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2013-11-26T23:10:01.360
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This <a href="http://blogs.msdn.com/b/mim/archive/2013/03/11/tips-winrt-converter-parameter-binding.aspx" rel="nofollow">blog post</a> explains a work around for the problem. The idea is to create a <a href="http://msdn.microsoft.com/en-us/library/ms752914%28v=vs.110%29.aspx" rel="nofollow">dependency property</a> on your converter. You can then bind your <code>StoreId</code> to this, instead of using the <code>ConverterParameter</code>. So on your <code>UserIdToNameConverter</code>, you need to inherit from <code>DependencyObject</code>, and add the dependency property: <pre><code>public class UserIdToNameConverter : DependencyObject, IValueConverter { public string StoreId { get { return (string) GetValue(StoreIdProperty); } set { SetValue(StoreIdProperty, value); } } public static readonly DependencyProperty StoreIdProperty = DependencyProperty.Register("StoreId", typeof (string), typeof (UserIdToNameConverter), new PropertyMetadata(string.Empty)); public object Convert(object value, Type targetType, object parameter, string language) { //Your current code //Can now use StoreId instead of ConverterParameter } public object ConvertBack(object value, Type targetType, object parameter, string language) { //Same as above; } } </code></pre> You can then bind to this dependency property within your view's resources: <pre><code><UserControl.Resources> <UserIdToNameConverter x:Key="UserIdToNameConverter" StoreId="{Binding StoreId}"/> </UserControl.Resources> </code></pre> This is assuming your view's <code>DataContext</code> is set to the <code>CustomersViewModel</code> where it can find the <code>StoreId</code> property. You can then use the converter the same way as you have in your question. As a side note, it won't work if you create the converter within the <code>ItemTemplate</code> instead of inside the <code>Resources</code>. See the blog post for more information. All credit goes to the blog's author, Sebastien Pertus.
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