使用WebAPI控制器打印为PDF [英] Print to PDF using WebAPI Controller
问题描述
我要打印当前页"转换为PDF.
I want to print "Current Page" to PDF.
我想使用 Visual Studio的WebAPI控制器.因此，在通过JavaScript调用控制器类的Action方法时，它应该打印当前页面.
I want to do this using WebAPI Controller of visual studio. So that, on calling the Action method of the controller class via JavaScript , it should print the current page.
我已经编写了代码，但是当我通过点击url调用控制器类时( http://localhost:61045/api/测试/操作)，不会产生任何结果(不打印该页面的PDF)...
I have written the code but when I call the controller class by hitting the url (http://localhost:61045/api/Test/Action ) on browser , it does not produce any result(Do not print PDF of that page)...
下面是我的控制器类代码...
Below is my Controller Class code...
命名空间TestWebAPI.Controllers
{
公共类TestController:ApiController
{
公共HttpRequest请求者{ }
namespace TestWebAPI.Controllers
{
public class TestController : ApiController
{
public HttpRequest Requester { get; }
public HttpResponse Response {get; }
public HttpResponse Response { get; }
[HttpGet]
公共无效Action()
{
试试
{
[HttpGet]
public void Action()
{
try
{
WebClient myClient = new WebClient();
字符串myPageHTML = null;
StringBuilder strText = new StringBuilder();
strText.Append(``< html>< head/>< body>'');
byte [] requestHTML;
WebClient myClient = new WebClient();
string myPageHTML = null;
StringBuilder strText = new StringBuilder();
strText.Append("<html><head/><body>");
byte[] requestHTML;
//获取页面的网址
字符串currentPageUrl = Requester.Url.ToString();
myClient.UseDefaultCredentials = true;
UTF8Encoding utf8 =新的UTF8Encoding();
// Gets the url of the page
string currentPageUrl = Requester.Url.ToString();
myClient.UseDefaultCredentials = true;
UTF8Encoding utf8 = new UTF8Encoding();
requestHTML = myClient.DownloadData(currentPageUrl);
requestHTML = myClient.DownloadData(currentPageUrl);
myPageHTML = utf8.GetString(requestHTML);
HtmlDocument doc =新的HtmlDocument();
doc.LoadHtml(myPageHTML);
myPageHTML = utf8.GetString(requestHTML);
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(myPageHTML);
strText.Append(</body></html>");
AddtoPDF(strText.ToString());
}
catch(异常例外)
{
}
}
strText.Append("</body></html>");
AddtoPDF(strText.ToString());
}
catch (Exception ex)
{
}
}
///< summary>
///调用此函数以创建html表单.
///</summary>
受保护的void AddtoPDF(string htmlText)
{
试试
{
Response.ClearContent();
Response.ClearHeaders();
Response.ContentType ="application/pdf";
Response.AddHeader("content-disposition"，"attachment; filename = MyPDF.pdf");
StringReader sr = new StringReader(htmlText);
文档pdfDoc =新文档(PageSize.A4、10f，10f，100f，0f);
HTMLWorker htmlparser =新的HTMLWorker(pdfDoc);
PdfWriter.GetInstance(pdfDoc，Response.OutputStream);
pdfDoc.Open();
htmlparser.Parse(sr);
pdfDoc.Close();
Response.Write(pdfDoc);
Response.Flush();
Response.Clear();
}
catch(异常例外)
{
}
/// <summary>
/// This function is called to create of form html.
/// </summary>
protected void AddtoPDF(string htmlText)
{
try
{
Response.ClearContent();
Response.ClearHeaders();
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=MyPDF.pdf");
StringReader sr = new StringReader(htmlText);
Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
htmlparser.Parse(sr);
pdfDoc.Close();
Response.Write(pdfDoc);
Response.Flush();
Response.Clear();
}
catch (Exception ex)
{
}
}
}
}
}
}
}
推荐答案
我建议您使用JSPDF库满足此要求，您可以在下面的链接中查看示例.
https://gist.github.com/rajendarreddyj/de8bbe0b774c53de1ed5be8dd4ada22b
https://micropyramid.com/blog/export-html-web-page-to-pdf-using-jspdf/
如果您确实想使用网络API，则可以使用pdfsharp库.
https://github.com/empira/PDFsharp/
示例代码:
PdfDocument pdf = new PdfDocument();
pdf.Info.Title = "My First PDF";
PdfPage pdfPage = pdf.AddPage();
XGraphics graph = XGraphics.FromPdfPage(pdfPage);
XFont font = new XFont("Verdana", 20, XFontStyle.Bold);
graph.DrawString("This is my first PDF document", font, XBrushes.Black, new XRect(0, 0, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.Center);
string pdfFilename = "firstpage.pdf";
using (MemoryStream ms = new MemoryStream())
{
pdf.Save(ms, false);
byte[] buffer = new byte[ms.Length];
ms.Seek(0, SeekOrigin.Begin);
ms.Flush();
ms.Read(buffer, 0, (int)ms.Length);
byte[] docBytes = ms.ToArray();
Response.ContentType = "application/pdf";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + pdfFilename + "");
Response.Write("<b>File Contents: </b>");
Response.BinaryWrite(docBytes);最好的问候，
Lee
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