在C#中生成PDF的步骤详解

dotnet new console -o PdfGeneration

# 对于 Windows 平台：
dotnet add package DotNetBrowser

# 对于其他平台：
dotnet add package DotNetBrowser.Linux-x64
dotnet add package DotNetBrowser.Linux-arm64
dotnet add package DotNetBrowser.macOS-x64
dotnet add package DotNetBrowser.macOS-arm64

class Program
{
    private static async Task Main()
    {
        var options = new EngineOptions.Builder
        {
            RenderingMode = RenderingMode.OffScreen,
            LicenseKey = "您的许可证密钥"
        }.Build();

        using var engine = EngineFactory.Create(engineOptions);
        using var browser = engine.CreateBrowser();

        // 页面是项目中的一个资源。
        var pageUrl = Path.GetFullPath("template.html");   
        await browser.Navigation.LoadUrl(pageUrl);
    }
}

private static void FillInData(IBrowser browser)
{
    var accountNumber = "123-4567";
    var name = "李白";
    var address = "1640 河滨大道";
    var reportingPeriod = "1985 年 10 月 25 日至 11 月 25 日";
    browser.MainFrame.ExecuteJavaScript(
        $"setBillInfo('{accountNumber}', '{name}', '{address}', '{reportingPeriod}')"
    );

    var dayCost = 500; // 美元。
    var dayUsage = 1.21; // 吉瓦特。
    var nightCost = 312;
    var nightUsage = 88;

    browser.MainFrame.ExecuteJavaScript(
        $"addCharge('Day Tariff', {dayUsage}, {dayCost});" +
        $"addCharge('Night Tariff', {nightUsage}, {nightCost});"
    );
}

private static TaskCompletionSource<string> ConfigurePrinting(IBrowser browser)
{
    // 指示浏览器自动打印，而不是显示打印预览。
    browser.RequestPrintHandler = 
        new Handler<RequestPrintParameters, RequestPrintResponse>(
            p => RequestPrintResponse.Print()
        );

    TaskCompletionSource<string> whenCompleted = new();
    // 当浏览器打印 HTML 页面时。
    browser.PrintHtmlContentHandler = 
        new Handler<PrintHtmlContentParameters, PrintHtmlContentResponse>(
            parameters =>
            {
                // 使用 PDF 打印机。
                var printer = parameters.Printers.Pdf;
                var job = printer.PrintJob;
    
                // 为 PDF 文件生成随机名称。
                var guid = Guid.NewGuid().ToString();
                var path = Path.GetFullPath($"{guid}.pdf");
                job.Settings.PdfFilePath = path;
    
                // 去除边缘的空白区域。
                job.Settings.PageMargins = PageMargins.None;
                // 移除浏览器默认的页眉和页脚。
                job.Settings.PrintingHeaderFooterEnabled = false;
                job.PrintCompleted += (_, _) => whenCompleted.SetResult(path);

                // 继续打印。
                return PrintHtmlContentResponse.Print(printer);
            });
    return whenCompleted;
}

private static async Task Main()
{
    var engineOptions = new EngineOptions.Builder
    {
        RenderingMode = RenderingMode.OffScreen,
        LicenseKey = "您的许可证密钥"
    }.Build();

    using var engine = EngineFactory.Create(engineOptions);
    using var browser = engine.CreateBrowser();
    
    await browser.Navigation.LoadUrl(Path.GetFullPath("template.html"));
    
    FillInData(browser);
    var whenPrintCompleted = ConfigurePrinting(browser);
    browser.MainFrame.Print();
    var resultPath = await whenPrintCompleted.Task;
}

dotnet run