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在我的 ASP.NET Core MVC 项目中，我想以PDF格式输出页面中包含的一些数据。我尝试了几个库，但由于某种原因它不起作用。有谁能帮助我吗？如果您支持直接工作的示例或项目，我将非常高兴。

我尝试的最后一种方法是使用 iText 库。这有效，但空白页来了。

.cshtml使用 jQuery 库：

<button id="btnPdf">Generate PDF</button>    
$('#btnPdf').click(function () {
                window.open('../Home/PrintStudent?param=1');
});

家庭控制器：

public class HomeController : Controller
{
    private readonly IWebHostEnvironment _oHostEnvironment;

    [Obsolete] 
    private IHostingEnvironment _env;

    private string projectRootPath;
    private string outputPath;
    private string storagePath;
    List<string> lstFiles;

    [Obsolete]
    public HomeController(IWebHostEnvironment oHostEnvironment, IHostingEnvironment env)
    {
        _env = env;
        _oHostEnvironment = oHostEnvironment;
        projectRootPath = _env.ContentRootPath;
        outputPath = Path.Combine(projectRootPath, "wwwroot/Uploads/viewer");
        storagePath = Path.Combine(projectRootPath, "wwwroot/Uploads");
    }

    [Route("PrintStudent")]
    public ActionResult PrintStudent(int param)
    {
        List<PdfModel> oStudents = new List<PdfModel>();

        for (int i = 1; i < 10; i++)
        {
            PdfModel oStudent = new PdfModel();
            oStudent.Id = i;
            oStudent.Name = "Student" + i;
            oStudent.Address = "Address" + i;
            oStudents.Add(oStudent);
        }

        StudentReport rpt = new StudentReport(_oHostEnvironment);
        return File(rpt.Report(oStudents), "application/pdf");
    }
}

学生报告.cs

using Helpers.CommonModels;
using iTextSharp.text;
using iTextSharp.text.pdf;
using Microsoft.AspNetCore.Hosting;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace DenizAnalizMain.Reports
{
    public class StudentReport
    {
        private readonly IWebHostEnvironment _oHostEnvironment;

        public StudentReport(IWebHostEnvironment oHostEnvironment)
        {
            _oHostEnvironment = oHostEnvironment;
        }

        int _maxColumn = 3;
        Document _document;
        Font _fontStyle;
        PdfPCell _pdfCell;
        PdfPTable _pdfTable = new PdfPTable(3);
        MemoryStream _memoryStream = new MemoryStream();

        List<PdfModel> _oStudents = new List<PdfModel>();

        public byte[] Report(List<PdfModel> oStudents)
        {
            _oStudents = oStudents;

            _document = new Document();
            _document.SetPageSize(PageSize.A4);
            _document.SetMargins(5f, 5f, 20f, 5f);

            _pdfTable.WidthPercentage = 100;
            _pdfTable.HorizontalAlignment = Element.ALIGN_LEFT;

            _fontStyle = FontFactory.GetFont("Tahoma", 8f, 1);
            PdfWriter docWrite = PdfWriter.GetInstance(_document, _memoryStream);

            _document.Open();

            float[] sizes = new float[_maxColumn];

            for (int i = 0; i < _maxColumn; i++)
            {
                if (i == 0) sizes[i] = 20;
                else sizes[i] = 100;
            }

            _pdfTable.SetWidths(sizes);

            this.ReportHeader();
            this.EmptyRow(2);
            this.ReportBody();

            _pdfTable.HeaderRows = 2;
            _document.Add(_pdfTable);

            _document.Close();

            return _memoryStream.ToArray();
        }

        private void ReportHeader()
        {
            _pdfCell = new PdfPCell(this.AddLogo());
            _pdfCell.Colspan = 1;
            _pdfCell.Border = 0;
            _pdfTable.AddCell(_pdfCell);

            _pdfCell = new PdfPCell(this.SetPageTitle());
            _pdfCell.Colspan = _maxColumn -1;
            _pdfCell.Border = 0;
            _pdfTable.AddCell(_pdfCell);

            _pdfTable.CompleteRow();
        }

        private PdfPTable AddLogo()
        {
            int maxColumn = 1;
            PdfPTable pdfPTable = new PdfPTable(maxColumn);

            string path = _oHostEnvironment.WebRootPath + "/images";

            string imgCombine = Path.Combine(path, "denizyatirimTransparent.png");
            Image img = Image.GetInstance(imgCombine);

            _pdfCell = new PdfPCell(img);
            _pdfCell.Colspan = maxColumn;
            _pdfCell.HorizontalAlignment = Element.ALIGN_LEFT;
            _pdfCell.Border = 0;
            _pdfCell.ExtraParagraphSpace = 0;
            pdfPTable.AddCell(_pdfCell);

            pdfPTable.CompleteRow();

            return pdfPTable;
        }

        private PdfPTable SetPageTitle()
        {
            int maxColumn = 3;
            PdfPTable pdfPTable = new PdfPTable(maxColumn);

            _fontStyle = FontFactory.GetFont("Tahoma", 18f, 1);
            _pdfCell = new PdfPCell(new Phrase("Student Information", _fontStyle));
            _pdfCell.Colspan = maxColumn;
            _pdfCell.HorizontalAlignment = Element.ALIGN_CENTER;
            _pdfCell.Border = 0;
            _pdfCell.ExtraParagraphSpace = 0;
            pdfPTable.AddCell(_pdfCell);
            pdfPTable.CompleteRow();

            _fontStyle = FontFactory.GetFont("Tahoma", 14f, 1);
            _pdfCell = new PdfPCell(new Phrase("School Name", _fontStyle));
            _pdfCell.Colspan = maxColumn;
            _pdfCell.HorizontalAlignment = Element.ALIGN_CENTER;
            _pdfCell.Border = 0;
            _pdfCell.ExtraParagraphSpace = 0;
            pdfPTable.AddCell(_pdfCell);
            pdfPTable.CompleteRow();

            return pdfPTable;
        }

        private void EmptyRow(int nCount)
        {
            for (int i = 1; i < nCount; i++)
            {
                _pdfCell = new PdfPCell(new Phrase("", _fontStyle));
                _pdfCell.Colspan = _maxColumn; 
                _pdfCell.Border = 0;
                _pdfCell.ExtraParagraphSpace = 10;
                _pdfTable.AddCell(_pdfCell);
                _pdfTable.CompleteRow();
            }
        }

        private void ReportBody()
        {
            var fontStyleBold = FontFactory.GetFont("Tahoma", 9f, 1);
            _fontStyle = FontFactory.GetFont("Tahoma", 9f, 0);

            #region Detail Table Header
            _pdfCell = new PdfPCell(new Phrase("Id", fontStyleBold));
            _pdfCell.HorizontalAlignment = Element.ALIGN_CENTER;
            _pdfCell.VerticalAlignment = Element.ALIGN_MIDDLE;
            _pdfCell.BackgroundColor = BaseColor.Gray;
            _pdfTable.AddCell(_pdfCell);

            _pdfCell = new PdfPCell(new Phrase("Name", fontStyleBold));
            _pdfCell.HorizontalAlignment = Element.ALIGN_CENTER;
            _pdfCell.VerticalAlignment = Element.ALIGN_MIDDLE;
            _pdfCell.BackgroundColor = BaseColor.Gray;
            _pdfTable.AddCell(_pdfCell);

            _pdfCell = new PdfPCell(new Phrase("Address", fontStyleBold));
            _pdfCell.HorizontalAlignment = Element.ALIGN_CENTER;
            _pdfCell.VerticalAlignment = Element.ALIGN_MIDDLE;
            _pdfCell.BackgroundColor = BaseColor.Gray;
            _pdfTable.AddCell(_pdfCell);

            _pdfTable.CompleteRow();
            #endregion

            #region Detail table body
            foreach (var oStudent in _oStudents)
            {
                _pdfCell = new PdfPCell(new Phrase(oStudent.Id.ToString(), fontStyleBold));
                _pdfCell.HorizontalAlignment = Element.ALIGN_CENTER;
                _pdfCell.VerticalAlignment = Element.ALIGN_MIDDLE;
                _pdfCell.BackgroundColor = BaseColor.Gray;
                _pdfTable.AddCell(_pdfCell);

                _pdfCell = new PdfPCell(new Phrase(oStudent.Name.ToString(), fontStyleBold));
                _pdfCell.HorizontalAlignment = Element.ALIGN_CENTER;
                _pdfCell.VerticalAlignment = Element.ALIGN_MIDDLE;
                _pdfCell.BackgroundColor = BaseColor.Gray;
                _pdfTable.AddCell(_pdfCell);

                _pdfCell = new PdfPCell(new Phrase(oStudent.Address.ToString(), fontStyleBold));
                _pdfCell.HorizontalAlignment = Element.ALIGN_CENTER;
                _pdfCell.VerticalAlignment = Element.ALIGN_MIDDLE;
                _pdfCell.BackgroundColor = BaseColor.Gray;
                _pdfTable.AddCell(_pdfCell);

                _pdfTable.CompleteRow();
            }
            #endregion
        }
    }
}
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1 回答 1

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我使用Rotativa.AspNetCore运行它。它有一个简单的用法。供你参考。您可以通过 nuget 下载和使用它。

于 2020-06-18T07:06:31.650 回答