如何生成 gridview 绑定条形码到 pdf？

Question

我有一个网格，它绑定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。我的网格视图名称 "GrdBarcode"。请帮助 me.Below 是我的带有条形码的网格

  <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>

我试过像下面提到的那样 methode.but 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

根据数据库中的数据类型，有两种方法可以做到这一点。

如果您将其存储为字符串：

Create your Crystal Report

Drag the binded field onto the report

change the field font to the barcode font you have (usually shipped with wand reader)

Export the report to PDF

如果您将其存储为图像：

Create your crystal report

Grab the image data from database as Image object

put the Image object into a MemoryStream

convert the MemoryStream to Byte[]

add a column to your crystal report data to be of type Byte[]

store the value into this column

Drag the new data field onto the report and it will be an image

Export the report to PDF

Answer 2

当你需要网格时，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。查看 Barcodes 示例以获得灵感：

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 table，但问题应该是 如何在 table 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
...

如何生成 gridview 绑定条形码到 pdf？

How to generate gridview binded barcode to pdf?

c#

itextsharp