我正在参与一个需要将当前HTML页面转换为PDF并在点击按钮后自动保存到服务器并将其引用保存在数据库中的项目。如果页面数据来自数据库，则可以将视图转换为PDF，但是此表单中的数据是静态的，也就是说，在页面上有许多单选按钮和文本框，我可以在其中写入详细信息并勾选复选框，点击保存按钮后，它将保存在服务器上，并将其引用保存在数据库中。
之所以不将数据保存在数据库中的原因是报告对客户来说不是很有用，但如果我将数据保存在数据库中，则数据库会变得非常庞大且难以处理。因为该报告有大约100个字段。因此，请帮助我解决这个问题。
[HttpPost]
public ActionResult Convert(FormCollection collection)
{
// read parameters from the webpage
string url = collection["TxtUrl"];
string pdf_page_size = collection["DdlPageSize"];
PdfPageSize pageSize = (PdfPageSize)Enum.Parse(typeof(PdfPageSize), pdf_page_size, true);
string pdf_orientation = collection["DdlPageOrientation"];
PdfPageOrientation pdfOrientation = (PdfPageOrientation)Enum.Parse(
typeof(PdfPageOrientation), pdf_orientation, true);
int webPageWidth = 1024;
try
{
webPageWidth = System.Convert.ToInt32(collection["TxtWidth"]);
}
catch { }
int webPageHeight = 0;
try
{
webPageHeight = System.Convert.ToInt32(collection["TxtHeight"]);
}
catch { }
// instantiate a html to pdf converter object
HtmlToPdf converter = new HtmlToPdf();
// set converter options
converter.Options.PdfPageSize = pageSize;
converter.Options.PdfPageOrientation = pdfOrientation;
converter.Options.WebPageWidth = webPageWidth;
converter.Options.WebPageHeight = webPageHeight;
// create a new pdf document converting an url
PdfDocument doc = converter.ConvertUrl(url);
// save pdf document
byte[] pdf = doc.Save();
// close pdf document
doc.Close();
// return resulted pdf document
FileResult fileResult = new FileContentResult(pdf, "application/pdf");
fileResult.FileDownloadName = "Document.pdf";
return fileResult;
}
您可以在这里找到VB.NET MVC版本的代码：http://selectpdf.com/convert-from-html-to-pdf-in-asp-net-mvc-csharp-and-vb-net/
该链接提供了将HTML转换为PDF的ASP.NET MVC C#和VB.NET代码示例。 public static Byte[] PdfSharpConvert(String html)
{
Byte[] res = null;
using (MemoryStream ms = new MemoryStream())
{
var pdf = TheArtOfDev.HtmlRenderer.PdfSharp.PdfGenerator.GeneratePdf(html, PdfSharp.PageSize.A4);
pdf.Save(ms);
res = ms.ToArray();
}
return res;
}
[HttpPost]
public ActionResult ConvertCurrentPageToPdf(FormCollection collection)
{
object model = null;
ViewDataDictionary viewData = new ViewDataDictionary(model);
// The string writer where to render the HTML code of the view
StringWriter stringWriter = new StringWriter();
// Render the Index view in a HTML string
ViewEngineResult viewResult = ViewEngines.Engines.FindView(ControllerContext, "Index", null);
ViewContext viewContext = new ViewContext(
ControllerContext,
viewResult.View,
viewData,
new TempDataDictionary(),
stringWriter
);
viewResult.View.Render(viewContext, stringWriter);
// Get the view HTML string
string htmlToConvert = stringWriter.ToString();
// Get the base URL
String currentPageUrl = this.ControllerContext.HttpContext.Request.Url.AbsoluteUri;
String baseUrl = currentPageUrl.Substring(0, currentPageUrl.Length - "Convert_Current_Page/ConvertCurrentPageToPdf".Length);
// Create a HTML to PDF converter object with default settings
HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();
// Convert the HTML string to a PDF document in a memory buffer
byte[] outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlToConvert, baseUrl);
// Send the PDF file to browser
FileResult fileResult = new FileContentResult(outPdfBuffer, "application/pdf");
fileResult.FileDownloadName = "Convert_Current_Page.pdf";
return fileResult;
}
使用ABCpdf DLL，在文本区域中可以编写HTML代码，并在单击按钮时显示相应的PDF。可以轻松下载ABCpdf试用版，添加链接以下载ABCpdf DLL。https://www.websupergoo.com/download.htm
index.cshtml
@using (Html.BeginForm("covertopdf", "simple", FormMethod.Post))
{
<p style="margin-top:50px">
Input Html: @Html.TextArea("Htmlcontent", new { @class = "form-control",@cols="160" , @rows="20"})<br />
<input type="submit" class="btn-primary" value="Convertopdf" />
</p>
}
SimpleController.cs
public class SimpleController : Controller
{
public class FileViewModel
{
public byte[] Content { get; set; }
public string Extension { get; set; }
public string FileName { get; set; }
}
[HttpPost]
[ValidateInput(false)]
public FileStreamResult covertopdf(string Htmlcontent)
//public FileStreamResult covertopdf(file fo)
{
var result = ExecuteAction(() =>
{
var fileViewmodel = new FileViewModel
{
Content = ConvertHtmlToPdf(Htmlcontent),
//Content= ConvertHtmlToPdf(fo.cont),
Extension = "application/pdf",
FileName = "Policy Information.pdf"
};
return fileViewmodel;
}, "covertopdf");
// return result;
HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
// Content is the file
Stream stream = new MemoryStream(result.Content);
return new FileStreamResult(stream, "application/pdf")
{
};
}
public T ExecuteAction<T>(Func<T> action, string method)
{
try
{
return action.Invoke();
}
catch (Exception ex)
{
return default(T);
}
}
protected byte[] ConvertHtmlToPdf(string html, string header = null, string footer = null, bool isPageNumberInFooter = false)
{
// Create ABCpdf Doc object
var doc = new Doc();
if (header == null && footer == null)
doc.Rect.Inset(20, 20);
else
doc.Rect.String = "0 70 600 760"; /*padding from left, padding from bottom, width from left, height from bottom*/
// Add html to Doc
//html = "<html><head></head><body></body></html>";
int theId = doc.AddImageHtml(html);
// Loop through document to create multi-page PDF
while (true)
{
if (!doc.Chainable(theId))
break;
doc.Page = doc.AddPage();
theId = doc.AddImageToChain(theId);
}
var count = doc.PageCount;
/*****************Footer area******************/
if (footer != null)
{
var newfooter = "";
doc.Rect.String = "40 20 580 50";
for (int i = 1; i <= count; i++)
{
doc.PageNumber = i;
if (isPageNumberInFooter)
{
newfooter = footer.Replace("PageNumber", "Page " + i.ToString() + " of " + count.ToString());
int id = doc.AddImageHtml(newfooter);
while (true)
{
if (!doc.Chainable(id))
break;
id = doc.AddImageToChain(id);
}
}
else
doc.AddText(footer);
}
}
/*****************Footer area******************/
// Flatten the PDF
for (int i = 1; i <= doc.PageCount; i++)
{
doc.PageNumber = i;
doc.Flatten();
}
var pdf = doc.GetData();
doc.Clear();
// Get PDF as byte array. Couls also use .Save() to save to disk
return pdf;
}
}
我使用iDiTect.Converter将html转换为pdf在asp.net mvc中https://www.iditect.com/tutorial/html-to-pdf/，但它不是免费的 简短代码
public static Byte[] ConvertToBytes()
{
HtmlToPdfConverter converter = new HtmlToPdfConverter();
converter.DefaultStyleSheet = ".para{font-size: 24px; color: #FF0000;}";
string htmlContent = "<p class=\"para\">Content with special style.</p><p>Content without style</p>";
converter.Load(htmlContent);
return converter.SaveAsBytes();
}
有许多针对.NET的html转pdf转换器可用。我可以推荐ExpertPdf（www.html-to-pdf.net）。
代码大致如下：
PdfConverter pdfConverter = new PdfConverter();
pdfConverter.PdfDocumentOptions.PdfPageSize = PdfPageSize.A4;
byte[] downloadBytes = pdfConverter.GetPdfFromUrlBytes(url);
这里有一个在线演示： http://www.html-to-pdf.net/free-online-pdf-converter.aspx
将Canvas转换为PDF是正确的选择
function getPDF(){
var HTML_Width = $(".canvas_div_pdf").width();
var HTML_Height = $(".canvas_div_pdf").height();
var top_left_margin = 15;
var PDF_Width = HTML_Width+(top_left_margin*2);
var PDF_Height = (PDF_Width*1.5)+(top_left_margin*2);
var canvas_image_width = HTML_Width;
var canvas_image_height = HTML_Height;
var totalPDFPages = Math.ceil(HTML_Height/PDF_Height)-1;
html2canvas($(".canvas_div_pdf")[0],{allowTaint:true}).then(function(canvas) {
canvas.getContext('2d');
console.log(canvas.height+" "+canvas.width);
var imgData = canvas.toDataURL("image/jpeg", 1.0);
var pdf = new jsPDF('p', 'pt', [PDF_Width, PDF_Height]);
pdf.addImage(imgData, 'JPG', top_left_margin, top_left_margin,canvas_image_width,canvas_image_height);
for (var i = 1; i <= totalPDFPages; i++) {
pdf.addPage(PDF_Width, PDF_Height);
pdf.addImage(imgData, 'JPG', top_left_margin, -(PDF_Height*i)+(top_left_margin*4),canvas_image_width,canvas_image_height);
}
pdf.save("HTML-Document.pdf");
});
};