C# ItextSharp 尝试解析 html 以进行 pdf 转换时出错
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ItextSharp Error on trying to parse html for pdf conversion
提问by karry
I was using the ItextSharp module to convert the below listed html in to a pdf page.
我正在使用 ItextSharp 模块将下面列出的 html 转换为 pdf 页面。
<div style="font-size: 18pt; font-weight: bold;">
mma<br>mmar</div><br> <br>
<div style="font-size: 14pt;">Click to View Pricing
</div>
<br>
<div>
<table>
<tr><td> <a href="http://www.mma.com/fci" style="color: Blue; font-size: 10pt; text-decoration: underline;"> FCI</a>:</td>
<td><a href="http://www.mma.com/access/?pn=78211-014" style="color: Blue; font-size: 10pt; text-decoration: underline;"> 78211-014</a></td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-009"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-009</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-006"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-006</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-007"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-007</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-003"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-003</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-005"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-005</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-008"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-008</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-004"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-004</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-012"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-012</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-007LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-007LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-015LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-015LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-003LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-003LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-009LF"
style="color: Blue; font-size: 10pt; text-decoration:
underline;">78211-009LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-005LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-005LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-010LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-010LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-006LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-006LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-014LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-014LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-004LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-004LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-012LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-012LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-008LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-008LF</td></tr><tr><td></td> <td>
<a href="http://www.mma.com/access/?pn=78211-011LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-011LF</td></tr><tr><td></td> <td><a href="http://www.mma.com/access/?pn=78211-013LF"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-013LF</td></tr><tr><td></td> <td><a href="http://www.mma.com/access/?pn=78211-010" style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-010</td></tr><tr><td></td>
<td><a href="http://www.mma.com/access/?pn=78211-015"
style="color: Blue; font-size: 10pt; text-decoration: underline;">78211-015</td></tr><tr><td>
<a href="http://www.mma.com/souriau"
style="color: Blue; font-size: 10pt; text-decoration: underline;"> Souriau</a>:</td>
<td><a href="http://www.mma.com/access/?pn=24JR124-3" style="color: Blue; font-size: 10pt; text-decoration: underline;"> 24JR124-3</a></td></tr></table></div>
C# code to generate the html above :
生成上面的html的C#代码：
var html = new StringBuilder(@"<div style=""font-size: 18pt; font-weight: bold;"">Authorized Distributor</div><br> <br><div style=""font-size: 14pt;"">Click to View Pricing, Inventory, Delivery & Lifecycle Information:</div><br>");
List<MfrBrandView> mfrBrands = MfrBrandView.Load(fileId);
var uniquesuppliers = mfrBrands.GroupBy(t => new {t.Manufacturer,t.SupplierVirtualDirectory}).Select(g => g.First());
html.Append("<div><table>");
foreach (var uniquesupplier in uniquesuppliers)
{
var mfrPartNums =
mfrBrands.Where(t => t.ManufacturerId == uniquesupplier.ManufacturerId).Select(
t => t.ManufacturerPartNumber).ToList();
html.AppendFormat(@"<tr><td> <a href=""http://www.mma.com/{0}"" style=""color: Blue; font-size: 10pt; text-decoration: underline;""> {1}</a>:</td> <td><a href=""http://www.mma.com/access/?pn={2}"" style=""color: Blue; font-size: 10pt; text-decoration: underline;""> {2}</a></td></tr>", uniquesupplier.SupplierVirtualDirectory, uniquesupplier.MouserizationLabel, mfrPartNums[0]);
for (int i = 1; i < mfrPartNums.Count(); i++)
{
html.AppendFormat(
@"<tr><td></td> <td><a href=""http://www.mma.com/access/?pn={0}"" style=""color: Blue; font-size: 10pt; text-decoration: underline;"">{0}</td></tr>",
mfrPartNums[i]);
}
}
html.Append("</table></div>");
return html.ToString();
Code to generate the page after html is formed:
html形成后生成页面的代码：
PdfWriter writer = null;
PdfDocument doc = null;
//PdfReader reader = new PdfReader(content);
// reader.Info["Title"]
try
{
doc = new PdfDocument();
doc.SetPageSize(PageSize.LETTER);
writer = PdfWriter.GetInstance(doc, content);
writer.CloseStream = false;
doc.Open();
doc.NewPage();
foreach (IElement element in iTextSharp.text.html.simpleparser.HTMLWorker.ParseToList(new StringReader(html), null))
{
doc.Add(element);
}
}
below is where i get an exception saying "Unable to cast object of type'iTextSharp.text.html.simpleparser.CellWrapper' to type 'iTextSharp.text.Paragraph'."
iTextSharp.text.html.simpleparser.HTMLWorker.ParseToList(new StringReader(html), null)
下面是我收到一个异常说“无法将类型为'iTextSharp.text.html.simpleparser.CellWrapper' 的对象转换为类型'iTextSharp.text.Paragraph' 的地方。
iTextSharp.text.html.simpleparser.HTMLWorker.ParseToList(new StringReader(html), null)
Is there something wrong with the html I'm trying to parse? Is there a better way of doing this? Thanks much in advance for your help. It's very much appreciated.
我试图解析的 html 有什么问题吗？有没有更好的方法来做到这一点？非常感谢您的帮助。非常感谢。
采纳答案by kuujinbo
`HTMLWorker' has been deprecatedin favor of XMLWorker. Here is a working example tested with a snippet of HTML like you used above:
`HTMLWorker'已被弃用，取而代之的是XMLWorker。这是一个使用上面使用的 HTML 片段测试的工作示例：
StringReader html = new StringReader(@"
<div style='font-size: 18pt; font-weight: bold;'>
Mouser Electronics <br />Authorized Distributor</div><br /> <br />
<div style='font-size: 14pt;'>Click to View Pricing, Inventory, Delivery & Lifecycle Information:
</div>
<br />
<div>
<table>
<tr><td></td><td>
<a href='http://www.mouser.com/access/?pn=78211-009'
style='color: Blue; font-size: 10pt; text-decoration: underline;'>78211-009</a></td></tr>
</table></div>
");
using (Document document = new Document()) {
PdfWriter writer = PdfWriter.GetInstance(document, STREAM);
document.Open();
XMLWorkerHelper.GetInstance().ParseXHtml(
writer, document, html
);
}
When using XMLWorkeryou need to use well-formed HTML - it's an XML parser, after all. The sample HTMLfrom your question above doesn't have closing <a>or <br>tags. A HTMLparser like HtmlAgilityPackwill fix those problems, and turn this:
使用时，XMLWorker您需要使用格式良好的 HTML - 毕竟它是一个 XML 解析器。HTML您上面问题中的示例没有结束语<a>或<br>标签。HTML像HtmlAgilityPack这样的解析器 将解决这些问题，并把它变成：
<div><img src='a.gif'><br><hr></div>
into this:
进入这个：
<div><img src='a.gif' /><br /><hr /></div>
with only a few lines of code:
只需几行代码：
var hDocument = new HtmlDocument()
{
OptionWriteEmptyNodes = true,
OptionAutoCloseOnEnd = true
};
hDocument.LoadHtml("<div><img src='a.gif'><br><hr></div>");
var closedTags = hDocument.DocumentNode.WriteTo();
XMLWorkeris available as a nuget package, or as a separate download at sourceforge.
XMLWorker是可作为NuGet包，或作为在SourceForge单独下载。
See here for more advanced usageof XMLWorker.
见这里更高级的用法的XMLWorker。
回答by PQubeTechnologies
Try the following code
试试下面的代码
<a href="http://www.abcd.com"></a>
Here we are replacing < with < and > with > so my becomes <a>and becomes </a>.
在这里，我们将 < 替换为< 和 > 与> 所以我的成为<a>和成为 </a>。
回答by saktiprasad swain
Here are the step what you need to do
这是您需要执行的步骤
1- Install itext sharp and XMLWorker from Itextsharp from nuget
1-从 nuget 安装 itextsharp 和 XMLWorker
2-Then put ur design in html(here Invoice.html) with inline CSS
2-然后将您的设计放入带有内联 CSS 的 html（此处为 Invoice.html）中
3-Make sure all tag are ended properly like breakpoint or td(here I got error earlier)
3-确保所有标签都像断点或 td 一样正确结束（这里我之前有错误）
4-here image wouldn't show locally so without wasting time I uploaded image in server and gave server Path to access Image.U can research more to run it locally.
4-here 图像不会在本地显示，所以不浪费时间我将图像上传到服务器并提供服务器路径以访问 Image.U 可以研究更多以在本地运行它。
Document doc = new Document();
PdfPTable tableLayout = new PdfPTable(4);
PdfWriter writer= PdfWriter.GetInstance(doc, new FileStream(Server.MapPath("~/Admin/T13.pdf"), FileMode.Create));
doc.Open();
string contents = File.ReadAllText(Server.MapPath("~/Admin/invoice.html"));
StringReader sr = new StringReader(contents);
XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, sr);
doc.Close();
