如何使用异步和多线程生成 PDF
This article was translated from English: Does it need improvement?
TranslatedView the article in English
异步和线程在生成以下内容时非常有用使用 IronPDF for .NET 在 C# 和 VB.NET 中创建高性能 PDF 文件在翻译过程中,您可以分批或优化性能。
开始使用IronPDF
立即在您的项目中开始使用IronPDF,并享受免费试用。
如何使用异步和多线程生成 PDF
异步示例
IronPDF完全支持异步操作,使用其异步渲染方法,例如RenderHtmlAsPdfAsync
方法。
:path=/static-assets/pdf/content-code-examples/how-to/async-async.cs
using IronPdf;
using System.Threading.Tasks;
// Instantiate ChromePdfRenderer
ChromePdfRenderer renderer = new ChromePdfRenderer();
string[] htmlStrings = {"<h1>Html 1</h1>", "<h1>Html 2</h1>", "<h1>Html 3</h1>"};
// Create an array to store the tasks for rendering
var renderingTasks = new Task<PdfDocument>[htmlStrings.Length];
for (int i = 0; i < htmlStrings.Length; i++)
{
int index = i; // Capturing the loop variable
renderingTasks[i] = Task.Run(async () =>
{
// Render HTML to PDF
return await renderer.RenderHtmlAsPdfAsync(htmlStrings[index]);
});
}
// Wait for all rendering tasks to complete
// await Task.WhenAll(renderingTasks);
Imports IronPdf
Imports System.Threading.Tasks
' Instantiate ChromePdfRenderer
Private renderer As New ChromePdfRenderer()
Private htmlStrings() As String = {"<h1>Html 1</h1>", "<h1>Html 2</h1>", "<h1>Html 3</h1>"}
' Create an array to store the tasks for rendering
Private renderingTasks = New Task(Of PdfDocument)(htmlStrings.Length - 1){}
For i As Integer = 0 To htmlStrings.Length - 1
Dim index As Integer = i ' Capturing the loop variable
renderingTasks(i) = Task.Run(Async Function()
' Render HTML to PDF
Return Await renderer.RenderHtmlAsPdfAsync(htmlStrings(index))
End Function)
Next i
' Wait for all rendering tasks to complete
' await Task.WhenAll(renderingTasks);
VB C#
多线程示例
IronPDF 是线程安全的,并且在使用 IronPdf.ChromePdfRenderer 渲染引擎时支持多线程。
一个限制是在 macOS 机器上多线程受到限制。
我们发现Parallel.ForEach
模式在批量处理PDFs时非常有帮助。
:path=/static-assets/pdf/content-code-examples/how-to/async-multi-thread.cs
using IronPdf;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Threading.Tasks;
var queue = new List<string>() { "<h1>Html 1</h1>", "<h1>Html 2</h1>", "<h1>Html 3</h1>" };
// Instantiate ChromePdfRenderer
ChromePdfRenderer renderer = new ChromePdfRenderer();
// Create a list to store the rendered PDFs
List<PdfDocument> pdfResults = new List<PdfDocument>();
Parallel.ForEach(queue, html =>
{
// Render HTML to PDF
PdfDocument pdf = renderer.RenderHtmlAsPdf(html);
// You may choose to save the PDF to disk here if needed
// For this example, we'll store it in the pdfResults list
lock (pdfResults)
{
pdfResults.Add(pdf);
}
});
Imports IronPdf
Imports System.Collections.Concurrent
Imports System.Collections.Generic
Imports System.Threading.Tasks
Private queue = New List(Of String)() From {"<h1>Html 1</h1>", "<h1>Html 2</h1>", "<h1>Html 3</h1>"}
' Instantiate ChromePdfRenderer
Private renderer As New ChromePdfRenderer()
' Create a list to store the rendered PDFs
Private pdfResults As New List(Of PdfDocument)()
Parallel.ForEach(queue, Sub(html)
' Render HTML to PDF
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(html)
' You may choose to save the PDF to disk here if needed
' For this example, we'll store it in the pdfResults list
SyncLock pdfResults
pdfResults.Add(pdf)
End SyncLock
End Sub)
VB C#
性能比较
让我们进行比较。 我还增加了渲染时的5秒延迟。用于模拟复杂 HTML 渲染的 WaitFor 类. 以下是上述各种技术性能的比较表。
正常渲染 | 异步渲染 | 多线程渲染 |
---|---|---|
5.75 秒 | 5.59 秒 | 5.68 秒 |