Add DataBinding to Model in DataTriggers

Question

I have an ObservableCollection<MyClass>. And MyClass has a property called IsColored

I created a ListView, which should will color all the rows who have the property IsColored to true.

<ListView ItemsSource="{Binding MyClassList}">
    <hControls:ListView.Style>
        <Style TargetType="ListView">
            <Setter Property="Foreground" Value="Blue" />
        </Style>
    </hControls:ListView.Style>

...

</ListView>

To satisfy the condition of Colors to my ListView I should add a DataTrigger

<Style.Triggers>
    <Trigger Property="IsColored" Value="True">
        <Setter Property="Foreground" Value="Blue" />
    </Trigger>
</Style.Triggers>

But the problem is that IsColored is not recognized.

How can add a Binding to that property so I can access to it from the DataTrigger ?

Answer 1

I'm not sure why @Anatoliy gave up so quickly and deleted his answer, because he was right... you do need to use a DataTrigger:

<Style.Triggers>
    <DataTrigger Binding="{Binding IsColored}" Value="True">
        <Setter Property="Foreground" Value="Blue" />
    </DataTrigger>
</Style.Triggers>

You commented to say that you got this error when trying this code:

Cannot resolve property 'IsColored' in data context of type MyNameSpace.MyUserControl

This just means that your Style does not have access to the items of the ListView. Looking at your code, it seems as though you are trying to define a Style for a ListViewItem, but within a ListView Style. Instead, you need to use the ListView.ItemContainerStyle Property to apply the Style to the individual items. Try this instead:

<ListView ItemsSource="{Binding MyClassList}">
    <ListView.ItemContainerStyle>
        <Style TargetType="{x:Type ListViewItem}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsColored}" Value="True">
                    <Setter Property="Foreground" Value="Blue" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ListView.ItemContainerStyle>    
    ...    
</ListView>

Answer 2

In first case you using the regular Style.Trigger, the DataTrigger using like this:

<DataTrigger Bindind="{Binding Path=IsColored}" Value="True">
    <Setter Property="Foreground" Value="Blue" />
</DataTrigger>

About this error:

Cannot resolve property 'IsColored' in data context of type MyNameSpace.MyUserControl

It tells, what you don't correctly setting the DataContext.