Smrf.NodeXL.ExcelTemplate.TaskAutomator.SaveGraphImageFile C# (CSharp) Method

    SaveGraphImageFile
    (
        NodeXLControl oNodeXLControl,
        IEnumerable<LegendControlBase> oLegendControls,
        String sWorkbookFilePath
    )
    {
        Debug.Assert(oNodeXLControl != null);
        Debug.Assert(oLegendControls != null);
        Debug.Assert( !String.IsNullOrEmpty(sWorkbookFilePath) );

        AutomatedGraphImageUserSettings oAutomatedGraphImageUserSettings =
            new AutomatedGraphImageUserSettings();

        System.Drawing.Size oImageSizePx =
            oAutomatedGraphImageUserSettings.ImageSizePx;

        Int32 iWidth = oImageSizePx.Width;
        Int32 iHeight = oImageSizePx.Height;

        Boolean bIncludeHeader = oAutomatedGraphImageUserSettings.IncludeHeader;
        Boolean bIncludeFooter = oAutomatedGraphImageUserSettings.IncludeFooter;

        Debug.Assert(!bIncludeHeader ||
            oAutomatedGraphImageUserSettings.HeaderText != null);

        Debug.Assert(!bIncludeFooter ||
            oAutomatedGraphImageUserSettings.FooterText != null);

        GraphImageCompositor oGraphImageCompositor =
            new GraphImageCompositor(oNodeXLControl);

        UIElement oCompositeElement = oGraphImageCompositor.Composite(
            iWidth, iHeight,
            bIncludeHeader ? oAutomatedGraphImageUserSettings.HeaderText : null,
            bIncludeFooter ? oAutomatedGraphImageUserSettings.FooterText : null,
            oAutomatedGraphImageUserSettings.HeaderFooterFont, oLegendControls
            );

        System.Drawing.Bitmap oBitmap = WpfGraphicsUtil.VisualToBitmap(
            oCompositeElement, iWidth, iHeight);

        ImageFormat eImageFormat =
            oAutomatedGraphImageUserSettings.ImageFormat;

        String sImageFilePath = Path.ChangeExtension( sWorkbookFilePath,
            SaveableImageFormats.GetFileExtension(eImageFormat) );

        try
        {
            oBitmap.Save(sImageFilePath, eImageFormat);
        }
        catch (System.Runtime.InteropServices.ExternalException)
        {
            // When an image file already exists and is read-only, an
            // ExternalException is thrown.
            //
            // Note that this method is called from the
            // ThisWorkbook.GraphLaidOut event handler, so this exception can't
            // be handled by a TaskAutomator.AutomateOneWorkbook() exception
            // handler.

            FormUtil.ShowWarning( String.Format(
                "The image file \"{0}\" couldn't be saved.  Does a read-only"
                + " file with the same name already exist?"
                ,
                sImageFilePath
                ) );
        }
        finally
        {
            oBitmap.Dispose();

            oGraphImageCompositor.RestoreNodeXLControl();
        }
    }