using Amazon;  using Amazon.Runtime;  using Amazon.S3;  using Amazon.S3.Model;  using System;  using System.Collections.Generic;  using System.IO;  using System.Text;  using System.Threading.Tasks;    /*       //上传篮球资料图片       AwsS3Helper s3 = new AwsS3Helper(ResourceType.basketballnewsImg);       s3.WritingAnObjectAsync("E:\11\test1.jpg").Wait();   */  namespace AwsS3WithNetCore  {        /// <summary>      ///Amazon S3 上传数据（照片、视频、文档等）      /// </summary>      public class AwsS3Helper      {            /// <summary>          /// 地区是亚太香港          /// </summary>          readonly RegionEndpoint bucketRegion = RegionEndpoint.GetBySystemName("ap-east-1");              /// <summary>          /// 要向 Amazon S3 上传数据（照片、视频、文档等），          /// 您必须首先在其中一个 AWS 区域中创建 S3 存储桶, 比如：在亚太香港地址，创建了一个gfbk桶          /// 然后，您可以将任何数量的对象上传到该存储桶。          /// 每个 AWS 账户中创建多达 100 个存储桶，一个存储桶中可以存储任意数量的对象。          /// 资料：https://docs.aws.amazon.com/zh_cn/AmazonS3/latest/dev/UsingBucket.html          /// </summary>          readonly string bucketName = Constants.bucketName;              /// <summary>          /// 请求S3的凭据          /// </summary>          readonly AWSCredentials awsCredentials = new BasicAWSCredentials(Constants.accessKey, Constants.secretKey);              /// <summary>          /// 请求客户端          /// </summary>          AmazonS3Client client = null;              /// <summary>          /// 上传资源类型          /// </summary>          ResourceType _resourceType;            public AwsS3Helper(ResourceType resourceType)          {              _resourceType = resourceType;              client = new AmazonS3Client(awsCredentials, bucketRegion);          }              /// <summary>          ///创建一个桶          /// </summary>          /// <returns></returns>          public async Task CreateBucket()          {              var putBucketRequest = new PutBucketRequest              {                  BucketName = bucketName,                  UseClientRegion = true              };              PutBucketResponse putBucketResponse = await client.PutBucketAsync(putBucketRequest);              string bucketLocation = await FindBucketLocationAsync(client);          }              /// <summary>          /// 查找桶所在的地区          /// </summary>          /// <param name="client"></param>          /// <returns></returns>          private async Task<string> FindBucketLocationAsync(IAmazonS3 client)          {              string bucketLocation;              var request = new GetBucketLocationRequest()              {                  BucketName = bucketName              };              GetBucketLocationResponse response = await client.GetBucketLocationAsync(request);              bucketLocation = response.Location.ToString();              return bucketLocation;          }                /// <summary>          /// 上传文件          /// </summary>          /// <param name="uploadFilePath">上传的文件地址如:E:test.jpg</param>          /// <returns></returns>          public async Task<bool> WritingAnObjectAsync(string uploadFilePath)          {              try              {                  string filename = uploadFilePath.Substring(uploadFilePath.LastIndexOf('\')+1);                  string key = string.Format("resource/img/{0}/{1}", _resourceType.ToString().Replace("Img", ""), filename);                  var putRequest2 = new PutObjectRequest                  {                      BucketName = bucketName,                      //获取和设置键属性。此键用于标识S3中的对象,上传到s3的路径+文件名，                      //S3上没有文件夹可以创建一个，参考https://www.cnblogs.com/web424/p/6840207.html                      Key = key,                      //所有者获得完全控制权，匿名主体被授予读访问权。如果                      //此策略用于对象，它可以从浏览器中读取，无需验证                      CannedACL = S3CannedACL.PublicRead,                      //上传的文件路径                      FilePath = uploadFilePath,                      //为对象设置的标记。标记集必须编码为URL查询参数                      TagSet = new List<Tag>{                                      new Tag { Key = "Test", Value = "S3Test"} }                      //ContentType = "image/png"                  };                  putRequest2.Metadata.Add("x-amz-meta-title", "AwsS3Net");                  PutObjectResponse response2 = await client.PutObjectAsync(putRequest2);                  return true;              }              catch (AmazonS3Exception e)              {                  throw new Exception(string.Format("Error encountered ***. Message:'{0}' when writing an object", e.Message));              }              catch (Exception e)              {                  throw new Exception(string.Format("Unknown encountered on server. Message:'{0}' when writing an object", e.Message));              }          }                /// <summary>          /// 上传文件 (未经测试)          /// </summary>          /// <param name="inputStream">以流的形式</param>          /// <returns></returns>          public async Task<bool> WritingAnObjectByStreamAsync(Stream inputStream,string filename)          {              string key = string.Format("resource/img/{0}/{1}", _resourceType.ToString().Replace("Img", ""), filename);              try              {                  var putRequest1 = new PutObjectRequest                  {                      BucketName = bucketName,                      //创建对象时，要指定键名，它在存储桶中唯一地标识该对象                      Key = key,                      InputStream= inputStream                  };                  PutObjectResponse response1 = await client.PutObjectAsync(putRequest1);                  return true;              }              catch (AmazonS3Exception e)              {                  throw new Exception(string.Format("Error encountered ***. Message:'{0}' when writing an object", e.Message));              }              catch (Exception e)              {                  throw new Exception(string.Format("Unknown encountered on server. Message:'{0}' when writing an object", e.Message));              }          }              /// <summary>          /// 删除一个对象          /// </summary>          /// <param name="key">删除的对象的键如:resource/img/basketballnews/test1.jpg</param>          /// <returns></returns>          public async Task<bool> DeleteAnObjectAsync(string key)          {              try              {                  // 1. Delete object-specify only key name for the object.                  var deleteRequest1 = new DeleteObjectRequest                  {                      BucketName = bucketName,                      Key = key                  };                  DeleteObjectResponse response1 = await client.DeleteObjectAsync(deleteRequest1);                  return true;              }              catch (AmazonS3Exception e)              {                  throw new Exception(string.Format("Error encountered ***. Message:'{0}' when writing an object", e.Message));              }              catch (Exception e)              {                  throw new Exception(string.Format("Unknown encountered on server. Message:'{0}' when writing an object", e.Message));              }          }              /// <summary>          /// 获取          /// </summary>          /// <param name="prefix">限制对以指定前缀开头的键的响应</param>          /// <returns></returns>          public async Task<List<S3Object>> ListObjectsAsync(string prefix = "")          {              try              {                    var list = new ListObjectsRequest                  {                      BucketName = bucketName,                      Prefix = prefix                  };                    ListObjectsResponse response1 = await client.ListObjectsAsync(list);                    return response1.S3Objects;              }              catch (AmazonS3Exception e)              {                  throw new Exception(string.Format("Error encountered ***. Message:'{0}' when writing an object", e.Message));              }              catch (Exception e)              {                  throw new Exception(string.Format("Unknown encountered on server. Message:'{0}' when writing an object", e.Message));              }          }      }            public enum ResourceType      {          basketballnewsImg,          footballnewsImg,          bannerImg,          videoImg,          logoImg      }        internal class Constants      {          internal const string bucketName = "gfbk";//Write your bucket name          internal const string accessKey = "xxxxxx"; // write your IAM credentials first access key          internal const string secretKey = "xxxxxx"; // write your IAM credentials second access key(secret key)      }  }