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Header in document is getting removed

Hello
I have a word document with header and footer predefined. I have used following code to add watermark in word document. The problem is it is removing the header from my word document.

private static void InsertWatermarkText(Aspose.Words.Document doc, string watermarkText)
{
    // Create a watermark shape. This will be a WordArt shape. 
    // You are free to try other shape types as watermarks.
    Shape watermark = new Shape(doc, ShapeType.TextPlainText);

    // Set up the text of the watermark.
    watermark.TextPath.Text = watermarkText;
    // watermark.TextPath.FontFamily = "Frutiger LT 45 Light";
    watermark.Width = 500;
    watermark.Height = 100;
    // Text will be directed from the bottom-left to the top-right corner.
    watermark.Rotation = -40;
    watermark.Fill.Color = Color.Gray; // Try LightGray to get more Word-style watermark
    watermark.StrokeColor = Color.Gray; // Try LightGray to get more Word-style watermark

    // Place the watermark in the page center.
    watermark.RelativeHorizontalPosition = RelativeHorizontalPosition.Page;
    watermark.RelativeVerticalPosition = RelativeVerticalPosition.Page;
    watermark.WrapType = WrapType.None;
    watermark.VerticalAlignment = VerticalAlignment.Center;
    watermark.HorizontalAlignment = HorizontalAlignment.Center;

    // Create a new paragraph and append the watermark to this paragraph.
    Paragraph watermarkPara = new Paragraph(doc);
    watermarkPara.AppendChild(watermark);

    // Insert the watermark into all headers of each document section.
    foreach (Section sect in doc.Sections)
    {
        // There could be up to three different headers in each section, since we want
        // the watermark to appear on all pages, insert into all headers.
        InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderPrimary);
        InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderFirst);
        // InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderEven);
    }

}

private static void InsertWatermarkIntoHeader(Paragraph watermarkPara, Section sect, HeaderFooterType headerType)
{
    HeaderFooter header = sect.HeadersFooters[headerType];

    if (header == null)
    {
        // There is no header of the specified type in the current section, create it.
        header = new HeaderFooter(sect.Document, headerType);
        sect.HeadersFooters.Add(header);
        header.AppendChild(watermarkPara.Clone(true));
    }

    // Insert a clone of the watermark into the header.
}

Hi there,

Thanks for your inquiry. Could you please attach your input Word document here for testing? I will investigate the issue on my side and provide you more information.

Hello
Thanks for the response.
I have attached the word document. “input.dot”

Hi there,

Thanks for sharing the document. Please use the header.AppendChild method outside the If block as shown in following highlighted code snippet. This will fix the issue which you are facing. Please let us know if you have any more queries.

private static void InsertWatermarkIntoHeader(Paragraph watermarkPara, Section sect, HeaderFooterType headerType)
{
    HeaderFooter header = sect.HeadersFooters[headerType];
    if (header == null)
    {
        // There is no header of the specified type in the current section, create it.
        header = new HeaderFooter(sect.Document, headerType);
        sect.HeadersFooters.Add(header);
    }
    // Insert a clone of the watermark into the header.
    header.AppendChild(watermarkPara.Clone(true));
}