Why AlternationIndex returns 0 for all items in ItemsControl?
c#, datatemplate, itemscontrol, wpf
Solution
The `AlternationCount` property of your property needs to be set.
<ItemsControl ItemsSource="{Binding }" AlternationCount={Binding CountOfItems}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
// column definitions
<Label Content="{Binding RelativeSource={RelativeSource
Mode=TemplatedParent},
Path=(ItemsControl.AlternationIndex)}"
/>
// some other controls
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
Problem
I search for some way to show the items index in a `ItemsControl` that is using `DataTemplate`. So I found this good question. I used the idea in that question but all the values are zero! The only different between my code and the code in that question is that my controls (that is going to show the index) is not directly in the `DataTemplate`. It is in a `Grid` and the `Grid` is in the `DataTemplate` Here is my code: ``` <ItemsControl ItemsSource="{Binding }"> <ItemsControl.ItemTemplate> <DataTemplate> <Grid> // column definitions <Label Content="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}, Path=(ItemsControl.AlternationIndex)}"/> // some other controls </Grid> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> ``` Result: ``` 0 0 0 // and so on ``` What I expect to be shown: ``` 0 1 2 // and so on ``` What is wrong whit this code?