How to use global setting to set cell color by column's IsReadOnly Propperty?

[nasterhe]

I use this code,but didn't work.
<Style Selector="DataGridCell"> <Setter Property="Background" Value="{Binding IsReadOnly, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=DataGridColumn},Converter={StaticResource BrushConvert}}"/> </Style>

[tobyfirth]

I think By Property Matching is what you would want to use in the selector.

<Style Selector="DataGridCell[IsReadOnly=true]">
    <Setter Property="Background" Value="Red" />
</Style>

[nasterhe]

I think By Property Matching is what you would want to use in the selector.

<Style Selector="DataGridCell[IsReadOnly=true]">
    <Setter Property="Background" Value="Red" />
</Style>

Thanks，But DataGridCell can't has IsReadOnly property,which property blong to DataGridColumn.