使用 IronPDF 在 C# 和 .NET 中進行 PDF編輯：轉換 PDF 頁面

using IronPdf;
using System;

// Load an existing PDF or create a new one
PdfDocument pdf = PdfDocument.FromFile("invoice.pdf");

// Apply different transformations to multiple pages
for (int i = 0; i < pdf.Pages.Count; i++)
{
    if (i % 2 == 0)
    {
        // Even pages: Create margin space and reduce size slightly
        pdf.Pages[i].Transform(30, 30, 0.9, 0.9);
    }
    else
    {
        // Odd pages: Center content with larger margins
        pdf.Pages[i].Transform(40, 60, 0.85, 0.85);
    }
}

// Save the transformed document
pdf.SaveAs("invoice_transformed.pdf");

// You can also export to memory stream for web applications
var memoryStream = pdf.Stream;

Imports IronPdf
Imports System

' Load an existing PDF or create a new one
Dim pdf As PdfDocument = PdfDocument.FromFile("invoice.pdf")

' Apply different transformations to multiple pages
For i As Integer = 0 To pdf.Pages.Count - 1
    If i Mod 2 = 0 Then
        ' Even pages: Create margin space and reduce size slightly
        pdf.Pages(i).Transform(30, 30, 0.9, 0.9)
    Else
        ' Odd pages: Center content with larger margins
        pdf.Pages(i).Transform(40, 60, 0.85, 0.85)
    End If
Next

' Save the transformed document
pdf.SaveAs("invoice_transformed.pdf")

' You can also export to memory stream for web applications
Dim memoryStream = pdf.Stream

using IronPdf;
using System.Linq;
using System.Threading.Tasks;

public async Task TransformLargeDocument(string filePath)
{
    PdfDocument pdf = PdfDocument.FromFile(filePath);

    // Process pages in parallel for better performance
    var tasks = pdf.Pages.Select((page, index) => 
        Task.Run(() => 
        {
            // Apply consistent transformation to all pages
            page.Transform(25, 25, 0.95, 0.95);
        })
    ).ToArray();

    await Task.WhenAll(tasks);

    // Save with optimized settings
    pdf.SaveAs("transformed_optimized.pdf");
}

Imports IronPdf
Imports System.Linq
Imports System.Threading.Tasks

Public Async Function TransformLargeDocument(filePath As String) As Task
    Dim pdf As PdfDocument = PdfDocument.FromFile(filePath)

    ' Process pages in parallel for better performance
    Dim tasks = pdf.Pages.Select(Function(page, index) _
        Task.Run(Sub()
                     ' Apply consistent transformation to all pages
                     page.Transform(25, 25, 0.95, 0.95)
                 End Sub)
    ).ToArray()

    Await Task.WhenAll(tasks)

    ' Save with optimized settings
    pdf.SaveAs("transformed_optimized.pdf")
End Function

// Create thumbnail-sized versions of pages
pdf.Pages[0].Transform(10, 10, 0.3, 0.3);

' Create thumbnail-sized versions of pages
pdf.Pages(0).Transform(10, 10, 0.3, 0.3)

// Add 0.5 inch (36 points) binding margin on left
pdf.Pages[0].Transform(36, 0, 1.0, 1.0);

' Add 0.5 inch (36 points) binding margin on left
pdf.Pages(0).Transform(36, 0, 1.0, 1.0)

// Calculate centering offset (assuming standard letter size)
double pageWidth = 612; // points
double contentWidth = 500; // estimated content width
double centerOffset = (pageWidth - contentWidth) / 2;

pdf.Pages[0].Transform(centerOffset, 50, 1.0, 1.0);

' Calculate centering offset (assuming standard letter size)
Dim pageWidth As Double = 612 ' points
Dim contentWidth As Double = 500 ' estimated content width
Dim centerOffset As Double = (pageWidth - contentWidth) / 2

pdf.Pages(0).Transform(centerOffset, 50, 1.0, 1.0)