如何使用IronPDF在 C# 中進行 PDF編輯：新增和刪除 PDF 附件

// Get all attachments as a list
var allAttachments = pdf.Attachments.ToList();

// Filter attachments by size (e.g., files larger than 1MB)
var largeAttachments = pdf.Attachments
    .Where(a => a.Data.Length > 1024 * 1024)
    .ToList();

// Find specific attachment by exact name
var specificAttachment = pdf.Attachments
    .FirstOrDefault(a => a.Name == "report.xlsx");

' Get all attachments as a list
Dim allAttachments = pdf.Attachments.ToList()

' Filter attachments by size (e.g., files larger than 1MB)
Dim largeAttachments = pdf.Attachments _
    .Where(Function(a) a.Data.Length > 1024 * 1024) _
    .ToList()

' Find specific attachment by exact name
Dim specificAttachment = pdf.Attachments _
    .FirstOrDefault(Function(a) a.Name = "report.xlsx")

// Filter by file extension (assuming names include extensions)
var imageAttachments = pdf.Attachments
    .Where(a => a.Name.EndsWith(".jpg") || 
                a.Name.EndsWith(".png") || 
                a.Name.EndsWith(".gif"))
    .ToList();

// Filter by name pattern
var reportsOnly = pdf.Attachments
    .Where(a => a.Name.StartsWith("Report_"))
    .ToList();

' Filter by file extension (assuming names include extensions)
Dim imageAttachments = pdf.Attachments _
    .Where(Function(a) a.Name.EndsWith(".jpg") OrElse _
                   a.Name.EndsWith(".png") OrElse _
                   a.Name.EndsWith(".gif")) _
    .ToList()

' Filter by name pattern
Dim reportsOnly = pdf.Attachments _
    .Where(Function(a) a.Name.StartsWith("Report_")) _
    .ToList()

// Remove all attachments that match a pattern
var attachmentsToRemove = pdf.Attachments
    .Where(a => a.Name.StartsWith("temp_"))
    .ToList();

foreach (var attachment in attachmentsToRemove)
{
    pdf.Attachments.RemoveAttachment(attachment);
}

// Or remove all attachments at once
while (pdf.Attachments.Count > 0)
{
    pdf.Attachments.RemoveAttachment(pdf.Attachments.First());
}

Imports System.Linq

' Remove all attachments that match a pattern
Dim attachmentsToRemove = pdf.Attachments _
    .Where(Function(a) a.Name.StartsWith("temp_")) _
    .ToList()

For Each attachment In attachmentsToRemove
    pdf.Attachments.RemoveAttachment(attachment)
Next

' Or remove all attachments at once
While pdf.Attachments.Count > 0
    pdf.Attachments.RemoveAttachment(pdf.Attachments.First())
End While

// Check the attachment count
int attachmentCountBefore = pdf.Attachments.Count;
pdf.Attachments.RemoveAttachment(targetAttachment);
int attachmentCountAfter = pdf.Attachments.Count;

// Verify the count decreased
if (attachmentCountAfter < attachmentCountBefore)
{
    Console.WriteLine("Attachment successfully removed");
}

// Check if specific attachment exists
bool attachmentExists = pdf.Attachments
    .Any(a => a.Name == "specificFile.txt");

' Check the attachment count
Dim attachmentCountBefore As Integer = pdf.Attachments.Count
pdf.Attachments.RemoveAttachment(targetAttachment)
Dim attachmentCountAfter As Integer = pdf.Attachments.Count

' Verify the count decreased
If attachmentCountAfter < attachmentCountBefore Then
    Console.WriteLine("Attachment successfully removed")
End If

' Check if specific attachment exists
Dim attachmentExists As Boolean = pdf.Attachments _
    .Any(Function(a) a.Name = "specificFile.txt")