保存为栅格图片-MapControl截图——保存ActiveView为jpg图片

///<summary>Creates a .jpg (JPEG) file from IActiveView. Default values of 96 DPI are used for the image creation.</summary>
///
///<param name="activeView">An IActiveView interface</param>
///<param name="pathFileName">A System.String that the path and filename of the JPEG you want to create. Example: "C:	emp	est.jpg"</param>
/// 
///<returns>A System.Boolean indicating the success</returns>
/// 
///<remarks></remarks>
public System.Boolean CreateJPEGFromActiveView(ESRI.ArcGIS.Carto.IActiveView activeView, System.String pathFileName)
{
  //parameter check
  if (activeView == null || !(pathFileName.EndsWith(".jpg")))
  {
    return false;
  }
  ESRI.ArcGIS.Output.IExport export = new ESRI.ArcGIS.Output.ExportJPEGClass();
  export.ExportFileName = pathFileName;

  // Microsoft Windows default DPI resolution
  export.Resolution = 96;
  ESRI.ArcGIS.Display.tagRECT exportRECT = activeView.ExportFrame;
  ESRI.ArcGIS.Geometry.IEnvelope envelope = new ESRI.ArcGIS.Geometry.EnvelopeClass();
  envelope.PutCoords(exportRECT.left, exportRECT.top, exportRECT.right, exportRECT.bottom);
  export.PixelBounds = envelope;
  System.Int32 hDC = export.StartExporting();
  activeView.Output(hDC, (System.Int16)export.Resolution, ref exportRECT, null, null);

  // Finish writing the export file and cleanup any intermediate files
  export.FinishExporting();
  export.Cleanup();

  return true;
}

源：http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#/Create_JPEG_from_ActiveView_Snippet/004900000064000000/