Replacing a Picture in a Picture Content Control in an Open XML WordprocessingML Document

You may have a picture content control where you want to replace the picture with a different picture. This post shows the Open XML SDK V2 code that is necessary to find a picture content control with an alias of “MyPicture”. It then finds the ImagePart, and then replaces the contents of the image part with a different image.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using DocumentFormat.OpenXml.Drawing;
class Program
{
    static void Main(string[] args)
    {
        using (WordprocessingDocument doc =
            WordprocessingDocument.Open("Test1.docx", true))
        {
            SdtBlock cc = doc.MainDocumentPart.Document.Body.Descendants<SdtBlock>()
                .FirstOrDefault(c =>
                {
                    SdtProperties p = c.Elements<SdtProperties>().FirstOrDefault();
                    if (p != null)
                    {
                        // Is it a picture content control?
                        SdtContentPicture pict =
                            p.Elements<SdtContentPicture>().FirstOrDefault();
                        // Get the alias.
                        SdtAlias a = p.Elements<SdtAlias>().FirstOrDefault();
                        if (pict != null && a.Val == "MyPicture")
                            return true;
                    }
                    return false;
                });
            string embed = null;
            if (cc != null)
            {
                Drawing dr = cc.Descendants<Drawing>().FirstOrDefault();
                if (dr != null)
                {
                    Blip blip = dr.Descendants<Blip>().FirstOrDefault();
                    if (blip != null)
                        embed = blip.Embed;
                }
            }
            if (embed != null)
            {
                IdPartPair idpp = doc.MainDocumentPart.Parts
                    .Where(pa => pa.RelationshipId == embed).FirstOrDefault();
                if (idpp != null)
                {
                    ImagePart ip = (ImagePart)idpp.OpenXmlPart;
                    using (FileStream fileStream =
                        File.Open("After.jpg", FileMode.Open))
                        ip.FeedData(fileStream);
                    Console.WriteLine("done");
                }
            }
        }
    }
}