ItextSharp嘗試解析html進行pdf轉換時出錯

c# html-agility-pack html-parsing itext xmlworker

我使用ItextSharp模塊將下面列出的html轉換為pdf頁面。

        <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#代碼生成上面的html:

 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();

形成html後生成頁面的代碼:

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);
                }
            }

下面是我得到一個例外,說“無法將 'iTextSharp.text.html.simpleparser.CellWrapper'類型的 對象轉換為 'iTextSharp.text.Paragraph' 。” iTextSharp.text.html.simpleparser.HTMLWorker.ParseToList(new StringReader(html), null)

我試圖解析的HTML有什麼問題嗎?有更好的方法嗎?非常感謝您的幫助。非常感謝。

一般承認的答案

“HTMLWorker” 已被棄用 ,轉而使用XMLWorker 。這是一個使用上面使用的HTML片段測試的工作示例:

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
  );
}

使用XMLWorker您需要使用格式良好的HTML - 畢竟它是一個XML解析器。上述問題中的示例HTML沒有關閉<a><br>標籤。像HtmlAgilityPack這樣的HTML解析器將解決這些問題,並將其轉為:

<div><img src='a.gif'><br><hr></div>

進入這個:

<div><img src='a.gif' /><br /><hr /></div>

只需幾行代碼:

var hDocument = new HtmlDocument()
{
    OptionWriteEmptyNodes = true,
    OptionAutoCloseOnEnd = true
};
hDocument.LoadHtml("<div><img src='a.gif'><br><hr></div>");
var closedTags  = hDocument.DocumentNode.WriteTo();

XMLWorker 可作為nuget包提供 ,也可以在sourceforge單獨下載

有關XMLWorker 更高級用法 ,請參見此處


熱門答案

以下是您需要做的步驟

1-從nuget安裝來自Itextsharp的itext sharp和XMLWorker

2 - 然後將你的設計放在帶有內聯CSS的html(這裡是Invoice.html)中

3 - 確保所有標記都像斷點或td一樣正確結束(這裡我之前收到錯誤)

4-here圖像不會在本地顯示,所以不浪費時間我在服務器上傳圖像並給服務器Path訪問Image.U可以研究更多在本地運行它。

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();



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許可下: CC-BY-SA with attribution
不隸屬於 Stack Overflow
這個KB合法嗎? 是的,了解原因