NPOI.XSSF.UserModel.XSSFWorkbook.AddPicture C# (CSharp) Method

        public int AddPicture(Stream picStream, int format)
        {
            int imageNumber = GetAllPictures().Count + 1;
            XSSFPictureData img = (XSSFPictureData)CreateRelationship(XSSFPictureData.RELATIONS[format], XSSFFactory.GetInstance(), imageNumber, true);
            Stream out1 = img.GetPackagePart().GetOutputStream();
            IOUtils.Copy(picStream, out1);
            out1.Close();
            pictures.Add(img);
            return imageNumber - 1;
        }

        public void TestNew()
        {
            XSSFWorkbook wb      = new XSSFWorkbook();
            XSSFSheet    sheet   = (XSSFSheet)wb.CreateSheet();
            XSSFDrawing  Drawing = (XSSFDrawing)sheet.CreateDrawingPatriarch();

            byte[] jpegData = Encoding.UTF8.GetBytes("test jpeg data");
            byte[] wmfData  = Encoding.UTF8.GetBytes("test wmf data");
            byte[] pngData  = Encoding.UTF8.GetBytes("test png data");

            IList pictures = wb.GetAllPictures();

            Assert.AreEqual(0, pictures.Count);

            int jpegIdx = wb.AddPicture(jpegData, PictureType.JPEG);

            Assert.AreEqual(1, pictures.Count);
            Assert.AreEqual("jpeg", ((XSSFPictureData)pictures[jpegIdx]).SuggestFileExtension());
            Assert.IsTrue(Arrays.Equals(jpegData, ((XSSFPictureData)pictures[jpegIdx]).Data));

            int wmfIdx = wb.AddPicture(wmfData, PictureType.WMF);

            Assert.AreEqual(2, pictures.Count);
            Assert.AreEqual("wmf", ((XSSFPictureData)pictures[wmfIdx]).SuggestFileExtension());
            Assert.IsTrue(Arrays.Equals(wmfData, ((XSSFPictureData)pictures[wmfIdx]).Data));

            int pngIdx = wb.AddPicture(pngData, PictureType.PNG);

            Assert.AreEqual(3, pictures.Count);
            Assert.AreEqual("png", ((XSSFPictureData)pictures[pngIdx]).SuggestFileExtension());
            Assert.IsTrue(Arrays.Equals(pngData, ((XSSFPictureData)pictures[pngIdx]).Data));

            //TODO finish usermodel API for XSSFPicture
            XSSFPicture p1 = (XSSFPicture)Drawing.CreatePicture(new XSSFClientAnchor(), jpegIdx);

            Assert.IsNotNull(p1);
            XSSFPicture p2 = (XSSFPicture)Drawing.CreatePicture(new XSSFClientAnchor(), wmfIdx);

            Assert.IsNotNull(p1);
            XSSFPicture p3 = (XSSFPicture)Drawing.CreatePicture(new XSSFClientAnchor(), pngIdx);

            Assert.IsNotNull(p1);

            //check that the Added pictures are accessible After write
            wb = (XSSFWorkbook)XSSFTestDataSamples.WriteOutAndReadBack(wb);
            IList pictures2 = wb.GetAllPictures();

            Assert.AreEqual(3, pictures2.Count);

            Assert.AreEqual("jpeg", ((XSSFPictureData)pictures2[jpegIdx]).SuggestFileExtension());
            Assert.IsTrue(Arrays.Equals(jpegData, ((XSSFPictureData)pictures2[jpegIdx]).Data));

            Assert.AreEqual("wmf", ((XSSFPictureData)pictures2[wmfIdx]).SuggestFileExtension());
            Assert.IsTrue(Arrays.Equals(wmfData, ((XSSFPictureData)pictures2[wmfIdx]).Data));

            Assert.AreEqual("png", ((XSSFPictureData)pictures2[pngIdx]).SuggestFileExtension());
            Assert.IsTrue(Arrays.Equals(pngData, ((XSSFPictureData)pictures2[pngIdx]).Data));
        }