AWS SDK Version 3 for .NET
API Reference

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Uploads the specified file. Multiple threads are used to read the file and perform multiple uploads in parallel. For large uploads, the file will be divided and uploaded in parts using Amazon S3's multipart API. The parts will be reassembled as one object in Amazon S3.

Note:

This is an asynchronous operation using the standard naming convention for .NET 4.5 or higher. For .NET 3.5 the operation is implemented as a pair of methods using the standard naming convention of BeginUpload and EndUpload.

Namespace: Amazon.S3.Transfer
Assembly: AWSSDK.S3.dll
Version: 3.x.y.z

Syntax

C# 
public virtual Task UploadAsync(
         String filePath,
         String bucketName,
         String key,
         CancellationToken cancellationToken
)

Parameters

filePath
Type: System.String

The file path of the file to upload.

bucketName
Type: System.String

The target Amazon S3 bucket, that is, the name of the bucket to upload the file to.

key
Type: System.String

The key under which the Amazon S3 object is stored.

cancellationToken
Type: System.Threading.CancellationToken

A cancellation token that can be used by other objects or threads to receive notice of cancellation.

Return Value


Type: Task
The task object representing the asynchronous operation.

Remarks

If you are uploading large files, TransferUtility will use multipart upload to fulfill the request. If a multipart upload is interrupted, TransferUtility will attempt to abort the multipart upload. Under certain circumstances (network outage, power failure, etc.), TransferUtility will not be able to abort the multipart upload. In this case, in order to stop getting charged for the storage of uploaded parts, you should manually invoke TransferUtility.AbortMultipartUploadsAsync() to abort the incomplete multipart uploads.

For nonseekable streams or streams with an unknown length, TransferUtility will use multipart upload and buffer up to a part size in memory until the final part is reached and complete the upload. The buffer for the multipart upload is controlled by S3Constants.MinPartSize and the default value is 5 megabytes. You can also adjust the read buffer size(i.e.how many bytes to read before writing to the part buffer) via the BufferSize property on the ClientConfig.The default value for this is 8192 bytes.

Version Information

.NET Core App:
Supported in: 3.1

.NET Standard:
Supported in: 2.0

.NET Framework:
Supported in: 4.5