How to Generate PDFs with Async and Multithreading

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);

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)