如何在ASP.NET Core 中快速構建PDF文檔

時間 2019-12-16

標籤如何 asp.net asp core 快速構建 pdf 文檔欄目 ASP 简体版

原文原文鏈接

　　好比咱們須要ASP.NET Core 中須要經過PDF來進行某些簡單的報表開發，隨着這並不難，但仍是會手忙腳亂的去搜索一些資料，那麼恭喜您，這篇帖子會幫助到您，咱們就不會再去浪費一些寶貴的時間。css

　　在本文中咱們將要使用DinkToPDF來處理咱們在.NET Core Web 程序中進行構建PDF文檔！就如今咱們很少說，直接開始有趣的部分。html

前言

　　您能夠經過建立PDF文檔在個人倉庫中，獲取源代碼，歡迎給個免費的Star...git

　　如今咱們建立一個.NET Core 3.0 項目，至因而mvc、Api、這些我並不在乎。建立項目後直接Nuget安裝DinkToPDF。隨後您須要下載個人代碼倉庫中的「NativeLibrary」文件夾，在其中，咱們將找到兩個文件32bit和64bit，所以咱們須要爲操做系統選擇合適的庫。咱們將從64位文件夾中選擇文件。github

　　最後，咱們須要啓動該庫，而且IOC DinkToPDF。數據庫

public void ConfigureServices(IServiceCollection services)
        {
            var context = new CustomAssemblyLoadContext();
            context.LoadUnmanagedLibrary(Path.Combine(Directory.GetCurrentDirectory(), "libwkhtmltox.dll"));

            services.AddSingleton(typeof(IConverter), new SynchronizedConverter(new PdfTools()));
            services.AddControllers();
        }

創建實體

在真實狀況的項目中，咱們能夠從數據庫中收集數據或從其餘API接收數據。可是爲了簡單起見，咱們將從本地存儲中收集PDF文檔的數據。隨後，咱們將建立一個HTML模板並將其存儲在PDF文檔中。api

 public class Employee
    {
        public string Name { get; set; }
        public string LastName { get; set; }
        public int Age { get; set; }
        public string Gender { get; set; }
    }

再隨後，咱們要建立一個新的文件夾Services和裏面兩類文件 DataServices.cs 和 TemplateGenerator.cs 。完整的結構應以下所示：服務器

public class DataServices
    {
        public static List<Employee> GetAllEmployess() =>
           new List<Employee>
           {
                new Employee { Name="Hao Zi Zhang", LastName="Turner", Age=35, Gender="Male"},
                new Employee { Name="Yu Chen", LastName="Markus", Age=22, Gender="Female"},
                new Employee { Name="Jian Zhi Chu", LastName="Martins", Age=40, Gender="Male"},
                new Employee { Name="ElderJames", LastName="Packner", Age=30, Gender="Female"},
                new Employee { Name="BlaZui", LastName="Doe", Age=45, Gender="Male"}
           };
    }

其中添加服務中返回了某些數據，用於模擬服務。咱們要生成一個HTML模板，所以咱們須要修改 TemplateGenerator.cs 文件：mvc

public class TempleGenertor
    {
        public static string GetHTMLString()
        {
            var employees = DataServices.GetAllEmployess();

            var sb = new StringBuilder();
            sb.Append(@"
                        <html>
                            <head>
                            </head>
                            <body>
                                <div class='header'><h1>This is the generated PDF report!!!</h1></div>
                                <table align='center'>
                                    <tr>
                                        <th>Name</th>
                                        <th>LastName</th>
                                        <th>Age</th>
                                        <th>Gender</th>
                                    </tr>");

            foreach (var emp in employees)
            {
                sb.AppendFormat(@"<tr>
                                    <td>{0}</td>
                                    <td>{1}</td>
                                    <td>{2}</td>
                                    <td>{3}</td>
                                  </tr>", emp.Name, emp.LastName, emp.Age, emp.Gender);
            }
            sb.Append(@"
                                </table>
                            </body>
                        </html>");

            return sb.ToString();
        }
    }

若是想要指定css樣式，則能夠建立某些文件夾，隨後在API經過服務器路徑來抉擇配置。app

.header {
    text-align: center;
    color: green;
    padding-bottom: 35px;
}

table {
    width: 80%;
    border-collapse: collapse;
}

td, th {
    border: 1px solid gray;
    padding: 15px;
    font-size: 22px;
    text-align: center;
}

table th {
    background-color: green;
    color: white;
}

　　就是這樣，咱們有用於HTML建立的HTML模板。如今，咱們能夠繼續執行Controller邏輯。函數

 [Route("api/PdfCreator")]
    [ApiController]
    public class PdfCreatorController : ControllerBase
    {
        private IConverter _converter;

        public PdfCreatorController(IConverter converter)
        {
            _converter = converter;
        }

        [HttpGet]
        public IActionResult CreatePDF()
        {
            var globalSettings = new GlobalSettings
            {
                ColorMode = ColorMode.Color,
                Orientation = Orientation.Portrait,
                PaperSize = PaperKind.A4,
                Margins = new MarginSettings { Top = 10 },
                DocumentTitle = "PDF Report"
            };

            var objectSettings = new ObjectSettings
            {
                PagesCount = true,
                HtmlContent = TempleGenertor.GetHTMLString(),
                WebSettings = { DefaultEncoding = "utf-8", UserStyleSheet = Path.Combine(Directory.GetCurrentDirectory(), "assets", "style.css") },
                HeaderSettings = { FontName = "Arial", FontSize = 9, Right = "Page [page] of [toPage]", Line = true },
                FooterSettings = { FontName = "Arial", FontSize = 9, Line = true, Center = "Report Footer" }
            };

            var pdf = new HtmlToPdfDocument()
            {
                GlobalSettings = globalSettings,
                Objects = { objectSettings }
            };

            var file = _converter.Convert(pdf);
            return File(file, "application/pdf");
        }
    }