Smrf.NodeXL.ExcelTemplate.VertexWorksheetReader.ReadImageUri C# (CSharp) Method

    ReadImageUri
    (
        ExcelTableReader.ExcelTableRow oRow,
        IVertex oVertex,
        VertexRadiusConverter oVertexRadiusConverter,
        Nullable<Single> oVertexImageSize
    )
    {
        Debug.Assert(oRow != null);
        Debug.Assert(oVertex != null);
        Debug.Assert(oVertexRadiusConverter != null);
        AssertValid();

        String sImageUri;

        if ( !oRow.TryGetNonEmptyStringFromCell(
            VertexTableColumnNames.ImageUri, out sImageUri) )
        {
            return (false);
        }

        if ( sImageUri.ToLower().StartsWith("www.") )
        {
            // The Uri class thinks that "www.somewhere.com" is a relative
            // path.  Fix that.

            sImageUri= "http://" + sImageUri;
        }

        Uri oUri;

        // Is the URI either an URL or a full file path?

        if ( !Uri.TryCreate(sImageUri, UriKind.Absolute, out oUri) )
        {
            // No.  It appears to be a relative path.

            Range oCell = oRow.GetRangeForCell(
                VertexTableColumnNames.ImageUri);

            String sWorkbookPath =
                ( (Workbook)(oCell.Worksheet.Parent) ).Path;

            if ( !String.IsNullOrEmpty(sWorkbookPath) )
            {
                sImageUri = Path.Combine(sWorkbookPath, sImageUri);
            }
            else
            {
                OnWorkbookFormatError( String.Format(

                    "The image file path specified in cell {0} is a relative"
                    + " path.  Relative paths must be relative to the saved"
                    + " workbook file, but the workbook hasn't been saved yet."
                    + "  Either save the workbook or change the image file to"
                    + " an absolute path, such as \"C:\\MyImages\\Image.jpg\"."
                    ,
                    ExcelUtil.GetRangeAddress(oCell)
                    ),

                    oCell
                    );
            }
        }

        // Note that sImageUri may or may not be a valid URI string.  If it is
        // not, GetImageSynchronousIgnoreDpi() will return an error image.

        ImageSource oImage =
            ( new WpfImageUtil() ).GetImageSynchronousIgnoreDpi(sImageUri);

        if (oVertexImageSize.HasValue)
        {
            // Resize the image.

            Double dLongerDimension =
                oVertexRadiusConverter.WorkbookToLongerImageDimension(
                    oVertexImageSize.Value);

            Debug.Assert(dLongerDimension >= 1);

            oImage = ( new WpfImageUtil() ).ResizeImage(oImage,
                (Int32)dLongerDimension);
        }

        oVertex.SetValue(ReservedMetadataKeys.PerVertexImage, oImage);

        return (true);
    }