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用 QuestPDF操作生成PDF更快更高效！

2022-07-26 19:18:00 【biyusr】

QuestPDF

QuestPDF是一个开源的工具库，可以在.NET或者.Net Core中生成pdf文档

它提供了一个布局引擎，设计时考虑到了完整的分页支持以及灵活性要求！比市面上常见的Aspose和iTextSharp好用太多了！GitHub地址

安装

Install-Package QuestPDF

例子

简单例子

生成Pdf文档一共分为三部分，Header(页眉)，Content（内容）,Footer（页脚）

Document.Create(container =>
{
    container.Page(page =>
    {
        page.Size(PageSizes.A4);
        page.Margin(2, Unit.Centimetre);
        page.Background(Colors.White);
        page.DefaultTextStyle(x => x.FontSize(20));
        
        page.Header()
            .Text("Hello PDF!")
            .SemiBold().FontSize(36).FontColor(Colors.Blue.Medium);
        
        page.Content()
            .PaddingVertical(1, Unit.Centimetre)
            .Column(x =>
            {
                x.Spacing(20);
                
                x.Item().Text(Placeholders.LoremIpsum());
                x.Item().Image(Placeholders.Image(200, 100));
            });
        
        page.Footer()
            .AlignCenter()
            .Text(x =>
            {
                x.Span("Page ");
                x.CurrentPageNumber();
            });
    });
})
.GeneratePdf("hello.pdf");

模板生成

使用模板生成一共设计三个应用层的工作:

文档Model(一组描述 PDF 文档内容的类)
数据源(将域实体映射到文档模型的层)
模板(描述如何可视化信息并将其转换为 PDF 文件的表示层)

比如我们设计一个基本的发票信息要设计一个购物清单，一个卖家买家的地址，以及发票编号等等我们设计这样的3个Model类

   public class InvoiceModel
    {
        public int InvoiceNumber { get; set; }
        public DateTime IssueDate { get; set; }
        public DateTime DueDate { get; set; }

        public Address SellerAddress { get; set; }
        public Address CustomerAddress { get; set; }

        public List<OrderItem> Items { get; set; }
        public string Comments { get; set; }
    }

    public class OrderItem
    {
        public string Name { get; set; }
        public decimal Price { get; set; }
        public int Quantity { get; set; }
    }

    public class Address
    {
        public string CompanyName { get; set; }
        public string Street { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public object Email { get; set; }
        public string Phone { get; set; }
    }

Model定义好了之后我们就定义一些假数据来填充pdf

 public static class InvoiceDocumentDataSource
    {
        private static Random Random = new Random();

        public static InvoiceModel GetInvoiceDetails()
        {
            var items = Enumerable
                .Range(1, 8)
                .Select(i => GenerateRandomOrderItem())
                .ToList();

            return new InvoiceModel
            {
                InvoiceNumber = Random.Next(1_000, 10_000),
                IssueDate = DateTime.Now,
                DueDate = DateTime.Now + TimeSpan.FromDays(14),

                SellerAddress = GenerateRandomAddress(),
                CustomerAddress = GenerateRandomAddress(),

                Items = items,
                Comments ="测试备注"
            };
        }

        private static OrderItem GenerateRandomOrderItem()
        {
            return new OrderItem
            {
                Name = "商品",
                Price = (decimal)Math.Round(Random.NextDouble() * 100, 2),
                Quantity = Random.Next(1, 10)
            };
        }

        private static Address GenerateRandomAddress()
        {
            return new Address
            {
                CompanyName = "测试商店",
                Street = "测试街道",
                City = "测试城市",
                State = "测试状态",
                Email = "测试邮件",
                Phone = "测试电话"
            };
        }
    }

然后搭建我们的模板脚手架我们要使用模板脚手架,就要定义一个实现IDocument接口的新类开始。该接口包含两个方法

DocumentMetadata GetMetadata();
void Compose(IDocumentContainer container);

第一个是模板文档的一些基础信息第二个是模板的容器基于这些原则我们设计一个模板层类

 public class InvoiceDocument : IDocument
    {
        public InvoiceModel Model { get; }

        public InvoiceDocument(InvoiceModel model)
        {
            Model = model;
        }

        public DocumentMetadata GetMetadata() => DocumentMetadata.Default;

        public void Compose(IDocumentContainer container)
        {
            container
                .Page(page =>
                {
                    page.PageColor(Colors.Red.Lighten1);
                    page.Size(PageSizes.A4);
                    page.Margin(10);//外边距

      
                    page.Header().Height(100).Background(Colors.LightBlue.Lighten1);
                    page.Content().Background(Colors.Grey.Lighten3);
                    page.Footer().Height(50).Background(Colors.Grey.Lighten1);
                });
        }
}

pdf的page页面总是有三个元素:页眉,页脚，内容。查看一下我们生成的文档

到目前为止，我们已经搭建了一个非常简单的页面，其中每个部分都有不同的颜色或大小

接下来我们来填充他的页眉,我们把数据源整理好了之后，就可以调用Element方法填充

 public void Compose(IDocumentContainer container)
        {
            container
                .Page(page =>
                {
                    page.PageColor(Colors.Red.Lighten1);
                    page.Size(PageSizes.A4);
                    page.Margin(10);//外边距

      
                    page.Header().Height(100).Background(Colors.LightBlue.Lighten1).Element(ComposeHeader);
                    page.Content().Background(Colors.Grey.Lighten3);
                    page.Footer().Height(50).Background(Colors.Grey.Lighten1);
                });
        }


        void ComposeHeader(IContainer container)
        {
            var titleStyle = TextStyle.Default.FontSize(20).SemiBold().FontColor(Colors.Blue.Medium);

            container.Row(row =>
            {
                row.RelativeItem().Column(column =>
                {
                    column.Item().Text($"发票 #{Model.InvoiceNumber}").FontFamily("simhei").Style(titleStyle);

                    column.Item().Text(text =>
                    {
                        text.Span("发行日期: ").SemiBold().FontFamily("simhei");
                        text.Span($"{Model.IssueDate:d}").FontFamily("simhei");
                    });

                    column.Item().Text(text =>
                    {
                        text.Span("支付日期: ").FontFamily("simhei").SemiBold();
                        text.Span($"{Model.DueDate:d}").FontFamily("simhei");
                    });

                })
                ;

            });
        }

最后我们来实现内容，

  public void Compose(IDocumentContainer container)
        {
            container
                .Page(page =>
                {
                    page.PageColor(Colors.Red.Lighten1);
                    page.Size(PageSizes.A4);
                    page.Margin(10);//外边距

      
                    page.Header().Height(100).Background(Colors.LightBlue.Lighten1).Element(ComposeHeader);
                    page.Content().Background(Colors.Grey.Lighten3).Element(ComposeContent);
                    page.Footer().Height(50).Background(Colors.Grey.Lighten1);
                });
        }


        void ComposeHeader(IContainer container)
        {
            var titleStyle = TextStyle.Default.FontSize(20).SemiBold().FontColor(Colors.Blue.Medium);

            container.Row(row =>
            {
                row.RelativeItem().Column(column =>
                {
                    column.Item().Text($"发票 #{Model.InvoiceNumber}").FontFamily("simhei").Style(titleStyle);

                    column.Item().Text(text =>
                    {
                        text.Span("发行日期: ").SemiBold().FontFamily("simhei");
                        text.Span($"{Model.IssueDate:d}").FontFamily("simhei");
                    });

                    column.Item().Text(text =>
                    {
                        text.Span("支付日期: ").FontFamily("simhei").SemiBold();
                        text.Span($"{Model.DueDate:d}").FontFamily("simhei");
                    });

                })
                ;

            });
        }

        void ComposeContent(IContainer container)
        {
            container.Table(table =>
            {
                // step 1
                table.ColumnsDefinition(columns =>
                {
                    columns.ConstantColumn(25);
                    columns.RelativeColumn(3);
                    columns.RelativeColumn();
                    columns.RelativeColumn();
                    columns.RelativeColumn();
                });

                // step 2
                table.Header(header =>
                {
                    header.Cell().Text("#").FontFamily("simhei");
                    header.Cell().Text("商品").FontFamily("simhei");
                    header.Cell().AlignRight().Text("价格").FontFamily("simhei");
                    header.Cell().AlignRight().Text("数量").FontFamily("simhei");
                    header.Cell().AlignRight().Text("总价").FontFamily("simhei");

                    header.Cell().ColumnSpan(5)
                        .PaddingVertical(5).BorderBottom(1).BorderColor(Colors.Black);
                });

                // step 3
                foreach (var item in Model.Items)
                {
                    table.Cell().Element(CellStyle).Text(Model.Items.IndexOf(item) + 1).FontFamily("simhei");
                    table.Cell().Element(CellStyle).Text(item.Name).FontFamily("simhei");
                    table.Cell().Element(CellStyle).AlignRight().Text($"{item.Price}$").FontFamily("simhei");
                    table.Cell().Element(CellStyle).AlignRight().Text(item.Quantity).FontFamily("simhei");
                    table.Cell().Element(CellStyle).AlignRight().Text($"{item.Price * item.Quantity}$").FontFamily("simhei");

                    static IContainer CellStyle(IContainer container)
                    {
                        return container.BorderBottom(1).BorderColor(Colors.Grey.Lighten2).PaddingVertical(5);
                    }
                }
            });

        }

在这些准备工作做完了之后我们就可以生成Pdf文档了

     var filePath = "invoice.pdf";

            var model = InvoiceDocumentDataSource.GetInvoiceDetails();
            var document = new InvoiceDocument(model);
            document.GeneratePdf(filePath);