.ruler{width:300px;/*Adjustasneeded*/height:20px;background-color:#f0f0f0;border:1pxsolid#ccc;position:relative;}.ruler::before{content:"";position:absolute;top:0;left:0;width:100%;height:1

xaml部分主要代码：<Canvasx:Name="cvRuler"Margin="0"Background="WhiteSmoke"TextBlock.Foreground="Black"/>后台主要代码1//画标尺2privatevoidDrawRule()3{45if(cvRuler.