ASP.NET中可编码设计的图文结构化文档打印方案咨询

Hey there! Since you're coming from WPF's FlowDocument and need an ASP.NET alternative for building and printing structured docs with images and text, here are the most practical, battle-tested options I recommend:

This is the go-to for most ASP.NET projects because it leverages the browser's built-in printing capabilities, and HTML makes structuring text + images straightforward—just like how FlowDocument works for WPF, but web-native.

Here's a quick example using Razor Views (works for both ASP.NET Core and Framework):

@{
    ViewData["Title"] = "Structured Document";
}

<div class="printable-document">
    <h1>Project Proposal: XYZ</h1>
    <p>Submitted by: @User.Identity.Name</p>
    
    <h3>Executive Summary</h3>
    <p>This document outlines the scope and deliverables for the XYZ project, including key milestones and resource requirements.</p>
    
    <img src="@Url.Content("~/images/project-milestone-chart.png")" alt="Project Milestone Chart" class="document-image" />
    
    <h3>Detailed Breakdown</h3>
    <ul>
        <li>Phase 1: Requirements Gathering (Weeks 1-2)</li>
        <li>Phase 2: Development (Weeks 3-8)</li>
        <li>Phase 3: Testing & Deployment (Weeks 9-10)</li>
    </ul>
</div>

<button onclick="window.print()" class="print-btn">Print Document</button>

<style>
    /* Base styles for screen */
    .printable-document {
        width: 210mm;
        margin: 2rem auto;
        padding: 15mm;
        border: 1px solid #eee;
        font-family: 'Segoe UI', sans-serif;
    }
    .document-image {
        max-width: 100%;
        height: auto;
        margin: 1.5rem 0;
    }
    .print-btn {
        display: block;
        margin: 0 auto;
        padding: 0.5rem 1.5rem;
        cursor: pointer;
    }

    /* Print-specific styles */
    @media print {
        body * {
            visibility: hidden; /* Hide everything except the document */
        }
        .printable-document, .printable-document * {
            visibility: visible;
        }
        .printable-document {
            position: absolute;
            left: 0;
            top: 0;
            border: none;
            margin: 0;
            padding: 0;
        }
        .print-btn {
            display: none; /* Hide print button when printing */
        }
    }
</style>

• Pros: No extra libraries needed, fast to implement, full control over styling with CSS, supports browser print features like paper size selection and scaling.
• Cons: Print layout depends on browser settings, so consistency across different browsers might vary slightly (but CSS media queries help mitigate this).

If you need a document that looks identical across all devices and can be saved/printed, PDF is the way to go. iText7 is the modern, widely-used library for creating PDFs in .NET.

Here's a sample ASP.NET Core controller method to generate a PDF with text and images:

using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.IO.Image;
using System.IO;

public IActionResult GenerateStructuredPdf()
{
    using var memoryStream = new MemoryStream();
    var pdfWriter = new PdfWriter(memoryStream);
    var pdfDocument = new PdfDocument(pdfWriter);
    var document = new Document(pdfDocument);

    // Add title
    document.Add(new Paragraph("Structured Project Document")
        .SetFontSize(22)
        .SetBold()
        .SetTextAlignment(iText.Layout.Properties.TextAlignment.CENTER)
        .SetMarginBottom(20));

    // Add paragraph text
    document.Add(new Paragraph("This is a structured document with both text content and embedded images, generated using iText7 in ASP.NET Core.")
        .SetMarginBottom(15));

    // Add image
    var imagePath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", "images", "sample-image.jpg");
    var imageData = ImageDataFactory.Create(imagePath);
    var image = new Image(imageData)
        .SetWidthPercent(90)
        .SetTextAlignment(iText.Layout.Properties.TextAlignment.CENTER)
        .SetMarginBottom(15);
    document.Add(image);

    // Add bulleted list
    var list = new List()
        .SetSymbolIndent(10)
        .SetMarginLeft(20);
    list.Add(new ListItem("First section of structured content"));
    list.Add(new ListItem("Second section with supporting details"));
    list.Add(new ListItem("Third section with embedded media"));
    document.Add(list);

    document.Close();
    memoryStream.Position = 0;

    // Return PDF to browser (user can print or save)
    return File(memoryStream, "application/pdf", "Structured-Document.pdf");
}

• Pros: Pixel-perfect layout consistency, supports advanced features like headers/footers, page numbering, and encryption.
• Cons: Requires adding a third-party library, and you'll need to learn iText's API for complex layouts. Note that iText7 has both AGPL open-source and commercial licensing options—make sure to pick the one that fits your project.

If you're working with legacy ASP.NET Framework, Microsoft's ReportViewer control is an official alternative to FlowDocument. It lets you design visual reports (with text, images, and data binding) using RDLC files, then embed them in your ASP.NET page for printing.

• How it works: Create an RDLC report file using Visual Studio's report designer, add text boxes, image controls, and bind data if needed. Then add the ReportViewer control to your ASP.NET page, point it to the RDLC file, and use its built-in print functionality.
• Pros: Visual drag-and-drop designer, excellent for dynamic data-driven documents, official Microsoft support for .NET Framework.
• Cons: Not supported in ASP.NET Core (you'd need third-party RDLC tools for Core), has a steeper learning curve for complex reports.

Pick the option that aligns with your project's stack and requirements:

• For quick, simple structured docs: HTML + browser print.
• For consistent, shareable documents: iText7 PDF generation.
• For data-driven reports on .NET Framework: ReportViewer.

内容的提问来源于stack exchange，提问作者JohnCenna