c# - 如何生成 gridview 绑定(bind)条形码到 pdf？

Question

我有一个网格，它绑定(bind)了数据库中的一些条形码。我想以 pdf 格式生成此条形码。我怎样才能做到这一点？抱歉，我不知道如何执行此操作，因此没有可显示的示例代码。我的 GridView 名称“GrdBarcode”。请帮助我。下面是我的条形码网格

  <asp:GridView ID="grdBarcode" CssClass="table"   
 OnRowDataBound="grdBarcode_RowDataBound" AutoGenerateColumns="false" 
 GridLines="None" runat="server">
 <Columns>
 <asp:TemplateField>
<ItemTemplate>
 <table style="width:100%">
 <tr>
 <p>Date:<asp:Label runat="server" ID="Label5" Text='<%#Eval("Date") %>'>    
 </asp:Label>   </p></td>
 <td align="center"></td> <td><p>No Of QP: <asp:Label runat="server"   
 ID="Label6" Text='<%#Eval("NoOfQP") %>'></asp:Label></p>
 <p>Time: <asp:Label runat="server" ID="Label7" Text='<%#Eval("Timing") %>'>
 </asp:Label></p>
 <p>Durations: <asp:Label runat="server" ID="Label8"  
Text='<%#Eval("Duration") %>'></asp:Label>)</p>
</td>
</tr>
<tr>
<td colspan="3" align="center">
<asp:DataList ID="datalistBarcode"  RepeatColumns="3"  
RepeatDirection="Horizontal" GridLines="None" 
OnItemDataBound="datalistBarcode_ItemDataBound"  runat="server">
<ItemTemplate> <asp:Label ID="lblBarCode" runat="server"   
Text='<%#Eval("BarCode") %>' Visible="false"></asp:Label>
<table class="table">
<tr> <td >
<asp:Panel ID="pnlBarCode" HorizontalAlign="center"  runat="server">
</asp:Panel>
</tr>
<tr>
<td align="center"><asp:Label ID="lblStudCode" runat="server" 
Text='<%#Eval("StudCode") %>'></asp:Label>
</td>
</tr>
</table>
</ItemTemplate>
 </asp:DataList>
</td>
</tr>
 </table>
</ItemTemplate></asp:TemplateField>
</Columns>
</asp:GridView>      

我尝试了下面提到的方法。但它显示错误 Document has no pages

 protected void btnPrint_Click(object sender, EventArgs e)
    {
        foreach (GridViewRow row in grdBarcode.Rows)
        {
            DataList dl = (DataList)row.FindControl("datalistBarcode");
            string attachment = "attachment; filename=Article.pdf";
            Response.ClearContent();
            Response.AddHeader("content-disposition", attachment);
            Response.ContentType = "application/pdf";
            StringWriter stw = new StringWriter();
            HtmlTextWriter htextw = new HtmlTextWriter(stw);
            dl .DataBind();
            dl .RenderControl(htextw);
            Document document = new Document();
            PdfWriter.GetInstance(document, Response.OutputStream);
            document.Open();
            StringReader str = new StringReader(stw.ToString());
            HTMLWorker htmlworker = new HTMLWorker(document);
            htmlworker.Parse(str);
            document.Close();
            Response.Write(document);
            Response.End();
        }

Answer 1

当您需要网格时，最好使用PdfPTable。

如果您还没有条形码，您可以使用 iText 或 iTextSharp 创建它们。看看 Barcodes灵感示例:

public void createPdf(String dest) throws IOException, DocumentException {
    Document document = new Document();
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(dest));
    document.open();
    PdfPTable table = new PdfPTable(4);
    table.setWidthPercentage(100);
    for (int i = 0; i < 12; i++) {
        table.addCell(createBarcode(writer, String.format("%08d", i)));
    }
    document.add(table);
    document.close();
}

public static PdfPCell createBarcode(PdfWriter writer, String code) throws DocumentException, IOException {
    BarcodeEAN barcode = new BarcodeEAN();
    barcode.setCodeType(Barcode.EAN8);
    barcode.setCode(code);
    PdfPCell cell = new PdfPCell(barcode.createImageWithBarcode(writer.getDirectContent(), BaseColor.BLACK, BaseColor.GRAY), true);
    cell.setPadding(10);
    return cell;
}

有关创建条形码的一些 C# 代码，请参阅:

• Barcode with Text Under using ItextSharp
• Add itextsharp barcode image to PdfPCell
• generate barcode in pdf when using itextsharp to build the pdf
• ...

如果您已经有了带有条形码的图像，您仍然可以使用表格，但问题应该是我如何在表格中组织图像？

这在以下问题中得到了回答:

• How to add an image to a table cell in iTextSharp using webmatrix
• Image auto resizes in PdfPCell with iTextSharp
• itextsharp and images sizes
• Putting several images next to each other in a pdfcell with itextsharp
• iTextSharp: How to resize an image to fit a fix size?
• Image resizes when inserted in PdfCell
• ...