WPF. Must have non-null value for 'Property' for multitrigger condition
c#, wpf, xaml
Solution
You'll want to use a MultiDataTrigger in this case. A MultiTrigger can only be triggered by dependency properties.
Problem
Have multitrigger, one of the conditions is not null, so if StowedAssetDetailedThumbnailViewModel != null then set template ``` <Style.Triggers> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property="IsSelected" Value="true" /> <Condition Binding="{Binding Path=StowedAssetDetailedThumbnailViewModel, Converter={StaticResource isNull}}" Value="False"/> </MultiTrigger.Conditions> <Setter Property="Template" Value="{StaticResource SelectedTemplate}" /> </MultiTrigger> </Style.Triggers> ``` Using simple converter: ``` return isNull == null; ``` the error is Must have non-null value for Property UPDATE: Thanks, the final solution is ``` <Style.Triggers> <MultiDataTrigger> <MultiDataTrigger.Conditions> <Condition Binding="{Binding IsSelected, RelativeSource={RelativeSource Self}}" Value="true" /> <Condition Binding="{Binding Path=StowedAssetDetailedThumbnailViewModel, Converter={StaticResource isNull}}" Value="false"/> </MultiDataTrigger.Conditions> <Setter Property="Template" Value="{StaticResource SelectedTemplate}" /> </MultiDataTrigger> </Style.Triggers> ```