C# S3 样例

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2023-12-01

新建一个连接

下面的代码会新建一个连接，这样你就可以和服务器交互.

using System;
using Amazon;
using Amazon.S3;
using Amazon.S3.Model;

string accessKey = "put your access key here!";
string secretKey = "put your secret key here!";

AmazonS3Config config = new AmazonS3Config();
config.ServiceURL = "objects.dreamhost.com";

AmazonS3Client s3Client = new AmazonS3Client(
        accessKey,
        secretKey,
        config
        );

列出用户的所有 bucket

下面的代码会列出你的 bucket 的列表。这也会打印出每个bucket的 bucket 名和创建时间。

ListBucketsResponse response = client.ListBuckets();
foreach (S3Bucket b in response.Buckets)
{
        Console.WriteLine("{0}\t{1}", b.BucketName, b.CreationDate);
}

输出形式类似下面这样:

mahbuckat1   2011-04-21T18:05:39.000Z
mahbuckat2   2011-04-21T18:05:48.000Z
mahbuckat3   2011-04-21T18:07:18.000Z

新建一个 Bucket

下面的代码会新建一个名为 my-new-bucket 的bucket。

PutBucketRequest request = new PutBucketRequest();
request.BucketName = "my-new-bucket";
client.PutBucket(request);

列出 bucket 的内容

下面的代码会输出 bucket 内的所有对象列表。这也会打印出每一个对象的名字、文件尺寸和最近修改时间。

ListObjectsRequest request = new ListObjectsRequest();
request.BucketName = "my-new-bucket";
ListObjectsResponse response = client.ListObjects(request);
foreach (S3Object o in response.S3Objects)
{
        Console.WriteLine("{0}\t{1}\t{2}", o.Key, o.Size, o.LastModified);
}

输出形式类似下面这样:

myphoto1.jpg 251262  2011-08-08T21:35:48.000Z
myphoto2.jpg 262518  2011-08-08T21:38:01.000Z

删除 Bucket

Note

Bucket必须为空！否则它不会工作!

DeleteBucketRequest request = new DeleteBucketRequest();
request.BucketName = "my-new-bucket";
client.DeleteBucket(request);

强制删除非空 Buckets

Attention

不支持

新建一个对象

下面的代码会新建一个内容是字符串``”Hello World!”`` 的文件 hello.txt。

PutObjectRequest request = new PutObjectRequest();
request.BucketName      = "my-new-bucket";
request.Key         = "hello.txt";
request.ContentType = "text/plain";
request.ContentBody = "Hello World!";
client.PutObject(request);

修改一个对象的 ACL

下面的代码会将对象 hello.txt 的权限变为公开可读，而将 secret_plans.txt 的权限设为私有。

PutACLRequest request = new PutACLRequest();
request.BucketName = "my-new-bucket";
request.Key        = "hello.txt";
request.CannedACL  = S3CannedACL.PublicRead;
client.PutACL(request);

PutACLRequest request2 = new PutACLRequest();
request2.BucketName = "my-new-bucket";
request2.Key        = "secret_plans.txt";
request2.CannedACL  = S3CannedACL.Private;
client.PutACL(request2);

下载一个对象 (到文件)

下面的代码会下载对象 perl_poetry.pdf 并将它存到位置 C:\Users\larry\Documents

GetObjectRequest request = new GetObjectRequest();
request.BucketName = "my-new-bucket";
request.Key        = "perl_poetry.pdf";
GetObjectResponse response = client.GetObject(request);
response.WriteResponseStreamToFile("C:\\Users\\larry\\Documents\\perl_poetry.pdf");

删除一个对象

下面的代码会删除对象 goodbye.txt

DeleteObjectRequest request = new DeleteObjectRequest();
request.BucketName = "my-new-bucket";
request.Key        = "goodbye.txt";
client.DeleteObject(request);

生成对象的下载 URLs (带签名和不带签名)

下面的代码会为 hello.txt 生成一个无签名为下载URL。这个操作是生效是因为前面我们已经设置 hello.txt 的 ACL 为公开可读。下面的代码同时会为 secret_plans.txt 生成一个有效时间是一个小时的带签名的下载 URL。带签名的下载 URL 在这个时间内是可用的，即使对象的权限是私有(当时间到期后 URL 将不可用)。

Note

C# S3 库不支持生成不带签名的URLs，因此下面的实例只会展示如何生成代签名的 URLs.

GetPreSignedUrlRequest request = new GetPreSignedUrlRequest();
request.BucketName = "my-bucket-name";
request.Key        = "secret_plans.txt";
request.Expires    = DateTime.Now.AddHours(1);
request.Protocol   = Protocol.HTTP;
string url = client.GetPreSignedURL(request);
Console.WriteLine(url);

输出形式类似下面这样:

http://objects.dreamhost.com/my-bucket-name/secret_plans.txt?Signature=XXXXXXXXXXXXXXXXXXXXXXXXXXX&Expires=1316027075&AWSAccessKeyId=XXXXXXXXXXXXXXXXXXX