public class TIFFFormat : ExportFormat 

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

//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 ExportLayoutToTIFFExample
{
  public static Task ExportLayoutToTIFFAsync(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 TIFF format with appropriate settings
    TIFFFormat TIFF = new TIFFFormat();
    TIFF.Resolution = 300;
    TIFF.OutputFileName = Path;

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

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

//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 ExportMapFrameToTIFFExample
{
  public static Task ExportMapFrameToTIFFAsync(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 TIFF format with appropriate settings
    TIFFFormat TIFF = new TIFFFormat();
    TIFF.Resolution = 300;
    TIFF.OutputFileName = Path;

    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;
      TIFF.OutputFileName = Path;
      if (TIFF.ValidateOutputFilePath())
      {
        mf.Export(TIFF);
      }
    });
  }
}

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

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

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

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

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

//Export multiple map series pages to TIFF

//Create a TIFF export format
TIFFFormat msTIFF = new TIFFFormat()
{
  Resolution = 300,
  OutputFileName = filePath,
  ColorMode = TIFFColorMode.TwentyFourBitTrueColor,
  HasGeoTiffTags = true,
  HasWorldFile = true
};

//Set up the export options for the map series
MapSeriesExportOptions MSExport_All = new MapSeriesExportOptions()
{
  ExportPages = ExportPages.All,
  ExportFileOptions = ExportFileOptions.ExportMultipleNames,
  ShowSelectedSymbology = false
};

//Check to see if the path is valid and export
if (msPDF.ValidateOutputFilePath())
{
  layout.Export(msPDF, MSExport_All);  //Export each page to a TIFF and apppend the page name suffix to each output file 
}

TIFFFormat TIFF = new TIFFFormat();

//Export each page of a map series to an individual TIFF file.

//Create TIFF format with appropriate settings
TIFFFormat TIFF = new TIFFFormat()
{
  OutputFileName = filePath,
  Resolution = 300,
  ColorMode = TIFFColorMode.TwentyFourBitTrueColor,
  HasGeoTiffTags = true,
  HasWorldFile = true,
  ImageCompression = TIFFImageCompression.LZW
};

//Set up map series export options
MapSeriesExportOptions MSExportOptions_TIFF = new MapSeriesExportOptions()
{
  ExportPages = ExportPages.All,  //All pages
  ExportFileOptions = ExportFileOptions.ExportMultipleNames,  //Export each page to an individual file using page name as a suffix.
  ShowSelectedSymbology = true  //Include selection symbology in the output
};

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