1
我正在使用以下库来生成PDF文档（https://www.nuget.org/packages/HtmlRenderer.PdfSharp）。C＃PdfSharp - 困难从HTML生成PDF
[ValidateInput(false)]
public FileStreamResult GeneratePDF(String html)
{
MemoryStream stream = new MemoryStream();;
CssData css = PdfGenerator.ParseStyleSheet(System.IO.File.ReadAllText(Server.MapPath("~/Content/pdfForms.css")));
PdfDocument doc = new PdfDocument();
doc = PdfGenerator.GeneratePdf(html, PdfSharp.PageSize.A4, 25, css);
doc.Save(stream, false);
byte[] file = stream.ToArray();
stream.Write(file, 0, file.Length);
stream.Position = 0;
return new FileStreamResult(stream, "application/pdf");
}
我在尝试使用库时遇到了一些奇怪的问题。 HTML字符串正在被正确传递，但我收到以下错误。
An exception of type 'System.InvalidOperationException' occurred in PdfSharp.dll but was not handled in user code
Additional information: Cannot save a PDF document with no pages.
然而，在html变量如下所示：
<table><tr><th colspan=9><h2>Pre-Screening Notice and Certification Requesiton for the Work Opportunity Credit</h2><h3 class='formInfo'>Information about Form 8850 and its separate instructions is at www.irs.gov/form8850</h3><h3 class='formInstructions'>Job applicant: Fill in the lines below and check any boxes that apply.</h3></th></tr><tr><td colspan=2>Your name </td><td colspan=3><span class='userInput'>form.EmployeeName</span></td><td colspan=2>Social security number</td><td colspan=2><span class='userInput'>form.SSN</td></tr><tr><td colspan=3>Street Address: </td><td colspan=6><span class='userInput'>form.StreetAddress</span></td></tr><tr><td colspan=3>City or town, state, and ZIP code </td><td colspan=6><span class='userInput'>90210</span></td></tr><tr><td colspan=2>County</td><td colspan=3><span class='userInput'>form.County</span></td><td colspan=2>Telephone</td><td colspan=2><span class='userInput'>1234567890 </span></td></tr><tr><td colspan=5>If you are under age 40, enter your date of birth (month, day, year) </td><td colspan=4><span class='userInput'>form.DOB</span></td></tr><tr><td><input type='checkbox' checked /></td><td colspan=8> Check here if you received a conditional certification from the state workforce agency (SWA) or a participating local agency for the work opportunity credit. </td></tr><tr><td><input type='checkbox' checked /></td><td colspan=8> Check here if <b>any</b> of the following statements apply to you. <ul> <li> I am a member of a family that has received assistance from Temporary Assistance for Needy Families (TANF) for any 9 months during the past 18 months. </li> <li> I am a veteran and a member of a family that received Supplemental Nutrition Assistance Program (SNAP) benefits (food stamps) for at least a 3-month period during the past 15 months. </li> <li> I was referred here by a rehabilitation agency approved by the state, an employment network under the Ticket to Work program, or the Department of Veterans Affairs. </li> <li> I am at least age 18 but not age 40 or older and I am a member of a family that: <ul class='letterList'> <li> Received SNAP benefits (food stamps) for the past 6 months; or </li> <li> Received SNAP benefits (food stamps) for at least 3 of the past 5 months, but is no longer eligible to receive them.</li> </ul> </li> <li>During the past year, I was convicted of a felony or released from prison for a felony.</li> <li> I received supplemental security income (SSI) benefits for any month ending during the past 60 days. </li> <li>I am a veteran and I was unemployed for a period or periods totaling at least 4 weeks but less than 6 months during the past year.</li> </ul> </td></tr><tr><td><input type='checkbox' checked /> </td><td colspan=8> Check here if you are a veteran and you were unemployed for a period or periods totaling at least 6 months during the pastyear.</td></tr><tr><td><input type='checkbox' checked /></td><td colspan=8>Check here if you are a veteran entitled to compensation for a service-connected disability and you were discharged or released from active duty in the U.S. Armed Forces during the past year.</td></tr><tr><td><input type='checkbox' checked /><td><td colspan=8>Check here if you are a veteran entitled to compensation for a service-connected disability and you were unemployed for a period or periods totaling at least 6 months during the past year.<td></tr> <tr><td><input type='checkbox' checked /></td><td colspan=8>Check here if you are a member of a family that: <ul> <li>Received TANF payments for at least the past 18 months; <b>or</b></li> <li> Received TANF payments for any 18 months beginning after August 5, 1997, <b>and</b> the earliest 18-month period beginning after August 5, 1997, ended during the past 2 years; <b>or</b> </li> <li> Stopped being eligible for TANF payments during the past 2 years because federal or state law limited the maximum time those payments could be made.</li> </ul></td></tr> <tr><td> <input type='checkbox' checked /> </td> <td colspan=8>Check here if you are in a period of unemployment that is at least 27 consecutive weeks and for all or part of that period you received unemployment compensation.</td></tr></fieldset><tr><td colspan=9> <h3 class='formInstructions'>Signature - All Applicants Must Sign.</h3> <p>Under penalties of perjury, I declare that I gave the above information to the employer on or before the day I was offered a job, and it is, to the best of my knowledge, true, correct, and complete</p></td></tr><tr><td colspan=3>Job applicant's signature</td><td colspan=4><img class='img-responsive' 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/></td><td colspan=2>Date</td> <td colspan=2><span class='userInput'>form.SignedDate</span></td></tr></table>
我在一个单独的文件中保存的HTML并在浏览器中打开它，它只是显示。
此外，我试图在<html><body></body></html>包装HTML。奇怪的是，我没有收到任何错误，但得到了一个空白的PDF。
万一有帮助，通过以下生成的HTML：
public partial class Form8850
{/** code omitted for brevity **/
public string WriteForm()
{
String html = "<table><tr><th colspan=9><h2>Pre-Screening Notice and Certification Requesiton for the Work Opportunity Credit</h2>";
html += "<h3 class='formInfo'>Information about Form 8850 and its separate instructions is at www.irs.gov/form8850</h3>";
html += "<h3 class='formInstructions'>Job applicant: Fill in the lines below and check any boxes that apply.</h3></th></tr>";
html += String.Format("<tr><td colspan=2>Your name </td><td colspan=3><span class='userInput'>{0}</span></td><td colspan=2>Social security number</td><td colspan=2><span class='userInput'>{1}</td></tr>", this.EmployeeName, this.SSN);
html += String.Format("<tr><td colspan=3>Street Address: </td><td colspan=6><span class='userInput'>{0}</span></td></tr>", this.StreetAddress);
html += String.Format("<tr><td colspan=3>City or town, state, and ZIP code </td><td colspan=6><span class='userInput'>{0}</span></td></tr>", this.CityStateZip);
html += String.Format("<tr><td colspan=2>County</td><td colspan=3><span class='userInput'>{0}</span></td><td colspan=2>Telephone</td><td colspan=2><span class='userInput'>{1} </span></td></tr>", this.County, this.Telephone);
html += String.Format("<tr><td colspan=5>If you are under age 40, enter your date of birth (month, day, year) </td><td colspan=4><span class='userInput'>{0}</span></td></tr>", (this.DOB != null) ? this.DOB : "");
html += String.Format("<tr><td><input type='checkbox' {0} /></td><td colspan=8> Check here if you received a conditional certification from the state workforce agency (SWA) or a participating local agency for the work opportunity credit. </td></tr>", IsQ1Checked ? "checked" : "");
html += String.Format("<tr><td><input type='checkbox' {0} /></td><td colspan=8> Check here if <b>any</b> of the following statements apply to you. <ul> <li> I am a member of a family that has received assistance from Temporary Assistance for Needy Families (TANF) for any 9 months during the past 18 months. </li> <li> I am a veteran and a member of a family that received Supplemental Nutrition Assistance Program (SNAP) benefits (food stamps) for at least a 3-month period during the past 15 months. </li> <li> I was referred here by a rehabilitation agency approved by the state, an employment network under the Ticket to Work program, or the Department of Veterans Affairs. </li> <li> I am at least age 18 but not age 40 or older and I am a member of a family that: <ul class='letterList'> <li> Received SNAP benefits (food stamps) for the past 6 months; or </li> <li> Received SNAP benefits (food stamps) for at least 3 of the past 5 months, but is no longer eligible to receive them.</li> </ul> </li> <li>During the past year, I was convicted of a felony or released from prison for a felony.</li> <li> I received supplemental security income (SSI) benefits for any month ending during the past 60 days. </li> <li>I am a veteran and I was unemployed for a period or periods totaling at least 4 weeks but less than 6 months during the past year.</li> </ul> </td></tr>", IsQ2Checked ? "checked" : "");
html += String.Format("<tr><td><input type='checkbox' {0} /> </td><td colspan=8> Check here if you are a veteran and you were unemployed for a period or periods totaling at least 6 months during the pastyear.</td></tr>", IsQ3Checked ? "checked" : "");
html += String.Format("<tr><td><input type='checkbox' {0} /></td><td colspan=8>Check here if you are a veteran entitled to compensation for a service-connected disability and you were discharged or released from active duty in the U.S. Armed Forces during the past year.</td></tr>", IsQ4Checked ? "checked" : "");
html += String.Format("<tr><td><input type='checkbox' {0} /><td><td colspan=8>Check here if you are a veteran entitled to compensation for a service-connected disability and you were unemployed for a period or periods totaling at least 6 months during the past year.<td></tr> ", IsQ5Checked ? "checked" : "");
html += String.Format("<tr><td><input type='checkbox' {0} /></td><td colspan=8>Check here if you are a member of a family that: <ul> <li>Received TANF payments for at least the past 18 months; <b>or</b></li> <li> Received TANF payments for any 18 months beginning after August 5, 1997, <b>and</b> the earliest 18-month period beginning after August 5, 1997, ended during the past 2 years; <b>or</b> </li> <li> Stopped being eligible for TANF payments during the past 2 years because federal or state law limited the maximum time those payments could be made.</li> </ul></td></tr> ", IsQ6Checked ? "checked" : "");
html += String.Format("<tr><td> <input type='checkbox' {0} /> </td> <td colspan=8>Check here if you are in a period of unemployment that is at least 27 consecutive weeks and for all or part of that period you received unemployment compensation.</td></tr></fieldset>", IsQ7Checked ? "checked" : "");
html += "<tr><td colspan=9> <h3 class='formInstructions'>Signature - All Applicants Must Sign.</h3> <p>Under penalties of perjury, I declare that I gave the above information to the employer on or before the day I was offered a job, and it is, to the best of my knowledge, true, correct, and complete</p></td></tr>";
html += String.Format("<tr><td colspan=3>Job applicant's signature</td><td colspan=4><img class='img-responsive' src={0} /></td><td colspan=2>Date</td> <td colspan=2><span class='userInput'>{1}</span></td></tr></table>", this.form8850SigData, this.SignedDate);
return html;
}
，并传递到一个视图
<h1>Review and Confirm</h1>
<h2>Please review your document below. </h2>
<form target="_blank" method="post" action="GeneratePDF" > <input type='hidden' name='html' value="@Model.htmlForm "/> <button class="btn-block btn-primary ">View</button></form>
由控制器方法
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Confirm8850(Form8850 form)
{
Confirm8850ViewModel vm = new Confirm8850ViewModel();
String formData = form.WriteForm();
vm.form = form;
vm.htmlForm = formData;
// vm.tempPDFPath = GeneratePDF(formData, String.Format("{0}_{1}_8850", model.newHire.LastName, model.newHire.FirstName), true);
return View(vm);
}
任何意见将不胜感激。
我在找到“从htmlrenderer pdfsharp插入部分”时发现它，它有一个论坛帖子提到一个错误，您必须将页面复制到新文档中。但类似地，有人在使用pdfdocument对象之前没有添加页面时遇到了问题。 – Tyeth