If I set ListView Background colors in XAML, they work, but if I set them in code, they don't.
This works:
<telerik:RadListView x:Name="MyList">
<telerik:RadListView.ItemStyle>
<telerik:ListViewItemStyle BackgroundColor="Transparent"/>
</telerik:RadListView.ItemStyle>
<telerik:RadListView.SelectedItemStyle>
<telerik:ListViewItemStyle BackgroundColor="DarkRed"/>
</telerik:RadListView.SelectedItemStyle>
<telerik:RadListView.ItemTemplate>
<DataTemplate>
<telerik:ListViewTemplateCell>
<telerik:ListViewTemplateCell.View>
...
</telerik:ListViewTemplateCell.View>
</telerik:ListViewTemplateCell>
</DataTemplate>
</telerik:RadListView.ItemTemplate>
</telerik:RadListView>This does not:
<telerik:RadListView x:Name="MyList">
<telerik:RadListView.ItemTemplate>
<DataTemplate>
<telerik:ListViewTemplateCell>
<telerik:ListViewTemplateCell.View>
...
</telerik:ListViewTemplateCell.View>
</telerik:ListViewTemplateCell>
</DataTemplate>
</telerik:RadListView.ItemTemplate>
</telerik:RadListView>// Constructor
public MyListView()
{
InitializeComponent();
MyList.ItemStyle.BackgroundColor = Colors.Transparent;
MyList.SelectedItemStyle.BackgroundColor = Colors.DarkRed;
}Defining the BackgroundColor in code in this way generates an exception. What am I doing wrong?
(Using: Telerik.UI.for.Maui 5.1.0)
1 Answer, 1 is accepted
Hi Brad,
The reason for the exception is because you're assigning a color value to a null object. Let me take a step back to better explain.
When you define an object in XAML it becomes an instance of that object. In this situation, notice how you're not directly setting a property of RadListView with the color value... instead you're creating an instance of ListViewItemStyle setting the color of that, and finally assigning that new instance to the RadListView's ItemStyle/SelectedItemStyle properties.
So, if you're going to do that in code-behind, you must also create the instances of ListViewItemStyle
public MyListView()
{
InitializeComponent();
MyList.ItemStyle = new ListViewItemStyle { BackgroundColor = Colors.Transparent };
MyList.SelectedItemStyle = new ListViewItemStyle { BackgroundColor = Colors.DarkRed };
}Let me know if you have any further trouble.
Regards,
Lance | Manager Technical Support
Progress Telerik
[edit] Fixed misspellings.
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Rank 2
Hi Lance, thanks for the explanation. I had assumed there would be default objects already applied.
Cheers,
Brad