问题是您
DataContext将UserControl的显式设置为其自身：
DataContext="{Binding Mode=OneWay, RelativeSource={RelativeSource Self}}删除该分配并编写如下
ItemName绑定：
<TextBlock Text="{Binding ItemName, RelativeSource={RelativeSource AncestorType=UserControl}}"/>或像这样
<TextBlock Text="{Binding ItemName, ElementName=ItemRowControl}"/>
