设置现有 PDF 的 XMP 元数据

为了在 PDF 文件中设置 XMP 元数据，您需要创建 PdfXmpMetadata 对象，并使用 BindPdf 方法绑定 PDF 文件。您可以使用 PdfXmpMetadata 类的 Add 方法添加不同的属性。最后，调用 PdfXmpMetadata 类的 Save 方法。以下代码片段向您展示如何在 PDF 文件中添加 XMP 元数据。

.NET Core 3.1

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

    // Create PdfXmpMetadata object
    using (var xmpMetaData = new Aspose.Pdf.Facades.PdfXmpMetadata())
    {
        // Bind PDF document
        xmpMetaData.BindPdf(dataDir + "SetXMPMetadata.pdf");

        // Add create date
        xmpMetaData.Add(Aspose.Pdf.Facades.DefaultMetadataProperties.CreateDate, DateTime.Now.ToString());

        // Change meta data date
        xmpMetaData[Aspose.Pdf.Facades.DefaultMetadataProperties.MetadataDate] = DateTime.Now.ToString();

        // Add creator tool
        xmpMetaData.Add(Aspose.Pdf.Facades.DefaultMetadataProperties.CreatorTool, "Creator tool name");

        // Remove modify date
        xmpMetaData.Remove(Aspose.Pdf.Facades.DefaultMetadataProperties.ModifyDate);

        // Add user defined property
        // Register namespace prefix and URI
        xmpMetaData.RegisterNamespaceURI("customNamespace", "http:// Www.customNameSpaces.com/ns/");

        // Add user property with the prefix
        xmpMetaData.Add("customNamespace:UserPropertyName", "UserPropertyValue");

        // Change user defined property
        xmpMetaData["customNamespace:UserPropertyName"] = "UserPropertyValue2";

        // Save PDF document
        xmpMetaData.Save(dataDir + "SetXMPMetadata_out.pdf");
    }
}

.NET 8

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

    // Create PdfXmpMetadata object
    using var xmpMetaData = new Aspose.Pdf.Facades.PdfXmpMetadata();

    // Bind PDF document
    xmpMetaData.BindPdf(dataDir + "SetXMPMetadata.pdf");

    // Add create date
    xmpMetaData.Add(Aspose.Pdf.Facades.DefaultMetadataProperties.CreateDate, DateTime.Now.ToString());

    // Change meta data date
    xmpMetaData[Aspose.Pdf.Facades.DefaultMetadataProperties.MetadataDate] = DateTime.Now.ToString();

    // Add creator tool
    xmpMetaData.Add(Aspose.Pdf.Facades.DefaultMetadataProperties.CreatorTool, "Creator tool name");

    // Remove modify date
    xmpMetaData.Remove(Aspose.Pdf.Facades.DefaultMetadataProperties.ModifyDate);

    // Add user defined property
    // register namespace prefix and URI
    xmpMetaData.RegisterNamespaceURI("customNamespace", "http:// Www.customNameSpaces.com/ns/");

    // Add user property with the prefix
    xmpMetaData.Add("customNamespace:UserPropertyName", "UserPropertyValue");

    // Change user defined property
    xmpMetaData["customNamespace:UserPropertyName"] = "UserPropertyValue2";

    // Save PDF document
    xmpMetaData.Save(dataDir + "SetXMPMetadata_out.pdf");
}