使用高階 .NET TransferUtility 類別上傳目錄 - Amazon Simple Storage Service

本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

使用高階 .NET TransferUtility 類別上傳目錄

您可以使用 TransferUtility 類別，上傳整個目錄。根據預設，API 只會上傳指定目錄之根目錄中的檔案。但您可以指定以遞迴方式，上傳所有子目錄中的檔案。

也可以根據一些篩選條件，指定篩選運算式，來選取指定目錄中的檔案。例如，若只要從目錄上傳 .pdf 檔案，可以指定 "*.pdf" 的篩選運算式。

從目錄上傳檔案時，無法指定結果物件的金鑰名稱。Amazon S3 使用原始檔案路徑，建構金鑰名稱。例如，假設您有一個目錄為 c:\myfolder，其結構如下：

C:\myfolder
      \a.txt
      \b.pdf
      \media\               
             An.mp3

當您上傳此目錄時，Amazon S3 會使用下列金鑰名稱：

a.txt
b.pdf
media/An.mp3

下列 C# 範例會將目錄上傳至 Amazon S3 儲存貯體。此顯示如何使用不同的 TransferUtility.UploadDirectory 多載上傳目錄。每個後續的呼叫都會上傳取代前一個上傳。如需如何建立及測試工作範例的說明，請參閱「執行 Amazon S3 .NET 程式碼範例」。

using Amazon;
using Amazon.S3;
using Amazon.S3.Transfer;
using System;
using System.IO;
using System.Threading.Tasks;

namespace Amazon.DocSamples.S3
{
    class UploadDirMPUHighLevelAPITest
    {
        private const string existingBucketName = "*** bucket name ***";
        private const string directoryPath = @"*** directory path ***";
        // The example uploads only .txt files.
        private const string wildCard = "*.txt";
        // Specify your bucket region (an example region is shown).
        private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2;
        private static IAmazonS3 s3Client;
        static void Main()
        {
            s3Client = new AmazonS3Client(bucketRegion);
            UploadDirAsync().Wait();
        }

        private static async Task UploadDirAsync()
        {
            try
            {
                var directoryTransferUtility =
                    new TransferUtility(s3Client);

                // 1. Upload a directory.
                await directoryTransferUtility.UploadDirectoryAsync(directoryPath,
                    existingBucketName);
                Console.WriteLine("Upload statement 1 completed");

                // 2. Upload only the .txt files from a directory 
                //    and search recursively. 
                await directoryTransferUtility.UploadDirectoryAsync(
                                               directoryPath,
                                               existingBucketName,
                                               wildCard,
                                               SearchOption.AllDirectories);
                Console.WriteLine("Upload statement 2 completed");

                // 3. The same as Step 2 and some optional configuration. 
                //    Search recursively for .txt files to upload.
                var request = new TransferUtilityUploadDirectoryRequest
                {
                    BucketName = existingBucketName,
                    Directory = directoryPath,
                    SearchOption = SearchOption.AllDirectories,
                    SearchPattern = wildCard
                };

                await directoryTransferUtility.UploadDirectoryAsync(request);
                Console.WriteLine("Upload statement 3 completed");
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine(
                        "Error encountered ***. Message:'{0}' when writing an object", e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine(
                    "Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
            }
        }
    }
}