CODEWITHSUNDEEP
wpfdata-bindingdatagrid
Arsen Mkrtchyan
Arsen Mkrtchyan

Reputation: 50712

Reset dependency property value from binding

Say I have a Grid, with a lot of cells on it, and I bind background of this cell to some property of my data class in a style (actually data class property is type of Color, but this is not an issue, because we can use a converter to convert it to a Brush),

Now when some condition in my data class is true I want the background to be red, and if not, I want it to be the default value, data may change, so condition may become true and false, and I should fill Background red or default

I know about Binding.DoNothing and DependencyProperty.UnsetValue both are not case, I tried also Cell.BackgroundProperty.DefaultValue but it is null.

So Is there any value, that I can return from my bound data property, to force the dependency property to reset its value?

Thanks!

Upvotes: 0

Views: 470

Answers (1)

brunnerh
brunnerh

Reputation: 184506

If you only have a boolean property that is quite convenient as you can use a DataTrigger and just bind the value if the property is true, that way the property is not always bound.

<Style.Triggers>
    <DataTrigger Binding="{Binding MyCondition}" Value="True">
        <Setter Property="Background" Value="Red"/>
    </DataTrigger>
</Style.Triggers>

If you only have the decision between default and red you do not even need the additional property or any binding at all.

(Resetting values is not possible in a binding to my knowledge)

Upvotes: 1

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