'System.Type' to 'string' C:\Users\aleksandar.toplek\documents\visual studio 11\Projects\Project - XX\XX\MainPage.xaml.cs 22 20 XX</code></p> <p><code>Error 3 Argument 3: cannot convert from 'System.Type' to 'string' C:\Users\aleksandar.toplek\documents\visual studio 11\Projects\Project - XX\XX\MainPage.xaml.cs 22 63 XX</code></p> <p>-- EDIT --</p> <p>When I do this</p> <pre><code>public static readonly DependencyProperty RingSegmentsProperty = DependencyProperty.Register( "RingSegments", "ObservableCollection&lt;RingSegment&gt;", "MainPage", new PropertyMetadata(new ObservableCollection&lt;RingSegment&gt;())); </code></pre> <p>Code compiles but throws exception in runtime</p> <p><code>A first chance exception of type 'System.TypeInitializationException' occurred in mscorlib.dll</code></p> <p>in file <code>XamplTypeIngo.g.cs</code></p> <pre><code>System.TypeInitializationException was unhandled by user code Message=The type initializer for 'XX.MainPage' threw an exception. Source=mscorlib TypeName=XX.MainPage StackTrace: at System.Runtime.CompilerServices.RuntimeHelpers._RunClassConstructor(RuntimeType type) at System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor(RuntimeTypeHandle type) at Disk_Visualizer.XamlTypeInfo.XamlUserType.RunInitializer() in c:\Users\aleksandar.toplek\Documents\Visual Studio 11\Projects\Project - XX\XX\obj\Debug\XamlTypeInfo.g.cs:line 277 InnerException: System.NullReferenceException Message=Object reference not set to an instance of an object. Source=Windows.UI.Xaml StackTrace: at Windows.UI.Xaml.DependencyProperty.Register(String name, String propertyTypeName, String ownerTypeName, PropertyMetadata typeMetadata) at Disk_Visualizer.MainPage..cctor() in c:\Users\aleksandar.toplek\Documents\Visual Studio 11\Projects\Project - XX\XX\MainPage.xaml.cs:line 21 InnerException: ... </code></pre>
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    1. USKate Gregory
    1. USAleksandar Toplek
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      1. VTUpMod
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    1. COFrom the code, it seems like a bug. What type do you get when you assign the typeof(xxxx) to static members. And then what happens during compile?
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      1. USRitch Melton
    2. COThose errors are from compiler. I don't understand what you mean by `when you assign the typeof(xxxx) to static members`
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      1. USAleksandar Toplek
    3. COInstead of saying typeof(MainPage) in the arguments, can you add a static member that the DependencyProperty can use in its arguments. It seems like the compiler thinks the typeof(xx) should be strings, I just wonder if it thinks the same thing for an explicitly declared member.
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      1. PO.NET 4.5 Metro Application DependencyProperty
      1. USRitch Melton
 

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