CODEWITHSUNDEEP
c#wpfdata-binding
rbr94
rbr94

Reputation: 2287

WPF: Use PriorityBinding for DisplayMemberBinding in GridViewColumn

I have set a DisplayMemberBinding for a GridViewColumn in WPF. 

<GridViewColumn Header="{x:Static resx:TextResources.ExcutionTimesHeaderErrorType}" DisplayMemberBinding="{Binding Exception, Mode=OneWay, Converter={StaticResource typeConverter}, FallbackValue='---'}"/>

The typeConverter 'imitates' the Exception.GetType() extension to show the type of the exception as string in the Gui. In case there is no exception and this value is null I want to output another property in this column. Now I want to use PriorityBinding as for the DisplayMemberBinding, but neither GridViewColumn does except PriorityBinding as a 'sub-element', nor is it possible to use the DisplayMemberBinding attribute as 'sub-element'. Is there a way of using PriorityBinding for a GridViewColumn like this:

<GridViewColumn Header="{x:Static resx:TextResources.ExcutionTimesHeaderErrorType}">
    <PriorityBinding>
        <Binding Path="Exception" Mode="OneWay" Converter="{StaticResource typeConverter}" IsAsync="True" />
        <Binding Path="AnotherProperty" IsAsync="True" />
    </PriorityBinding>
</GridViewColumn>

EDIT

I changed my code to the suggestion of "ASh" below, but it does not work:

<GridViewColumn Header="{x:Static resx:TextResources.ExcutionTimesHeaderErrorType}">
    <GridViewColumn.DisplayMemberBinding>
        <PriorityBinding  FallbackValue="-*-">
            <Binding Path="Exception" Converter="{StaticResource typeConverter}" Mode="OneWay" IsAsync="True"/>
            <Binding Path="Comment" FallbackValue="---"/>
        </PriorityBinding>
    </GridViewColumn.DisplayMemberBinding>
</GridViewColumn>

The display value is empty, if the Exception property is null. I checked if the second binding property "comment" is set and it is.

These two bindings work properly:

<GridViewColumn Header="{x:Static resx:TextResources.ExcutionTimesHeaderComment}" DisplayMemberBinding="{Binding Comment, FallbackValue='---'}"/>

<GridViewColumn Header="test2" DisplayMemberBinding="{Binding Exception, Mode=OneWay, Converter={StaticResource typeConverter}, FallbackValue='---'}"/>

Upvotes: 0

Views: 818

Answers (1)

ASh
ASh

Reputation: 35713

you are missing <GridViewColumn.DisplayMemberBinding> tag:

<GridViewColumn>
    <GridViewColumn.DisplayMemberBinding>
        <PriorityBinding>
           <Binding Path="Exception" Mode="OneWay" Converter="{StaticResource typeConverter}" IsAsync="True" />
           <Binding Path="AnotherProperty" IsAsync="True" />
        </PriorityBinding>
    </GridViewColumn.DisplayMemberBinding>
</GridViewColumn>

GridViewColumn is marked with ContentProperty attribute and content property is Header: [ContentProperty("Header")]. So the inner content of <GridViewColumn> tag without GridViewColumn. prefix should be assigned to Header property

Upvotes: 1

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