c# openxml 添加图片居中

以下是使用C# Open XML添加图片并居中的示例代码：

using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using A = DocumentFormat.OpenXml.Drawing;
using DW = DocumentFormat.OpenXml.Drawing.Wordprocessing;
using PIC = DocumentFormat.OpenXml.Drawing.Pictures;

public void AddCenteredImage(string imagePath, string documentPath)
{
    using (WordprocessingDocument document = WordprocessingDocument.Open(documentPath, true))
    {
        MainDocumentPart mainPart = document.MainDocumentPart;

        // 创建一个段落
        Paragraph paragraph = new Paragraph();

        // 创建一个段落属性
        ParagraphProperties paragraphProperties = new ParagraphProperties();
        Justification justification = new Justification() { Val = JustificationValues.Center };

        // 将段落属性添加到段落
        paragraphProperties.Append(justification);
        paragraph.Append(paragraphProperties);

        // 创建一个Run
        Run run = new Run();

        // 创建一个Drawing
        Drawing drawing = new Drawing();

        // 创建一个Inline
        Inline inline = new Inline();

        // 创建一个Graphic
        Graphic graphic = new Graphic();

        // 创建一个GraphicData
        GraphicData graphicData = new GraphicData() { Uri = "http://schemas.openxmlformats.org/drawingml/2006/picture" };

        // 创建一个Picture
        PIC.Picture picture = new PIC.Picture();

        // 创建一个BlipFill
        PIC.BlipFill blipFill = new PIC.BlipFill();

        // 创建一个Blip
        A.Blip blip = new A.Blip() { Embed = mainPart.GetIdOfPart(mainPart.AddImagePart(ImagePartType.Jpeg)) };

        // 创建一个Stretch
        A.Stretch stretch = new A.Stretch();
        A.FillRectangle fillRectangle = new A.FillRectangle();

        // 将Blip添加到BlipFill
        blipFill.Append(blip);
        blipFill.Append(stretch);

        // 将BlipFill添加到Picture
        picture.Append(blipFill);
        picture.Append(fillRectangle);

        // 创建一个ShapeProperties
        PIC.ShapeProperties shapeProperties = new PIC.ShapeProperties();

        // 创建一个Transform2D
        A.Transform2D transform2D = new A.Transform2D();

        // 创建一个Offset
        A.Offset offset = new A.Offset() { X = 0, Y = 0 };

        // 创建一个Extent
        A.Extents extents = new A.Extents() { Cx = 914400, Cy = 914400 };

        // 将Offset和Extent添加到Transform2D
        transform2D.Append(offset);
        transform2D.Append(extents);

        // 将Transform2D添加到ShapeProperties
        shapeProperties.Append(transform2D);

        // 将ShapeProperties添加到Picture
        picture.Append(shapeProperties);

        // 将Picture添加到GraphicData
        graphicData.Append(picture);

        // 将GraphicData添加到Graphic
        graphic.Append(graphicData);

        // 将Graphic添加到Inline
        inline.Append(graphic);

        // 将Inline添加到Drawing
        drawing.Append(inline);

        // 将Drawing添加到Run
        run.Append(drawing);

        // 将Run添加到段落
        paragraph.Append(run);

        // 将段落添加到文档主体
        mainPart.Document.Body.Append(paragraph);

        // 保存文档
        mainPart.Document.Save();
    }
}

请注意，您需要将`imagePath`替换为您要添加的图片的路径，将`documentPath`替换为您要保存的Word文档的路径。