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POXAML Automatic Type Conversion
 

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    <p>I've noticed it's possible to return a string like "Visible", "Collapsed", "Images/xyz.png" or "#FFB3D1" from a value converter and the magic of bindings manages to figure it out. Hide/Show the UI Element, find the xyz.png image or colour something pink...</p> <p>I've taken this for granted for a long time, it now it doesn't work with my latest code, So my Question is how can I manually call this functionality?</p> <hr /> <p><strong>Explanation:</strong></p> <p>I've scaled up by creating a custom MarkupExtension, which attaches a MultiConverter attaches it to a MultiBinding and returns the initialised binding. However when this multi converter returns strings like "#FFB3D1" or "Red", nothing seems to happen.</p> <pre><code>// PseudoCode from my MarkupExtension, setting up &amp; returning the binding/multi-converter public override object ProvideValue( IServiceProvider serviceProvider ) { MultiBinding outputBinding = new MultiBinding(); foreach ( Binding b in bindings ) { outputBinding.Bindings.Add( b ); } outputBinding.Converter = converter; return outputBinding.ProvideValue( serviceProvider ); } </code></pre> <p>I presume that because I'm creating the Multibinding + Converter in code, it's skipping a step somewhere in the <code>Binding.Magic</code> namespace.</p> <hr /> <p><strong>Solution:</strong></p> <pre><code> public override object ProvideValue( IServiceProvider serviceProvider ) { // get targets IProvideValueTarget serv = (IProvideValueTarget)serviceProvider.GetService( typeof( IProvideValueTarget ) ); // get Type Converter object[] typeConverterAttributes = ( (DependencyProperty)serv.TargetProperty ).PropertyType.GetCustomAttributes( typeof( TypeConverterAttribute ), true ); TypeConverter typeConverter = null; if ( typeConverterAttributes.Length &gt; 0 ) { TypeConverterAttribute attr = (TypeConverterAttribute)typeConverterAttributes[0]; typeConverter = (TypeConverter)Activator.CreateInstance( Type.GetType( attr.ConverterTypeName ), false ); } </code></pre> <p>It is then simply a case of applying the Type Converter manually</p>
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    1. COThe TypeConverter attribute can also be declared on the property's type, for example, on the Brush class itself. You might want your code to check there too.
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