IronPDFでBlazor PDFビューアを構築する方法

using IronPdf;

using System.Text.Json;

app.MapPost("/api/reports/generate", async (HttpContext ctx) =>
{
    using var doc = await JsonDocument.ParseAsync(ctx.Request.Body);
    string templateId = doc.RootElement.GetProperty("template").GetString();
    var data = doc.RootElement.GetProperty("data");

    string templateHtml = await File.ReadAllTextAsync($"Templates/{templateId}.html");

    // Populate template with data values via string replacement or templating engine
    string html = templateHtml
        .Replace("{{period}}", data.GetProperty("period").GetString())
        .Replace("{{totalRevenue}}", data.GetProperty("totalRevenue").GetDecimal().ToString("C"))
        .Replace("{{newAccounts}}", data.GetProperty("newAccounts").GetInt32().ToString());

    var renderer = new ChromePdfRenderer();

    renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;

    renderer.RenderingOptions.MarginTop = 20;

    renderer.RenderingOptions.MarginBottom = 20;

    PdfDocument pdf = renderer.RenderHtmlAsPdf(html);

    ctx.Response.ContentType = "application/pdf";

    ctx.Response.Headers["Content-Disposition"] = $"attachment; filename=\"{templateId}-report.pdf\"";

    await ctx.Response.Body.WriteAsync(pdf.BinaryData);

});

Imports IronPdf
Imports System.Text.Json

app.MapPost("/api/reports/generate", Async Function(ctx As HttpContext) As Task
    Using doc = Await JsonDocument.ParseAsync(ctx.Request.Body)
        Dim templateId As String = doc.RootElement.GetProperty("template").GetString()
        Dim data = doc.RootElement.GetProperty("data")

        Dim templateHtml As String = Await File.ReadAllTextAsync($"Templates/{templateId}.html")

        ' Populate template with data values via string replacement or templating engine
        Dim html As String = templateHtml _
            .Replace("{{period}}", data.GetProperty("period").GetString()) _
            .Replace("{{totalRevenue}}", data.GetProperty("totalRevenue").GetDecimal().ToString("C")) _
            .Replace("{{newAccounts}}", data.GetProperty("newAccounts").GetInt32().ToString())

        Dim renderer As New ChromePdfRenderer()

        renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4

        renderer.RenderingOptions.MarginTop = 20

        renderer.RenderingOptions.MarginBottom = 20

        Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(html)

        ctx.Response.ContentType = "application/pdf"

        ctx.Response.Headers("Content-Disposition") = $"attachment; filename=""{templateId}-report.pdf"""

        Await ctx.Response.Body.WriteAsync(pdf.BinaryData)
    End Using
End Function)

using System.Net.Http;
using System.Text;
using System.Text.Json;

var payload = new
{
    template = "monthly-summary",
    data = new { period = "March 2025", totalRevenue = 482300.00, newAccounts = 143 }
};

using var client = new HttpClient { BaseAddress = new Uri("http://pdf-service.internal") };

var content = new StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json");

using var response = await client.PostAsync("/api/reports/generate", content);

response.EnsureSuccessStatusCode();

byte[] pdfBytes = await response.Content.ReadAsByteArrayAsync();

// Stream to browser, save to storage, attach to email, etc.

Imports System.Net.Http
Imports System.Text
Imports System.Text.Json

Dim payload = New With {
    .template = "monthly-summary",
    .data = New With {.period = "March 2025", .totalRevenue = 482300.0, .newAccounts = 143}
}

Using client As New HttpClient With {.BaseAddress = New Uri("http://pdf-service.internal")}
    Dim content As New StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json")

    Using response As HttpResponseMessage = Await client.PostAsync("/api/reports/generate", content)
        response.EnsureSuccessStatusCode()

        Dim pdfBytes As Byte() = Await response.Content.ReadAsByteArrayAsync()

        ' Stream to browser, save to storage, attach to email, etc.
    End Using
End Using