使用Sharepoint CSOM调用GetItemById时如何获取AttachmentFiles？

using Microsoft.SharePoint.Client;

// 连接到Sharepoint站点
ClientContext clientContext = new ClientContext("https://your-sharepoint-site-url");

// 获取根Web
Web web = clientContext.Web;

// 获取列表集合
ListCollection lists = web.Lists;

// 获取指定的列表
List list = lists.GetByTitle("Your List Title");

// 获取指定ID的列表项
ListItem listItem = list.GetItemById(1);

// 获取附件文件集合
AttachmentCollection attachments = listItem.AttachmentFiles;

// 遍历附件文件集合
clientContext.Load(attachments);
clientContext.ExecuteQuery();

foreach (Attachment attachment in attachments)
{
    // 获取附件文件的名称
    string fileName = attachment.FileName;

    // 获取附件文件的大小
    long fileSize = attachment.Length;

    // 获取附件文件的创建日期
    DateTime createdDate = attachment.TimeCreated;

    // 打印附件文件信息
    Console.WriteLine("Attachment: {0} ({1} bytes, created on {2})", fileName, fileSize, createdDate);
}