itextSharp 数据表到 pdf base64 字符串 - pdf 损坏

Question

我正在尝试从数据表中获取 pdf 并将其附加到 CRM 中的实体。为此，我使用此代码。不幸的是，创建的 pdf 已损坏，我无法打开它。有什么想法吗？

private static string ExportToBase64Pdf(DataTable dt, string entityName)
    {
        using (MemoryStream memoryStream = new MemoryStream())
        {
            Document document = new Document(PageSize.A4);
            PdfWriter writer = PdfWriter.GetInstance(document, memoryStream);
            document.Open();
            Font font5 = FontFactory.GetFont(FontFactory.HELVETICA, 5);

            PdfPTable table = new PdfPTable(dt.Columns.Count);
            float[] widths = new float[dt.Columns.Count];

            for (int i =0; i<dt.Columns.Count; i++) { widths[i] = 4f; }
            table.SetWidths(widths);
            table.WidthPercentage = 100;

            PdfPCell cell = new PdfPCell(new Phrase(entityName));

            cell.Colspan = dt.Columns.Count;

            foreach (DataColumn c in dt.Columns)
            {
                table.AddCell(new Phrase(c.ColumnName, font5));
            }

            foreach (DataRow r in dt.Rows)
            {
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    table.AddCell(new Phrase(r[i].ToString(), font5));
                }
            }
            document.Add(table);

            var bytes = memoryStream.ToArray();
            var encodedPDF = Convert.ToBase64String(bytes);

            document.Close();
            return encodedPDF;
        }
    }

Answer 1

您在文档结束之前检索了文档字节：

        var bytes = memoryStream.ToArray();
        var encodedPDF = Convert.ToBase64String(bytes);

        document.Close();

将关闭调用移到 ToArray 调用之前。

itextSharp 数据表到 pdf base64 字符串 - pdf 损坏

itextSharp datatable to pdf base64 string - pdf damaged

c#

pdf

base64