MemoryStream 到 PDF C

using IronPdf;
using System.IO;
using System.Net.Http;

// Example 1: From FileStream
using (FileStream fileStream = File.OpenRead("document.pdf"))
{
    var pdfFromFileStream = new PdfDocument(fileStream);
}

// Example 2: From MemoryStream
byte[] pdfBytes = GetPdfBytesFromDatabase(); // Your method to get PDF bytes
using (MemoryStream memoryStream = new MemoryStream(pdfBytes))
{
    var pdfFromMemoryStream = new PdfDocument(memoryStream);
}

// Example 3: From HTTP Response
using (HttpClient client = new HttpClient())
{
    byte[] pdfData = await client.GetByteArrayAsync("https://example.com/document.pdf");
    var pdfFromHttp = new PdfDocument(pdfData);
}

Imports IronPdf
Imports System.IO
Imports System.Net.Http

' Example 1: From FileStream
Using fileStream As FileStream = File.OpenRead("document.pdf")
    Dim pdfFromFileStream = New PdfDocument(fileStream)
End Using

' Example 2: From MemoryStream
Dim pdfBytes As Byte() = GetPdfBytesFromDatabase() ' Your method to get PDF bytes
Using memoryStream As New MemoryStream(pdfBytes)
    Dim pdfFromMemoryStream = New PdfDocument(memoryStream)
End Using

' Example 3: From HTTP Response
Using client As New HttpClient()
    Dim pdfData As Byte() = Await client.GetByteArrayAsync("https://example.com/document.pdf")
    Dim pdfFromHttp = New PdfDocument(pdfData)
End Using

using IronPdf;
using System.Collections.Generic;
using System.IO;

public static byte[] MergePdfsFromMemory(List<byte[]> pdfBytesList)
{
    List<PdfDocument> pdfs = new List<PdfDocument>();

    // Load all PDFs from byte arrays
    foreach (var pdfBytes in pdfBytesList)
    {
        pdfs.Add(new PdfDocument(pdfBytes));
    }

    // Merge PDFs
    PdfDocument merged = PdfDocument.Merge(pdfs);

    // Export merged PDF to byte array
    using (MemoryStream ms = new MemoryStream())
    {
        merged.SaveAs(ms);
        return ms.ToArray();
    }
}

Imports IronPdf
Imports System.Collections.Generic
Imports System.IO

Public Shared Function MergePdfsFromMemory(pdfBytesList As List(Of Byte())) As Byte()
    Dim pdfs As New List(Of PdfDocument)()

    ' Load all PDFs from byte arrays
    For Each pdfBytes In pdfBytesList
        pdfs.Add(New PdfDocument(pdfBytes))
    Next

    ' Merge PDFs
    Dim merged As PdfDocument = PdfDocument.Merge(pdfs)

    ' Export merged PDF to byte array
    Using ms As New MemoryStream()
        merged.SaveAs(ms)
        Return ms.ToArray()
    End Using
End Function

using IronPdf;
using System.IO;

// Load PDF from memory
byte[] unsecuredPdfBytes = GetPdfFromDatabase();
PdfDocument pdf = new PdfDocument(unsecuredPdfBytes);

// Apply security settings
pdf.SecuritySettings.UserPassword = "user123";
pdf.SecuritySettings.OwnerPassword = "owner456";
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.NoPrint;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;

// Export secured PDF to memory
byte[] securedPdfBytes = pdf.BinaryData;
// Store or transmit secured PDF bytes

Imports IronPdf
Imports System.IO

' Load PDF from memory
Dim unsecuredPdfBytes As Byte() = GetPdfFromDatabase()
Dim pdf As New PdfDocument(unsecuredPdfBytes)

' Apply security settings
pdf.SecuritySettings.UserPassword = "user123"
pdf.SecuritySettings.OwnerPassword = "owner456"
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.NoPrint
pdf.SecuritySettings.AllowUserCopyPasteContent = False

' Export secured PDF to memory
Dim securedPdfBytes As Byte() = pdf.BinaryData
' Store or transmit secured PDF bytes