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我申請的TraceLevel到DataGrid這樣WPF的TraceLevel問題
<DataGrid HorizontalAlignment="Stretch" Margin="12,12,12,12" VerticalAlignment="Stretch" ItemsSource="{Binding Vals, PresentationTraceSources.TraceLevel=High}" />
但它不會產生任何跟蹤輸出。怎麼了?