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POUnknown property 'Converter' for type 'MS.Internal.Markup.MarkupExtensionParser+UnknownMarkupExtension' encountered while parsing a Markup Extension
 

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  1. POUnknown property 'Converter' for type 'MS.Internal.Markup.MarkupExtensionParser+UnknownMarkupExtension' encountered while parsing a Markup Extension
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    <p>I am binding to an ObservableCollection called ScaleFactor to a ComboBox. The value of the ObservableCollection are simply 1, 2, 4 and 8. I want to use an IValueConverter to change these values to x1, x2, x4 and x8.</p> <p>My MainWindow.xaml</p> <pre><code>&lt;Window x:Class="TimeLineCanvas.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:timeline="clr-namespace:TimeLineCanvas.UserControls" xmlns:helper="clr-namespace:TimeLineCanvas.Helpers" Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;Grid.Resources&gt; &lt;helper:ZoomConverter x:Key="ZoomConverter" /&gt; &lt;/Grid.Resources&gt; &lt;StackPanel&gt; &lt;ComboBox ItemsSource="{Binding SSS}" HorizontalAlignment="Left" &gt; &lt;ComboBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding, Converter={StaticResource ZoomConverter}}" /&gt; &lt;/DataTemplate&gt; &lt;/ComboBox.ItemTemplate&gt; &lt;/ComboBox&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>And the code behind</p> <pre><code>using System; using System.Windows; using System.ComponentModel; using System.Collections.ObjectModel; namespace TimeLineCanvas { /// &lt;summary&gt; /// Interaction logic for MainWindow.xaml /// &lt;/summary&gt; public partial class MainWindow : Window { #region Constructors public MainWindow() { InitializeComponent(); SSS = new ObservableCollection&lt;int&gt;(); SSS.Add(1); SSS.Add(2); this.DataContext = this; } #endregion public ObservableCollection&lt;int&gt; SSS { get; set; } } } </code></pre> <p>And the converter</p> <pre><code>using System; using System.Windows.Data; namespace TimeLineCanvas.Helpers { public class ZoomConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return "x" + value.ToString(); } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } } } </code></pre> <p>I don't know why this is, I'm not using MarkupExtensions so I don't think <a href="https://stackoverflow.com/questions/11785248/error-when-binding-using-markup-extensions-unknown-property-encountered-while-p">this link helps</a>. Can any one shed any light?</p>
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    1. COYou are binding to `ScaleFactor` which would imply that's singular. Is that of type IEnumerable?
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    2. COI updated my comment, but I am using public ObservableCollection<int> ScaleFactor { get; set; } - there are always 4 items
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    3. COI don't see anything wrong with what you have. Try doing ... `{Binding ., Converter` (dot then a comma)
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      1. POUnknown property 'Converter' for type 'MS.Internal.Markup.MarkupExtensionParser+UnknownMarkupExtension' encountered while parsing a Markup Extension
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