如何在C＃中使用itextsharp將字符串（包含html標記）轉換為通過短語的PDF格式？

Question

我的輸出是這樣的

我想要這樣的輸出

我正在生成一個pdf文件。 我正在傳遞包含html標記的字符串。 但是將pdf中的字符串綁定作為html標簽。 但是我需要將輸出作為設計在html標簽中的內容。 我正在將字符串注釋傳遞給短語ph14 ...

public string GenerateQuotePdf(int id)
{
    Stream stream = Stream.Null;
    Document pdfDoc = new Document(PageSize.A4, 30F, 30F, 20F, 0F);
    try
        {
            stream = new FileStream(filePath, FileMode.Create);
            PdfWriter pdfWriter = PdfWriter.GetInstance(pdfDoc, stream);
            pdfDoc.Open();

            string notes ="<div style=\"text-align: center\"><b><span style=\"font-size: large\">Terms and Conditions</span></b></div><div>*<span class=\"Apple-tab-span\" style=\"white-space: pre\">\t</span>Prices are in AED</div><div><br /></div><div>*<span class=\"Apple-tab-span\" style=\"white-space: pre\">\t</span>All Credit Card transactions are subject to a 3.25% processing fee</div><div><br /></div><div>*<span class=\"Apple-tab-span\" style=\"white-space: pre\">\t</span>In the event production is required per customer request, 50% of the entire bill will be due prior to start of production, and the <span class=\"Apple-tab-span\" style=\"white-space: pre\">\t</span>balance due upon delivery.</div><div><br /></div><div>*<span class=\"Apple-tab-span\" style=\"white-space: pre\">\t</span>All furniture will be delivered in A+ condition. In the event that the equipment is damaged, the renter shall be liable for all <span class=\"Apple-tab-span\" style=\"white-space: pre\">\t</span>repair costs to restore the equipment to its state at the beginning of the rental period.</div><div><br /></div><div>*<span class=\"Apple-tab-span\" style=\"white-space: pre\">\t</span>Equipment shall be utilized for the stated purpose and at the stated location only.</div>";

            PdfPTable table14 = new PdfPTable(1);
            table14.WidthPercentage = 99;
            table14.DefaultCell.Border = 0;
            table14.DefaultCell.VerticalAlignment = Element.ALIGN_MIDDLE;
            Phrase ph14 = new Phrase(notes, textFont6);
            PdfPCell cell14 = new PdfPCell(ph14);
            cell14.VerticalAlignment = Element.ALIGN_CENTER;
            cell14.Border = 0;
            cell14.HorizontalAlignment = Element.ALIGN_CENTER;
            cell14.PaddingLeft = 10F;
            cell14.PaddingRight = 4F;
            cell14.PaddingTop = 4F;
            cell14.PaddingBottom = 6F;
            table14.AddCell(cell14);

            PdfPTable mainTable = new PdfPTable(1);
            mainTable.WidthPercentage = 100;
            PdfPCell mainCell = new PdfPCell();
            mainCell.PaddingTop = 0F;
            mainCell.PaddingRight = 10F;
            mainCell.PaddingBottom = 25F;
            mainCell.PaddingLeft = 10F;
            mainCell.Border = 0;
            mainCell.AddElement(table14);
            mainTable.AddCell(mainCell);
            pdfDoc.Add(mainTable);
        }
        catch
        {
        }
        finally
        {
            pdfDoc.Close();
            stream.Close();
            stream.Dispose();
        }
    }

Answer 1

我已將您的HTML復制到名為list_dirty.html的文件中：

<div style="text-align: center"><b><span style="font-size: large">Terms and Conditions</span></b></div>
<div>*<span class="Apple-tab-span" style="white-space: pre"> </span>Prices are in AED</div>
<div><br /></div>
<div>*<span class="Apple-tab-span" style="white-space: pre"> </span>All Credit Card transactions are subject to a 3.25% processing fee</div>
<div><br /></div>
<div>*<span class="Apple-tab-span" style="white-space: pre"> </span>In the event production is required per customer request, 50% of the entire bill will be due prior to start of production, and the <span class="Apple-tab-span" style="white-space: pre"> </span>balance due upon delivery.</div>
<div><br /></div>
<div>*<span class="Apple-tab-span" style="white-space: pre"> </span>All furniture will be delivered in A+ condition. In the event that the equipment is damaged, the renter shall be liable for all <span class="Apple-tab-span" style="white-space: pre"> </span>repair costs to restore the equipment to its state at the beginning of the rental period.</div>
<div><br /></div>
<div>*<span class="Apple-tab-span" style="white-space: pre"> </span>Equipment shall be utilized for the stated purpose and at the stated location only.</div>

該HTML被認為是“臟”的，因為您要呈現一個列表，但是您沒有使用正確的標簽來這樣做。

我已經使用List_Dirty示例將此HTML解析為PDF：

public void createPdf(String file) throws IOException, DocumentException {
    // step 1
    Document document = new Document();
    // step 2
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));
    writer.setInitialLeading(12);
    // step 3
    document.open();
    // step 4
    XMLWorkerHelper.getInstance().parseXHtml(writer, document,
            new FileInputStream(HTML));
    // step 5
    document.close();
}

結果是一個如下所示的PDF：

如果您尊重自己作為開發人員的能力（我假設您是這樣做的），那么您對這個結果將不滿意：列表不是真實的列表。 您可以像在文件list_clean.html中所做的那樣，通過使其成為真實列表來解決此問題 ：

<div style="text-align: center"><b><span style="font-size: large">Terms and Conditions</span></b></div>
<ul>
<li>Prices are in AED</li>
<li>All Credit Card transactions are subject to a 3.25% processing fee</li>
<li>In the event production is required per customer request, 50% of the entire bill will be due prior to start of production, and the balance due upon delivery.</li>
<li>All furniture will be delivered in A+ condition. In the event that the equipment is damaged, the renter shall be liable for all repair costs to restore the equipment to its state at the beginning of the rental period.</li>
<li>Equipment shall be utilized for the stated purpose and at the stated location only.</li>
</ul>

我已經使用List_Clean示例將此HTML解析為PDF：

public void createPdf(String file) throws IOException, DocumentException {
    // step 1
    Document document = new Document();
    // step 2
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));
    writer.setInitialLeading(12);
    // step 3
    document.open();
    // step 4
    XMLWorkerHelper.getInstance().parseXHtml(writer, document,
            new FileInputStream(HTML)); 
    // some code that will be explained later
    // step 5
    document.close();
}

此代碼與我們之前的代碼有何不同？ 沒有！ 只有HTML與眾不同，導致PDF看起來像這樣：

那已經更好了，但是在您的代碼中，您有更多的間距，並且還將列表添加到PdfPTable 。 這就是為什么我在List_Clean示例中第二次添加相同的HTML：

String html = Utilities.readFileToString(HTML);
String css = "ul { list-style: disc } li { padding: 10px }";
PdfPTable table = new PdfPTable(1);
table.setSpacingBefore(20);
PdfPCell cell = new PdfPCell();
for (Element e : XMLWorkerHelper.parseToElementList(html, css)) {
    cell.addElement(e);
}
table.addCell(cell);
document.add(table);

你看得到差別嗎？ 我正在使用CSS定義列表符號，並且為每個列表項定義了填充。 我沒有直接將HTML呈現給Document和PdfWriter ，而是將HTML和CSS解析為元素列表。 然后，我將每個元素添加到PdfPCell 。

結果看起來像這樣：

這看起來很不錯，不是嗎？ 有關使用iText（Sharp）和XML Worker的更多信息，請查看官方文檔 ： XML Worker示例 / XML Worker FAQ

Answer 2

通常，我使用此方法將HTML標簽手動轉換為純文本

public static string ConvertHtmlToPlainText(string text)
{
text = HttpUtility.HtmlDecode(text);

text = text.Replace("<br>", "\n");
text = text.Replace("<br >", "\n");
text = text.Replace("<br />", "\n");
text = text.Replace("&nbsp;&nbsp;", "\t");


text = text.Replace("&nbsp;&nbsp;", "  ");

text = ReplaceAnchorTags(text);

return text;
}