使用Razor页面自定义网页模板, 后台根据不同数据动态生成网页内容，利用itext7.pdfhtml导出pdf文件

一、自定义网页模板

 这是一个cshtml后缀的文件，通过该文件定义要导出到pdf或者word的内容模板。

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>订单页面模板</title>
    <style>
        .byTable {
            width: 100%;
            border-collapse: collapse;
            padding: 2px;
        }

            .byTable, .byTable tr th, .byTable tr td {
                border: 1px solid black;
                padding: 5px 15px;
                font-size: 16px;
            }
    </style>
</head>
<body>
    <p>RazorEngine!</p>
    <h3>Order Name: @Model.OrderName</h3>
    <h3>Order #: @Model.OrderNo</h3>

    @if (Model.OrderName == "order name")
    {
        <span>PM: @Model.OrderName</span>
    }
    else
    {
        <p>PM: @Model.OrderName</p>
    }

    <h3>订单详情</h3>
    <table class="byTable">
        <tr>
            <td>Item name</td>
            <td>Item #</td>
            <td>Quantity</td>
            <td>Price</td>
            <td>Total</td>
        </tr>
        @foreach (var item in Model.Items)
        {
            <tr>
                <td>@item.ItemName</td>
                <td>@item.ItemNo</td>
                <td>@item.Quantity</td>
                <td>@item.Price</td>
                <td>@item.Total</td>
            </tr>
        }
    </table>
</body>
</html>

二、通过模板解析器解析自定义的网页模板，动态填充数据

网页模板解析器使用RazorEngine进行解析，通过NuGet添加RazorEngine和itext7.pdfhtml，然后运行RunCompile结合Model填充网页模板。代码如下

using RazorEngine;
using RazorEngine.Templating;
using System;
using System.IO;
using System.Text;
using System.Web;

namespace HY.MvcWeb.Models
{
    public class RazorTemplateParser
    {
        public string Parse<T>(string templateContents, T data)
        {
            return HttpUtility.HtmlDecode(ParseTemplate(templateContents, data));
        }

        private string ParseTemplate<T>(string templateContents, T data)
        {
            try
            {
                var templateKey = new NameOnlyTemplateKey(templateContents.GetHashCode().ToString(), ResolveType.Global, null);

                if (!Engine.Razor.IsTemplateCached(templateKey, data.GetType()))
                {
                    Engine.Razor.AddTemplate(templateKey, new LoadedTemplateSource(templateContents));
                }

                var templateOutput = new StringBuilder();
                using (var sw = new StringWriter(templateOutput))
                {
                    Engine.Razor.RunCompile(templateKey, sw, data.GetType(), data);
                }

                return templateOutput.ToString();
            }
            catch (Exception ex)
            {
                throw new Exception("There was an error parsing this page.", ex);
            }
        }
    }
}

通过如下代码，提取网页模板内容，填充数据，并调用导出pdf的代码在目标文件夹生成pdf文件：

public void ExportPdf()
        {
            var path = AppDomain.CurrentDomain.BaseDirectory + "Templates\\WebPage1.cshtml";
            var template = System.IO.File.ReadAllText(path);

            var model = new Order
            {
                OrderName = "order name",
                OrderNo = "order no",
                OrderDate = DateTime.Now,
                OrderStatus = "in progress",
                Items = new List<OrderItem> {
                    new OrderItem
                    {
                        ItemName = "item name 1",
                        ItemNo="item no 1",
                        Price = 10,
                        Quantity =20
                    },
                    new OrderItem
                    {
                        ItemName = "item name 2",
                        ItemNo="item no 2",
                        Price = 15,
                        Quantity =10
                    }
                }
            };

            var razorParsed = new RazorTemplateParser().Parse(template, model);
            var pdfFilePath = AppDomain.CurrentDomain.BaseDirectory + "Output\\Exported.pdf";
            ConvertHtmlStringToPdf(razorParsed, pdfFilePath);
        }

        private void ConvertHtmlStringToPdf(string htmlString, string pdfFilePath)
        {
            using (FileStream pdfDest = System.IO.File.Open(pdfFilePath, FileMode.OpenOrCreate))
            {
                ConverterProperties converterProperties = new ConverterProperties();
                HtmlConverter.ConvertToPdf(htmlString, pdfDest, converterProperties);
            }
        }

Order 类的定义如下：

namespace HY.MvcWeb.Models
{
    public class Order
    {
        public string OrderName { get; set; }
        public string OrderNo { get; set; }
        public DateTime OrderDate { get; set; }
        public string OrderStatus { get; set; }
        public List<OrderItem> Items { get; set; }
    }

    public class OrderItem
    {
        public string ItemName { get; set; }
        public string ItemNo { get; set; }
        public double Price { get; set; }
        public int Quantity { get; set; }
        public double Total { get { return Quantity * Price; } }
    }
}

 

如下是生成的pdf内容截图：

 

posted @ 2021-09-15 15:21  SilverFox8588  阅读(291)  评论(0)  编辑  收藏  举报