<TextBlock Text="ROW1 ROW2 ROW3 " DockPanel.Dock="Top" TextTrimming="CharacterEllipsis" Height="40"/> textblock的内容水平方向超出设置TextTrimming="WordEllipsis"属性可以显示“...” textblock的内容垂直方向超出,有办法让它出现“...”吗