如何将HTTPPostedFileBase转换为Google Drive API文件

using Google.Apis.Auth.OAuth2;
using Google.Apis.Drive.v3;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using System.IO;
using System.Threading;

public class GoogleDriveHelper
{
    private static string[] Scopes = { DriveService.Scope.Drive };
    private static string ApplicationName = "Your Application Name";

    public static void UploadFileToDrive(HTTPPostedFileBase file)
    {
        UserCredential credential;

        using (var stream = new FileStream("credentials.json", FileMode.Open, FileAccess.Read))
        {
            string credPath = "token.json";
            credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                GoogleClientSecrets.Load(stream).Secrets,
                Scopes,
                "user",
                CancellationToken.None,
                new FileDataStore(credPath, true)).Result;
        }

        // 创建Drive API服务
        var service = new DriveService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = ApplicationName,
        });

        // 创建文件元数据
        var fileMetadata = new Google.Apis.Drive.v3.Data.File()
        {
            Name = file.FileName,
            MimeType = file.ContentType
        };

        // 将HTTPPostedFileBase对象的内容写入文件
        using (var stream = new MemoryStream())
        {
            file.InputStream.CopyTo(stream);
            var byteArray = stream.ToArray();
            FilesResource.CreateMediaUpload request;
            using (var memoryStream = new MemoryStream(byteArray))
            {
                request = service.Files.Create(fileMetadata, memoryStream, file.ContentType);
                request.Upload();
            }
        }

        // 获取上传后的文件ID
        var uploadedFile = request.ResponseBody;
        var fileId = uploadedFile.Id;

        // 打印文件链接
        var fileLink = $"https://drive.google.com/file/d/{fileId}/view";
        Console.WriteLine($"File uploaded successfully. Link: {fileLink}");
    }
}