咱們能夠經過Spire.PDF 的幫助來切換PDF圖層的可見性,同時建立新的頁面層。html
Step 1:建立一個新的PDF文檔,並向PDF文檔添加一個新頁面。orm
PdfDocument pdf = new PdfDocument(); PdfPageBase page = pdf.Pages.Add();
Step 2:將一個名爲「藍線」的圖層添加到PDF頁面,並將圖層設置爲不可見。htm
PdfPageLayer layer = page.PageLayers.Add("Blue line", false); layer.Graphics.DrawLine(new PdfPen(PdfBrushes.Blue, 1), new PointF(0, 30), new PointF(300, 30));
Step 3:將一個名爲「橢圓」的圖層添加到PDF頁面,並將圖層設置爲可見。blog
layer = page.PageLayers.Add("Ellipse", true); PdfPen pen = new PdfPen(Color.Green, 1f); PdfBrush brush = new PdfSolidBrush(Color.Green); layer.Graphics.DrawEllipse(pen, brush, 50, 70, 200, 60);
Step 4:將文檔保存到文件。圖片
pdf.SaveToFile("LayerVisibility.pdf", FileFormat.PDF);
效果截圖:ip
完整代碼:文檔
static void Main(string[] args) { PdfDocument pdf = new PdfDocument(); PdfPageBase page = pdf.Pages.Add(); PdfPageLayer layer = page.PageLayers.Add("Blue line", false); layer.Graphics.DrawLine(new PdfPen(PdfBrushes.Blue, 1), new PointF(0, 30), new PointF(300, 30)); layer = page.PageLayers.Add("Ellipse", true); PdfPen pen = new PdfPen(Color.Green, 1f); PdfBrush brush = new PdfSolidBrush(Color.Green); layer.Graphics.DrawEllipse(pen, brush, 50, 70, 200, 60); pdf.SaveToFile("LayerVisibility.pdf", FileFormat.PDF); }
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