IronPDF Blazor Server 教學：使用 C# 將 HTML 渲染為 PDF

@page "/IronPdf"
@inject IJSRuntime JS

<h3>IronPdfComponent</h3>

<EditForm Model="@_InputMsgModel" id="inputText">
  <div>
    <InputTextArea @bind-Value="@_InputMsgModel.HTML" rows="20" />
  </div>
  <div>
    <button type="button" @onclick="@SubmitHTML">Render HTML</button>
  </div>
</EditForm>

@code {

    // Model to bind user input
    private InputHTMLModel _InputMsgModel = new InputHTMLModel();

    private async Task SubmitHTML()
    {
        // Set your IronPDF license key
        IronPdf.License.LicenseKey = "IRONPDF-MYLICENSE-KEY-1EF01";

        // Create a renderer to convert HTML to PDF
        var render = new IronPdf.ChromePdfRenderer();

        // Configure rendering options for better output
        render.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
        render.RenderingOptions.MarginTop = 40;
        render.RenderingOptions.MarginBottom = 40;

        // Render the HTML input into a PDF document
        var doc = render.RenderHtmlAsPdf(_InputMsgModel.HTML);

        var fileName = "iron.pdf";

        // Create a stream reference for the PDF content
        using var streamRef = new DotNetStreamReference(stream: doc.Stream);

        // Invoke JavaScript function to download the PDF in the browser
        await JS.InvokeVoidAsync("SubmitHTML", fileName, streamRef);
    }

    public class InputHTMLModel
    {
        public string HTML { get; set; } = @"<h1>Welcome to IronPDF</h1>
            <p>This is a sample PDF generated from HTML content in Blazor Server.</p>
            <ul>
                <li>Easy to use API</li>
                <li>High-quality rendering</li>
                <li>Full HTML5 and CSS3 support</li>
            </ul>";
    }
}

Imports System.Threading.Tasks
Imports Microsoft.JSInterop
Imports IronPdf

@Code

' Model to bind user input
Private _InputMsgModel As New InputHTMLModel()

Private Async Function SubmitHTML() As Task
    ' Set your IronPDF license key
    IronPdf.License.LicenseKey = "IRONPDF-MYLICENSE-KEY-1EF01"

    ' Create a renderer to convert HTML to PDF
    Dim render = New IronPdf.ChromePdfRenderer()

    ' Configure rendering options for better output
    render.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4
    render.RenderingOptions.MarginTop = 40
    render.RenderingOptions.MarginBottom = 40

    ' Render the HTML input into a PDF document
    Dim doc = render.RenderHtmlAsPdf(_InputMsgModel.HTML)

    Dim fileName = "iron.pdf"

    ' Create a stream reference for the PDF content
    Using streamRef = New DotNetStreamReference(stream:=doc.Stream)
        ' Invoke JavaScript function to download the PDF in the browser
        Await JS.InvokeVoidAsync("SubmitHTML", fileName, streamRef)
    End Using
End Function

Public Class InputHTMLModel
    Public Property HTML As String = "<h1>Welcome to IronPDF</h1>
        <p>This is a sample PDF generated from HTML content in Blazor Server.</p>
        <ul>
            <li>Easy to use API</li>
            <li>High-quality rendering</li>
            <li>Full HTML5 and CSS3 support</li>
        </ul>"
End Class

<script>
    // JavaScript function to download PDFs generated by IronPdf
    window.SubmitHTML = async (fileName, contentStreamReference) => {
        // Get the PDF content as an ArrayBuffer
        const arrayBuffer = await contentStreamReference.arrayBuffer();

        // Create a Blob from the ArrayBuffer
        const blob = new Blob([arrayBuffer]);

        // Create an object URL for the Blob
        const url = URL.createObjectURL(blob);

        // Create an anchor element to initiate the download
        const anchorElement = document.createElement("a");
        anchorElement.href = url;
        anchorElement.download = fileName ?? "download.pdf";

        // Programmatically click the anchor to start the download
        anchorElement.click();

        // Clean up by removing the anchor and revoking the object URL
        anchorElement.remove();
        URL.revokeObjectURL(url);
    };
</script>

<div class="nav-item px-3">
    <NavLink class="nav-link" href="IronPdf">
        <span class="oi oi-list-rich" aria-hidden="true"></span> IronPdf
    </NavLink>
</div>