在官网下载对应的sdk http://aws.amazon.com/cn/sdk-for-net/
然后再aws上为s3上的bucket生成密钥对 access_key和secret_key
调用对应的sdk
TransferUtility transferUtility = new TransferUtility(S3_ACCESS_KEY, S3_SECRET_KEY, RegionEndpoint.APSoutheast1);
transferUtility.Upload(localFilePath, S3_BUCKET_NAME, s3FilePath);
这样就可以把本地文件上传到s3上