Hapus Anotasi (facades)

Hapus Semua Anotasi dari File PDF yang Ada

PdfAnnotationEditor memungkinkan Anda menghapus semua anotasi dari file PDF yang ada. Pertama, buat objek PdfAnnotationEditor dan ikat file PDF input menggunakan metode BindPdf. Setelah itu, panggil metode DeleteAnnotations untuk menghapus semua anotasi dari file, dan kemudian gunakan metode Save untuk menyimpan file PDF yang diperbarui. Potongan kode berikut menunjukkan cara menghapus semua anotasi dari file PDF.

.NET Core 3.1

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

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

        // Delete all annoations
        annotationEditor.DeleteAnnotations();

        // Save PDF document
        annotationEditor.Save(dataDir + "DeleteAllAnnotationsFromPage_out.pdf");
    }
}

.NET 8

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

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

    // Bind PDF document
    annotationEditor.BindPdf(dataDir + "DeleteAllAnnotationsFromPage.pdf");

    // Delete all annoations
    annotationEditor.DeleteAnnotations();

    // Save PDF document
    annotationEditor.Save(dataDir + "DeleteAllAnnotationsFromPage_out.pdf");
}

Hapus Semua Anotasi berdasarkan Tipe yang Ditentukan

Anda dapat menggunakan kelas PdfAnnotationEditor untuk menghapus semua anotasi, berdasarkan tipe anotasi yang ditentukan, dari file PDF yang ada. Untuk melakukan itu, Anda perlu membuat objek PdfAnnotationEditor dan mengikat file PDF input menggunakan metode BindPdf. Setelah itu, panggil metode DeleteAnnotations, dengan parameter string, untuk menghapus semua anotasi dari file; parameter string mewakili tipe anotasi yang akan dihapus. Akhirnya, gunakan metode Save untuk menyimpan file PDF yang diperbarui. Potongan kode berikut menunjukkan cara menghapus semua anotasi berdasarkan tipe anotasi yang ditentukan.

.NET Core 3.1

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

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "DeleteAllAnnotations.pdf"))
    {
        // Collect all annotation types from all pages
        var annotationTypes = new List<string>();
        foreach (Aspose.Pdf.Page page in document.Pages)
        {
            // If page has no annotations, skip it
            if (page.Annotations == null)
            {
                continue;
            }

            // Retrieve each annotation type from the page
            IEnumerable<string> pageAnnotationTypes = page.Annotations.Select(ann => ann.AnnotationType.ToString());
            annotationTypes.AddRange(pageAnnotationTypes);
        }

        // Make the list of annotation types distinct
        annotationTypes = annotationTypes.Distinct().ToList();

        // Display each annotation type to the user
        int index;
        for (index = 0; index < annotationTypes.Count; index++)
        {
            Console.WriteLine($"{index + 1}. {annotationTypes[index]}");
        }

        // Prompt user to choose the annotation type to delete
        Console.Write("Please enter number: ");
        index = int.Parse(Console.ReadLine()) - 1;

        // Create an instance of PdfAnnotationEditor
        using (var annotationEditor = new Aspose.Pdf.Facades.PdfAnnotationEditor())
        {
            // Bind PDF document
            annotationEditor.BindPdf(document);

            // Delete the annotation selected by the user
            annotationEditor.DeleteAnnotations(annotationTypes[index]);

            // Save PDF document
            annotationEditor.Save(dataDir + "DeleteAllAnnotationByType_out.pdf");
        }
    }
}

.NET 8

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

    // Open PDF document
    using var document = new Aspose.Pdf.Document(dataDir + "DeleteAllAnnotations.pdf");

    // Collect all annotation types from all pages
    var annotationTypes = new List<string>();
    foreach (Aspose.Pdf.Page page in document.Pages)
    {
        // If page has no annotations, skip it
        if (page.Annotations == null)
        {
            continue;
        }

        // Retrieve each annotation type from the page
        IEnumerable<string> pageAnnotationTypes = page.Annotations.Select(ann => ann.AnnotationType.ToString());
        annotationTypes.AddRange(pageAnnotationTypes);
    }

    // Make the list of annotation types distinct
    annotationTypes = annotationTypes.Distinct().ToList();

    // Display each annotation type to the user
    int index;
    for (index = 0; index < annotationTypes.Count; index++)
    {
        Console.WriteLine($"{index + 1}. {annotationTypes[index]}");
    }

    // Prompt user to choose the annotation type to delete
    Console.Write("Please enter number: ");
    index = int.Parse(Console.ReadLine()) - 1;

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

    // Bind PDF document
    annotationEditor.BindPdf(document);

    // Delete the annotation selected by the user
    annotationEditor.DeleteAnnotations(annotationTypes[index]);

    // Save PDF document
    annotationEditor.Save(dataDir + "DeleteAllAnnotationByType_out.pdf");
}

Hapus Anotasi berdasarkan Nama yang Ditentukan

Anda dapat menggunakan kelas PdfAnnotationEditor untuk menghapus anotasi tertentu, berdasarkan nama unik-nya, dari file PDF yang ada. Untuk melakukan itu, Anda perlu membuat objek PdfAnnotationEditor dan mengikat file PDF input menggunakan metode BindPdf. Setelah itu, panggil metode DeleteAnnotation, dengan menyertakan nama anotasi yang akan dihapus. Akhirnya, gunakan metode Save untuk menyimpan file PDF yang diperbarui. Potongan kode berikut menunjukkan cara menghapus anotasi berdasarkan namanya.

.NET Core 3.1

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

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "DeleteAllAnnotations.pdf"))
    {
        // Display the list of annotations in the first page (adjust as needed for multiple pages)
        int index;
        for (index = 1; index <= document.Pages[1].Annotations.Count; index++)
        {
            Console.WriteLine($"{index}. {document.Pages[1].Annotations[index].Name} {document.Pages[1].Annotations[index].AnnotationType}");
        }

        // Prompt the user to enter the index of the annotation to delete
        Console.Write("Please enter number: ");
        index = int.Parse(Console.ReadLine());

        // Create an instance of PdfAnnotationEditor
        using (var annotationEditor = new Aspose.Pdf.Facades.PdfAnnotationEditor())
        {
            // Bind PDF document
            annotationEditor.BindPdf(document);

            // Delete the annotation selected by the user
            annotationEditor.DeleteAnnotation(document.Pages[1].Annotations[index].Name);

            // Save PDF document
            annotationEditor.Save(dataDir + "DeleteAnnotationByName_out.pdf");
        }
    }
}

.NET 8

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

    // Open PDF document
    using var document = new Aspose.Pdf.Document(dataDir + "DeleteAllAnnotations.pdf");

    // Display the list of annotations in the first page (adjust as needed for multiple pages)
    int index;
    for (index = 1; index <= document.Pages[1].Annotations.Count; index++)
    {
        Console.WriteLine($"{index}. {document.Pages[1].Annotations[index].Name} {document.Pages[1].Annotations[index].AnnotationType}");
    }

    // Prompt the user to enter the index of the annotation to delete
    Console.Write("Please enter number: ");
    index = int.Parse(Console.ReadLine());

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

    // Bind PDF document
    annotationEditor.BindPdf(document);

    // Delete the annotation selected by the user
    annotationEditor.DeleteAnnotation(document.Pages[1].Annotations[index].Name);

    // Save PDF document
    annotationEditor.Save(dataDir + "DeleteAnnotationByName_out.pdf");
}