پرش به مطلب اصلی

بارگیری فایل از صندوقچه

مولفه‌ها​

  • نام صندوقچه
  • نام آبجکت (key)

نام آبجکت​

نام آبجکتی که می‌خواهیم دریافت کنیم.

اگر بخواهید نسخه‌ی خاصی از یک آبجکت را بارگیری کنید باید از کد زیر استفاده کنید.

GetObjectRequest request = new GetObjectRequest
{
    BucketName = bucketName,
    Key = keyName,
    VersionId = "foo"
};

Resource Base

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier:  Apache-2.0

namespace GetObjectExample
{
  using System;
  using System.IO;
  using System.Threading.Tasks;
  using Amazon;
  using Amazon.S3;
  using Amazon.S3.Model;

  /// <summary>
  /// This example shows how to use the Amazon Simple Storage System
  /// (Amazon S3) client to copy an object from an Amazon S3 bucket to
  /// another location such as your local system. The code uses the AWS
  /// SDK for .NET version 3.7 and .NET Core 5.0.
  /// </summary>
  class GetObject
  {
      private const string OBJECT_NAME = "<OBJECT_NAME>";

      public static async Task Main()
      {
          const string bucketName = "<BUCKET_NAME>";
          var keyName = OBJECT_NAME;

          var awsCredentials = new Amazon.Runtime.BasicAWSCredentials("<ACCESS-KEY>", "<SECRET-KEY>");
          var config = new AmazonS3Config { ServiceURL = "<ENDPOINT>" };
          IAmazonS3 _s3Client = new AmazonS3Client(awsCredentials, config);
          await ReadObjectDataAsync(_s3Client, bucketName, keyName);
      }

      /// <summary>
      /// This method copies the contents of the object keyName to another
      /// location, for example, to your local system.
      /// </summary>
      /// <param name="client">The initialize S3 client used to call
      /// GetObjectAsync.</param>
      /// <param name="bucketName">The name of the S3 bucket which contains
      /// the object to copy.</param>
      /// <param name="keyName">The name of the object you want to copy.</param>
      static async Task ReadObjectDataAsync(IAmazonS3 client, string bucketName, string keyName)
      {
          string responseBody = string.Empty;

          try
          {
              GetObjectRequest request = new GetObjectRequest
              {
                  BucketName = bucketName,
                  Key = keyName,
              };

              using (GetObjectResponse response = await client.GetObjectAsync(request))
              using (Stream responseStream = response.ResponseStream)
              using (StreamReader reader = new StreamReader(responseStream))
              {
                  // Assume you have "title" as medata added to the object.
                  string title = response.Metadata["x-amz-meta-title"];
                  string contentType = response.Headers["Content-Type"];

                  Console.WriteLine($"Object metadata, Title: {title}");
                  Console.WriteLine($"Content type: {contentType}");

                  // Retrieve the contents of the file.
                  responseBody = reader.ReadToEnd();

                  // Write the contents of the file to disk.
                  string filePath = keyName;

                  Console.WriteLine("File successfully downloaded");
              }
          }
          catch (AmazonS3Exception e)
          {
              // If the bucket or the object do not exist
              Console.WriteLine($"Error: '{e.Message}'");
          }
      }
  }
}