public class PDFFormat : ExportFormat 

  //Export a layout to PDF

  //Create a PDF export format
  PDFFormat pdf = new PDFFormat()
  {
    OutputFileName = filePath,
    Resolution = 300,
    DoCompressVectorGraphics = true,
    DoEmbedFonts = true,
    HasGeoRefInfo = true,
    ImageCompression = ImageCompression.Adaptive,
    ImageQuality = ImageQuality.Best,
    LayersAndAttributes = LayersAndAttributes.LayersAndAttributes
};

  //Check to see if the path is valid and export
  if (pdf.ValidateOutputFilePath())
  {
    await QueuedTask.Run(() => layout.Export(pdf)); //Export the PDF
  }

//This example demonstrates how to export a layout to PDF.

//Added references
using ArcGIS.Desktop.Core;                         //Project
using ArcGIS.Desktop.Layouts;                      //Layout classes
using ArcGIS.Desktop.Framework.Threading.Tasks;    //QueuedTask
using ArcGIS.Desktop.Mapping;                      //Export formats

public class ExportLayoutToPDFExample
{
  public static Task ExportLayoutToPDFAsync(string LayoutName, string Path)
  {
    //Reference a layoutitem in a project by name
    LayoutProjectItem layoutItem = Project.Current.GetItems<LayoutProjectItem>().FirstOrDefault(item => item.Name.Equals(LayoutName));
    if (layoutItem == null)
      return Task.FromResult<Layout>(null);

    //Create PDF format with appropriate settings
    PDFFormat PDF = new PDFFormat();
    PDF.Resolution = 300;
    PDF.OutputFileName = Path;
    //PDF.Password = "xxx";

    return QueuedTask.Run(() =>
    {
            //Export Layout
            Layout lyt = layoutItem.GetLayout(); //Loads and returns the layout associated with a LayoutItem
            if (PDF.ValidateOutputFilePath())
      {
        lyt.Export(PDF);
      }
    });
  }
}

//This example demonstrates how to export an individual map frame on a layout to PDF.

//Added references
using ArcGIS.Desktop.Core;                         //Project
using ArcGIS.Desktop.Layouts;                      //Layout classes
using ArcGIS.Desktop.Framework.Threading.Tasks;    //QueuedTask
using ArcGIS.Desktop.Mapping;                      //Export formats

public class ExportMapFrameToPDFExample
{
  public static Task ExportMapFrameToPDFAsync(string LayoutName, string MFName, string Path)
  {
    //Reference a layoutitem in a project by name
    LayoutProjectItem layoutItem = Project.Current.GetItems<LayoutProjectItem>().FirstOrDefault(item => item.Name.Equals(LayoutName));
    if (layoutItem == null)
      return Task.FromResult<Layout>(null);

    //Create PDF format with appropriate settings
    PDFFormat PDF = new PDFFormat();
    PDF.Resolution = 300;
    PDF.OutputFileName = Path;
    //PDF.Password = "xxx";

    return QueuedTask.Run(() =>
    {
            //Export MapFrame
            Layout lyt = layoutItem.GetLayout(); //Loads and returns the layout associated with a LayoutItem
            MapFrame mf = lyt.FindElement(MFName) as MapFrame;
      PDF.OutputFileName = Path;
      if (PDF.ValidateOutputFilePath())
      {
        mf.Export(PDF);
      }
    });
  }
}

//This example demonstrates how to export the active mapview to PDF.

//Added references
using ArcGIS.Desktop.Framework.Threading.Tasks;    //QueuedTask
using ArcGIS.Desktop.Mapping;                      //MapView and Export formats

public class ExportActiveMapToPDFExample
{
  public static Task ExportActiveMapToPDFAsync(string Path)
  {
    return QueuedTask.Run(() =>
    {
            //Reference the active map view
            MapView mapv = MapView.Active;

            //Create PDF format with appropriate settings
            PDFFormat PDF = new PDFFormat();
      PDF.Resolution = 300;
      PDF.Height = 500;
      PDF.Width = 800;
      PDF.OutputFileName = Path;

            //Export active map view
            if (PDF.ValidateOutputFilePath())
      {
        mapv.Export(PDF);
      }
    });
  }
}

//Export multiple map series pages to PDF

//Create a PDF export format
PDFFormat msPDF = new PDFFormat()
{
  Resolution = 300,
  OutputFileName = filePath,
  DoCompressVectorGraphics = true
};

//Set up the export options for the map series
MapSeriesExportOptions MSExport_custom = new MapSeriesExportOptions()
{
  ExportPages = ExportPages.Custom,
  CustomPages = "1-3, 5",
  ExportFileOptions = ExportFileOptions.ExportAsSinglePDF,
  ShowSelectedSymbology = false
};

//Check to see if the path is valid and export
if (msPDF.ValidateOutputFilePath())
{
  layout.Export(msPDF, MSExport_custom);  //Export the PDF to a single, multiple page PDF. 
}

PDFFormat PDF = new PDFFormat();

//Export a single page layout to PDF.

//Create a PDF format with appropriate settings
//BMP, EMF, EPS, GIF, JPEG, PNG, SVG, TGA, and TFF formats are also available for export
PDFFormat PDF = new PDFFormat()
{
  OutputFileName = filePath,
  Resolution = 300,
  DoCompressVectorGraphics = true,
  DoEmbedFonts = true,
  HasGeoRefInfo = true,
  ImageCompression = ImageCompression.Adaptive,
  ImageQuality = ImageQuality.Best,
  LayersAndAttributes = LayersAndAttributes.LayersAndAttributes
};

//Check to see if the path is valid and export
if (PDF.ValidateOutputFilePath())
{
  await QueuedTask.Run(() => layout.Export(PDF));  //Export the layout to PDF on the worker thread
}

//Export a map series with multiple pages to a single PDF.

//Create PDF format with appropriate settings
PDFFormat MS_PDF = new PDFFormat()
{
  OutputFileName = filePath,
  Resolution = 300,
  DoCompressVectorGraphics = true,
  DoEmbedFonts = true,
  HasGeoRefInfo = true,
  ImageCompression = ImageCompression.Adaptive,
  ImageQuality = ImageQuality.Best,
  LayersAndAttributes = LayersAndAttributes.LayersAndAttributes
};

//Set up map series export options
MapSeriesExportOptions MS_ExportOptions = new MapSeriesExportOptions()
{
  ExportPages = ExportPages.Custom,  //Provide a specific list of pages
  CustomPages = "1-3, 5",  //Only used if ExportPages.Custom is set
  ExportFileOptions = ExportFileOptions.ExportAsSinglePDF,  //Export all pages to a single, multi-page PDF
  ShowSelectedSymbology = false  //Do no show selection symbology in the output
};

//Export on the worker thread
await QueuedTask.Run(() =>
{
  //Check to see if the path is valid and export
  if (MS_PDF.ValidateOutputFilePath())
  {
    layout.Export(MS_PDF, MS_ExportOptions);  //Export to PDF
  }
});

//Note: Call within QueuedTask.Run()
//Define Export Options
var exportOptions = new ReportExportOptions
{
  ExportPageOption = ExportPageOptions.ExportAllPages,
  TotalPageNumberOverride = 0

};
//Create PDF format with appropriate settings
PDFFormat pdfFormat = new PDFFormat();
pdfFormat.Resolution = 300;
pdfFormat.OutputFileName = path;
report.ExportToPDF($"{report.Name}", pdfFormat, exportOptions, useSelection);