MS Word、OpenXML、页面设置、方向和4_方向边距

你需要使用 SectionProperties , PageSize 和 PageMargin

using (WordprocessingDocument wd = WordprocessingDocument.Create(filename, WordprocessingDocumentType.Document))
{
    MainDocumentPart m = wd.AddMainDocumentPart();
    m.Document = new Document();
    Body b1 = new Body();

    //new code to support orientation and margins
    SectionProperties sectProp = new SectionProperties();
    PageSize pageSize = new PageSize() { Width = 16838U, Height = 11906U, Orient = PageOrientationValues.Landscape };
    PageMargin pageMargin = new PageMargin() { Top = 720, Right = 720U, Bottom = 720, Left = 720U };

    sectProp.Append(pageSize);
    sectProp.Append(pageMargin);
    b1.Append(sectProp);
    //end new code

    int myCount = 5;
    for (int z = 1; z <= myCount; z++)
    {
        Paragraph p1 = new Paragraph();
        Run r1 = new Run();
        Text t1 = new Text(
            "The Quick Brown Fox Jumps Over The Lazy Dog  " + z);
        r1.Append(t1);
        p1.Append(r1);
        b1.Append(p1);
    }
    m.Document.Append(b1);
}