更新、删除和获取书签

更新 PDF 文件中的现有书签

为了更新 PDF 文件中的现有书签，您需要使用 ModifyBookmarks 方法。该方法接受两个参数：源标题（要修改的书签的标题）、目标标题（要替换的标题）。您需要创建一个 PdfBookmarkEditor 类的对象，并使用 BindPdf 方法绑定输入的 PDF 文件。之后，您需要调用 ModifyBookmarks 方法，然后使用 Save 方法保存更新后的 PDF。以下代码片段展示了如何在 PDF 文件中修改现有书签。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void UpdateExistingBookmark()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using (var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor())
    {
        // Bind PDF document
        bookmarkEditor.BindPdf(dataDir + "UpdateBookmark.pdf");

        // Modify the existing bookmark, assigning a new title
        bookmarkEditor.ModifyBookmarks("New Bookmark", "New Title");

        // Save PDF document
        bookmarkEditor.Save(dataDir + "UpdateBookmark_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void UpdateExistingBookmark()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor();

    // Bind PDF document
    bookmarkEditor.BindPdf(dataDir + "UpdateBookmark.pdf");

    // Modify the existing bookmark, assigning a new title
    bookmarkEditor.ModifyBookmarks("New Bookmark", "New Title");

    // Save PDF document
    bookmarkEditor.Save(dataDir + "UpdateBookmark_out.pdf");
}

从 PDF 文件中删除所有书签

您可以使用不带任何参数的 DeleteBookmarks 方法删除 PDF 文件中的所有书签。首先，您需要创建一个 PdfBookmarkEditor 类的对象，并使用 BindPdf 方法绑定输入的 PDF 文件。之后，您需要调用 DeleteBookmarks 方法，然后使用 Save 方法保存更新后的 PDF 文件。以下代码片段展示了如何从 PDF 文件中删除所有书签。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void DeleteAllBookmarks()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using (var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor())
    {
        // Bind PDF document
        bookmarkEditor.BindPdf(dataDir + "DeleteAllBookmarks.pdf");

        // Delete all bookmarks in the document
        bookmarkEditor.DeleteBookmarks();

        // Save PDF document
        bookmarkEditor.Save(dataDir + "DeleteAllBookmarks_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void DeleteAllBookmarks()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor();

    // Bind PDF document
    bookmarkEditor.BindPdf(dataDir + "DeleteAllBookmarks.pdf");

    // Delete all bookmarks in the document
    bookmarkEditor.DeleteBookmarks();

    // Save PDF document
    bookmarkEditor.Save(dataDir + "DeleteAllBookmarks_out.pdf");
}

从 PDF 文件中删除特定书签

为了删除特定书签，您需要使用字符串（标题）参数调用 DeleteBookmarks 方法。这里的 title 表示要从 PDF 中删除的书签。创建一个 PdfBookmarkEditor 类的对象，并使用 BindPdf 方法绑定输入的 PDF 文件。之后，调用 DeleteBookmarks 方法，然后使用 Save 方法保存更新后的 PDF 文件。以下代码片段展示了如何从 PDF 文件中删除特定书签。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void DeleteParticularBookmark()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using (var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor())
    {
        // Bind PDF document
        bookmarkEditor.BindPdf(dataDir + "DeleteABookmark.pdf");

        // Delete a bookmark with the title "Page2"
        bookmarkEditor.DeleteBookmarks("Page2");

        // Save PDF document
        bookmarkEditor.Save(dataDir + "DeleteABookmark_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void DeleteParticularBookmark()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor();

   // Bind PDF document
    bookmarkEditor.BindPdf(dataDir + "DeleteABookmark.pdf");

    // Delete a bookmark with the title "Page2"
    bookmarkEditor.DeleteBookmarks("Page2");

    // Save PDF document
    bookmarkEditor.Save(dataDir + "DeleteABookmark_out.pdf");
}

从 PDF 文档 Facades 获取书签

PdfBookmarkEditor 类提供了在现有 PDF 文件中操作书签的功能。它提供了各种属性来获取/设置与书签相关的信息。以下代码片段展示了如何获取与 PDF 文件中每个书签相关的信息。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void GetBookmarksFromDocument()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using (var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor())
    {
        // Bind PDF document
        bookmarkEditor.BindPdf(dataDir + "GetFromPDF.PDF");

        // Extract all bookmarks from the document
        Aspose.Pdf.Facades.Bookmarks bookmarks = bookmarkEditor.ExtractBookmarks();

        // Iterate through each bookmark and display information
        foreach (Aspose.Pdf.Facades.Bookmark bookmark in bookmarks)
        {
            // Get the title information of bookmark item
            Console.WriteLine("Title: {0}", bookmark.Title);

            // Get the destination page for bookmark
            Console.WriteLine("Page Number: {0}", bookmark.PageNumber);

            // Get the information related to associated action with bookmark
            Console.WriteLine("Bookmark Action: " + bookmark.Action);
        }
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void GetBookmarksFromDocument()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor();

    // Bind PDF document
    bookmarkEditor.BindPdf(dataDir + "GetFromPDF.PDF");

    // Extract all bookmarks from the document
    Aspose.Pdf.Facades.Bookmarks bookmarks = bookmarkEditor.ExtractBookmarks();

    // Iterate through each bookmark and display information
    foreach (Aspose.Pdf.Facades.Bookmark bookmark in bookmarks)
    {
        // Get the title information of bookmark item
        Console.WriteLine("Title: {0}", bookmark.Title);

        // Get the destination page for bookmark
        Console.WriteLine("Page Number: {0}", bookmark.PageNumber);

        // Get the information related to associated action with bookmark
        Console.WriteLine("Bookmark Action: " + bookmark.Action);
    }
}

从现有 PDF 文件中提取书签

ExtractBookmarks 方法允许您从 PDF 文件中提取书签。为了提取书签，您需要创建 PdfBookmarkEditor 对象，并使用 BindPdf 方法绑定 PDF 文件。之后，您需要调用 ExtractBookmarks 方法。ExtractBookmarks 方法返回 Bookmarks 对象。然后，您可以遍历这些书签并获取单个 Bookmark 对象。最后，您可以使用 ExportBookmarksToXML 方法将书签导出到 XML 文件。以下代码片段展示了如何将书签导出到 XML 文件。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void ExtractBookmarksFromPDFFile()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using (var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor())
    {
        // Bind PDF document
        bookmarkEditor.BindPdf(dataDir + "ExtractBookmarks.pdf");

        // Extract bookmarks from the document
        Aspose.Pdf.Facades.Bookmarks bookmarks = bookmarkEditor.ExtractBookmarks();

        // Iterate through each extracted bookmark
        foreach (Aspose.Pdf.Facades.Bookmark bookmark in bookmarks)
        {
            // Get the title information of bookmark item
            Console.WriteLine("Title: {0}", bookmark.Title);

            // Get the destination page for bookmark
            Console.WriteLine("Page Number: {0}", bookmark.PageNumber);
        }

        // Export bookmarks to an XML file
        bookmarkEditor.ExportBookmarksToXML(dataDir + "bookmarks.xml");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
private static void ExtractBookmarksFromPDFFile()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Bookmarks();

    // Create an instance of PdfBookmarkEditor
    using var bookmarkEditor = new Aspose.Pdf.Facades.PdfBookmarkEditor();

    // Bind PDF document
    bookmarkEditor.BindPdf(dataDir + "ExtractBookmarks.pdf");

    // Extract bookmarks from the document
    Aspose.Pdf.Facades.Bookmarks bookmarks = bookmarkEditor.ExtractBookmarks();

    // Iterate through each extracted bookmark
    foreach (Aspose.Pdf.Facades.Bookmark bookmark in bookmarks)
    {
        // Get the title information of bookmark item
        Console.WriteLine("Title: {0}", bookmark.Title);

        // Get the destination page for bookmark
        Console.WriteLine("Page Number: {0}", bookmark.PageNumber);
    }

    // Export bookmarks to an XML file
    bookmarkEditor.ExportBookmarksToXML(dataDir + "bookmarks.xml");
}