WPF DataTemplate Binding BUG: AmbiguousMatchException

Question

Hello!

Here are the DataTemplates:

<DataTemplate DataType="{x:Type data:Item}" x:Key="ItemTemplate">
    <Border/>
</DataTemplate>

<DataTemplate DataType="{x:Type data:StyleItem}" x:Key="StyleItemTemplate">
    <Border>
        <ContentControl Content="{Binding Item}" 
                ContentTemplate="{StaticResource ItemTemplate}"/>
    </Border>
</DataTemplate>

I am trying to bind a List<StyleItem> to an ItemsControl,
setting ItemTemplate="{StaticResource StyleItemTemplate}", but then I get a System.Reflection.AmbiguousMatchException.

I read this post, and althoug the StyleItem and Item classes are not generic classes, anyhow; I don't know how to use the parenthsis solution in my situation.

The Item and StyleItem classes are generated EF entities that inherit from System.Data.Objects.DataClasses.EntityObject, and implement System.ComponentModel.IDataErrorInfo.

Answer 1

You should either use the x:Key property or the DataType property.

You must not use both. So remove either one to get it to work! I suggest removing the DataType property, since you already use the keys in your example!

Answer 2

This smells like a collision between your StyleItem.Item property and the property indexer defined in IDataErrorInfo. Try changing the name of your StyleItem.Item property to something else.