使用 PdfContentEditor 处理图像

从 PDF 的特定页面删除图像 (Facades)

为了从特定页面删除图像，您需要调用 DeleteImage 方法，并传入 pageNumber 和 index 参数。index 参数表示一个整数数组——要删除的图像的索引。首先，您需要创建一个 PdfContentEditor 类的对象，然后调用 DeleteImage 方法。之后，您可以使用 Save 方法保存更新后的 PDF 文件。

以下代码片段演示了如何从 PDF 的特定页面删除图像。

.NET Core 3.1

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

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor(new Aspose.Pdf.Document(dataDir + "sample.pdf")))
    {
        editor.DeleteImage(2, new[] { 2 });

        // Save PDF document
        editor.Save(dataDir + "PdfContentEditorDemo10.pdf");
    }
}

.NET 8

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

    // Instantiate PdfContentEditor Object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor(new Aspose.Pdf.Document(dataDir + "sample.pdf"));

    editor.DeleteImage(2, new[] { 2 });

    // Save PDF document
    editor.Save(dataDir + "PdfContentEditorDemo10.pdf");
}

从 PDF 文件中删除所有图像 (Facades)

可以使用 PdfContentEditor 的 DeleteImage 方法从 PDF 文件中删除所有图像。调用 DeleteImage 方法——不带任何参数的重载——以删除所有图像，然后使用 Save 方法保存更新后的 PDF 文件。

以下代码片段演示了如何从 PDF 文件中删除所有图像。

.NET Core 3.1

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

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor(new Aspose.Pdf.Document(dataDir + "sample.pdf")))
    {
        editor.DeleteImage();

        // Save PDF document
        editor.Save(dataDir + "PdfContentEditorDemo11.pdf");
    }
}

.NET 8

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

    // Instantiate PdfContentEditor object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor(new Aspose.Pdf.Document(dataDir + "sample.pdf"));

    editor.DeleteImage();

    // Save PDF document
    editor.Save(dataDir + "PdfContentEditorDemo11.pdf");
}

在 PDF 文件中替换图像 (Facades)

PdfContentEditor 允许您在 PDF 文件中替换图像，调用 ReplaceImage 方法，并保存结果。

.NET Core 3.1

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

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor(new Aspose.Pdf.Document(dataDir + "sample_cats_dogs.pdf")))
    {
        editor.ReplaceImage(2, 4, dataDir + "Image.jpg");

        // Save PDF document
        editor.Save(dataDir + "PdfContentEditorDemo12.pdf");
    }
}

.NET 8

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

    // Instantiate PdfContentEditor object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor(new Aspose.Pdf.Document(dataDir + "sample_cats_dogs.pdf"));
    editor.ReplaceImage(2, 4, dataDir + "Image.jpg");

    // Save PDF document
    editor.Save(dataDir + "PdfContentEditorDemo12.pdf");
}