我正在使用itextsharp将HTML转换为PDF，我改进了itextsharp方面的代码，遵循此线程iTextSharp XMLWorker parsing really slow 但现在我需要改进html。我的目标是达到最低0.1秒的时间，我现在得到0.4秒
我不知道html端的规则是什么，以便在itextsharp中进行最佳渲染。在我的HTML模板中基本上我有样式内联html，所有都是用表格完成的，这里我给你代码
<html>
<head>
<title>DOCUMENT</title>
</head>
<body>
<!-- 2 -->
<table width="100%" cellspacing="0px" cellpadding="0px">
<tr>
<!-- DETALLE DE LECTURA/CONSUMO OK-->
<td width="60%" style="padding-right:5px" valign="top">
<table width="100%" style="font-size:8pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td width="100%" style="border:1px solid #2F3640;background-color:#2F3640;color:#FFFFFF;font-weight:bold;padding: 2px 5px;font-size:10pt;">DETALLE DE LECTURA/CONSUMO</td>
</tr>
<tr>
<td>
<table width="100%" style="font-size:8pt;text-align:center" cellspacing="0px" cellpadding="0px" border="0">
<tr>
<td>Consumo Últimos 13 Meses (KWHs)</td>
</tr>
<tr>
<td width="100%">
<!-- GRAFICO DE CONSUMO -->
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<!--BARRAS-->
<tr>
<td width="100%">
<table width="100%" style="" cellspacing="0" cellpadding="0" align="left">
<tr style="font-size:5pt;height:130px;">
<!-- -->
<td style="font-size:5pt;width:4%"></td>
<!-- MES 1 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-1]</p>
<div style="width:100%; height:[valor-grafico-1-px]px; background-color:black">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 2 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-2]</p>
<div style="width:100%; height:[valor-grafico-2-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 3 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-3]</p>
<div style="width:100%; height:[valor-grafico-3-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 4 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-4]</p>
<div style="width:100%; height:[valor-grafico-4-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 5 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-5]</p>
<div style="width:100%; height:[valor-grafico-5-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 6 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-6]</p>
<div style="width:100%; height:[valor-grafico-6-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 7 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-7]</p>
<div style="width:100%; height:[valor-grafico-7-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 8 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-8]</p>
<div style="width:100%; height:[valor-grafico-8-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 9 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-9]</p>
<div style="width:100%; height:[valor-grafico-9-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 10 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-10]</p>
<div style="width:100%; height:[valor-grafico-10-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 11 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-11]</p>
<div style="width:100%; height:[valor-grafico-11-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 12 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-12]</p>
<div style="width:100%; height:[valor-grafico-12-px]px; background-color:gray">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:2%"></td>
<!-- MES 13 -->
<td valign="bottom" style="font-size:5pt;width:5%">
<p valign="center" style="width:100%; height:8px;">[valor-grafico-13]</p>
<div style="width:100%; height:[valor-grafico-13-px]px; background-color:black">
</div>
</td>
<!-- -->
<td style="font-size:5pt;width:4%"></td>
</tr>
</table>
</td>
</tr>
<!-- EJE -->
<tr style="background-color:black; padding: 0; height: 1px">
<td colspan="26" nowrap="" >
<div></div>
</td>
</tr>
<!-- MESES -->
<tr>
<td width="100%">
<table width="100%" cellspacing="0" cellpadding="0">
<tr>
<td style="font-size:5pt;" width="4%"></td>
<td style="font-size:5pt;" width="5%">[mes-1]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-2]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-3]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-4]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-5]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-6]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-7]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-8]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-9]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-10]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-11]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-12]</td>
<td style="font-size:5pt;" width="2%"></td>
<td style="font-size:5pt;" width="5%">[mes-13]</td>
<td style="font-size:5pt;" width="4%"></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="100%" style="font-size:8pt;">
<table width="100%" style="font-size:8pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td width="50%">Datos consumo desde: [fecha-inicio-consumo]</td>
<td width="50%">hasta: [fecha-hasta-consumo]</td>
</tr>
<tr>
<td colspan="2" >
<table width="100%" style="font-size:10pt;text-align:center;" cellspacing="0px" cellpadding="0px">
<tr>
<th>Medidores</th>
<th>Lectura Actual</th>
<th>Lectura Anterior</th>
<th>Diferencia</th>
<th>Constante</th>
<th>KWH</th>
</tr>
<tr>
<td>[medidor-1]</td>
<td>[lectura-actual-1]</td>
<td>[lectura-anterior-1]</td>
<td>[diferencia-1]</td>
<td>[constante-1]</td>
<td>[kwh-1]</td>
</tr>
<tr>
<td>[XX]</td>
<td>[XX]</td>
<td>[XX]</td>
<td>[XX]</td>
<td>[XX]</td>
<td>[XX]</td>
</tr>
<tr>
<td>[XX]</td>
<td>[XX]</td>
<td>[XX]</td>
<td>[XX]</td>
<td>[XX]</td>
<td>[XX]</td>
</tr>
</table>
</td>
</tr>
<tr>
<td style="padding-top:5px" colspan="2">
<table width="100%" style="font-size:8pt;text-align:right" cellspacing="0px" cellpadding="0px">
<tr>
<td width="80%" style="font-size:10pt;">Consumo Energia(KWH/mensual)</td>
<td width="20%" style="font-size:10pt;">[consumo-energia]</td>
</tr>
<tr>
<td width="80%" style="font-size:10pt;">Consumo Energia Invierno(KWH/mensual)</td>
<td width="20%" ="font-size:10pt;">[consumo-energia-invierno]</td>
</tr>
<tr>
<td width="80%">Potencia Contratada o Leída (KW)</td>
<td>[potencia-contratada]</td>
</tr>
<tr>
<td width="80%">Potencia Contratada o Leída Horas de Punta(KW)</td>
<td>[potencia-hora-punta]</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<td width="40%">
<table width="100%" style="font-size:8pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td align="center">
<img width="180px" src="http://localhost/FE.images/SEC.jpg" alt="sec"/>
</td>
</tr>
<tr>
<td>
<!-- ACUSE DE RECIBO -->
<table width="100%" style="font-size:8pt;">
<tr>
<td width="40%">Recinto:</td>
<td width="60%" style="border-bottom:1px solid black;"></td>
</tr>
<tr>
<td>Nombre:</td>
<td width="60%" style="border-bottom:1px solid black;"></td>
</tr>
<tr>
<td>Fecha:</td>
<td width="60%" style="border-bottom:1px solid black;"></td>
</tr>
<tr>
<td>RUT:</td>
<td width="60%" style="border-bottom:1px solid black;"></td>
</tr>
<tr>
<td colspan="2" style="border-bottom:1px solid black;">
<br/>
</td>
</tr>
<tr>
<td colspan="2" style="text-align:center">FIRMA</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- 3 -->
<table width="100%" style="font-size:8pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td width="65%">
<table width="100%" style="padding-right:5px; font-size:8pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td style="border:1px solid #2F3640;background-color:#2F3640;color:#FFFFFF;font-weight:bold;padding: 2px 5px;font-size:10pt;">
DETALLE DE LA CUENTA FACTURACION
</td>
</tr>
<tr>
<td>
<table width="100%" style="font-size:8pt;line-height:9pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td width="70%" style="font-size:10pt;" >Cargo fijo mensual</td>
<td width="30%" style="text-align:right;font-size:10pt;">$[cargo-fijo-mensual]</td>
</tr>
<tr>
<td style="font-size:10pt;">Cargo único del sistema troncal ([cantidad-energia] kWh)</td>
<td style="text-align:right;font-size:10pt;">$[cargo-unico]</td>
</tr>
<tr>
<td style="font-size:10pt;">Cargo por energía base ([cantidad-energia] kWh)</td>
<td style="text-align:right;font-size:10pt;">$[cargo-energia-base]</td>
</tr>
<tr>
<td style="font-size:10pt;">Cargo por energía adicional de invierno ([cantidad-energia] kWh)</td>
<td style="text-align:right;font-size:10pt;">$[cargo-energia-invierno]</td>
</tr>
<tr>
<td style="border-top:1px solid black;font-size:10pt;" width="70%">Reliquidaciones</td>
<td style="border-top:1px solid black;text-align:right;font-size:10pt;" width="30%">$[reliquidaciones]</td>
</tr>
<tr>
<td style="font-size:10pt;">Calibracion de medidor</td>
<td style="text-align:right;font-size:10pt;">$[calibracion-medidor]</td>
</tr>
<tr>
<td style="font-size:10pt;">Interés por mora</td>
<td style="text-align:right;font-size:10pt;">$[interes-mora]</td>
</tr>
<tr>
<td style="font-size:10pt;">Compensaciones</td>
<td style="text-align:right;font-size:10pt;">$[compensaciones]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-1]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-2]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-3]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-4]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-5]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-6]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-7]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-8]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-9]</td>
</tr>
<tr>
<td style="font-size:10pt;">item</td>
<td style="text-align:right;font-size:10pt;">$[item-10]</td>
</tr>
<tr>
<td width="70%" style="border-top:1px solid black;padding-top:5px;font-size:10pt;">Total:</td>
<td width="30%" style="border-top:1px solid black;padding-top:5px;text-align:right;font-size:10pt;">$[total-pagar]</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<!-- TOTALES -->
<td width="35%">
<table width="100%" style="font-size:8pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td width="100%" align="left">
<table width="95%" style="font-size:8pt;border:2px solid black;" cellspacing="0px" cellpadding="0px">
<tr>
<th style="border-bottom:1px solid black;">DETALLE DE ABONOS</th>
</tr>
<tr>
<td>Total Abonados:</td>
<td></td>
</tr>
<tr>
<td>Fecha Abono:</td>
<td></td>
</tr>
<tr>
<td>Comprobante Caja №:</td>
<td></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="100%">
<table width="100%" style="font-size:8pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td width="50%" style="font-size:10pt;">Fecha vencimiento:</td>
<td width="50%" style="font-size:10pt;">[fecha-vencimiento]</td>
</tr>
<tr>
<td width="50%" style="font-size:10pt;">Fecha de corte de suministro:</td>
<td width="50%" style="font-size:10pt;">[fecha-corte]</td>
</tr>
<tr>
<td width="50%" style="font-size:10pt;">Último pago realizado:</td>
<td width="50%" style="font-size:10pt;">[fecha-ultimo-pago]</td>
</tr>
<tr>
<table width="100%" style="background-color:black;color:white;font-weight:bold;font-size:10pt;" cellspacing="0px" cellpadding="0px">
<tr>
<td width="50%" >TOTAL:</td>
<td width="50%" style="background-color:black;color:white;font-weight:bold;font-size:10pt;";>[total-pagar]</td>
</tr>
</table>
</tr>
<tr>
<td align="center">
<img width="280px" src="#" alt="timbre"/>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>
答案 0 :(得分：1)
我不知道这是否已在最新版本中得到解决，但从5.5.5开始，ImageProvider存在问题。如果您没有明确设置ImageProvider iTextSharp会在内部抛出异常，请抓住它并代表您创建ImageProvider。不幸的是，这可能会发生几十次或几百次，具体取决于您处理的HTML数量。
快速解决方法是明确设置您自己的ImageProvider。这可以只是一个简单的所谓“空白图像提供者”shown here，或者你可以做一个更复杂的。{/ p>
这是一个VB.Net版本：
Public Class BlankImageProvider
Implements IImageProvider
Public Function GetImageRootPath() As String Implements IImageProvider.GetImageRootPath
Return ""
End Function
Public Sub Reset() Implements IImageProvider.Reset
End Sub
Public Function Retrieve(src As String) As iTextSharp.text.Image Implements IImageProvider.Retrieve
Return Nothing
End Function
Public Sub Store(src As String, img As iTextSharp.text.Image) Implements IImageProvider.Store
End Sub
End Class
要使用它，您只需使用HtmlPipelineContext方法将其绑定到SetImageProvider对象：
htmlContext.SetImageProvider(New BlankImageProvider())
此外，我不知道这些因素是否存在，但您的HTML在某些方面在技术上并不准确。例如，您在HTML属性中使用px，但实际上您只能使用带百分号的数字或数字。例如，cellpadding="0px"无效，应为cellpadding="0"。您还有至少一个<table>代码，该代码直接是<tr>的子代，但应该有一个中间<td>或<th>代码。这些事情可能会或可能不会影响iTextSharp的速度，但它可能会使事情更具前瞻性。