AWS SDK Version 3 for .NET
API Reference

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Returns information about the InitiateMultipartUpload response and response metadata.

Inheritance Hierarchy


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


public class InitiateMultipartUploadResponse : AmazonWebServiceResponse

The InitiateMultipartUploadResponse type exposes the following members



Public Property AbortDate System.DateTime

Date when multipart upload will become eligible for abort operation by lifecycle.

Public Property AbortRuleId System.String

Id of the lifecycle rule that makes a multipart upload eligible for abort operation.

Public Property BucketName System.String

Name of the bucketName to which the multipart upload was initiated.

When using this API with an access point, you must direct requests to the access point hostname. The access point hostname takes the form When using this operation using an access point through the AWS SDKs, you provide the access point ARN in place of the bucket name. For more information about access point ARNs, see Using Access Points in the Amazon Simple Storage Service Developer Guide.

Public Property ContentLength System.Int64 Inherited from Amazon.Runtime.AmazonWebServiceResponse.
Public Property HttpStatusCode System.Net.HttpStatusCode Inherited from Amazon.Runtime.AmazonWebServiceResponse.
Public Property Key System.String

Object key for which the multipart upload was initiated.

Public Property RequestCharged Amazon.S3.RequestCharged

If present, indicates that the requester was successfully charged for the request.

Public Property ResponseMetadata Amazon.Runtime.ResponseMetadata Inherited from Amazon.Runtime.AmazonWebServiceResponse.
Public Property ServerSideEncryptionCustomerMethod Amazon.S3.ServerSideEncryptionCustomerMethod

The Server-side encryption algorithm to be used with the customer provided key.

Public Property ServerSideEncryptionCustomerProvidedKeyMD5 System.String

The MD5 of the customer encryption key specified in the ServerSideEncryptionCustomerProvidedKey property. The MD5 is base 64 encoded. This field is optional, the SDK will calculate the MD5 if this is not set.

Public Property ServerSideEncryptionKeyManagementServiceEncryptionContext System.String

Specifies the AWS KMS Encryption Context to use for object encryption. The value of this header is a base64-encoded UTF-8 string holding JSON with the encryption context key-value pairs.

Public Property ServerSideEncryptionKeyManagementServiceKeyId System.String

The id of the AWS Key Management Service key that Amazon S3 uses to encrypt and decrypt the object.

Public Property ServerSideEncryptionMethod Amazon.S3.ServerSideEncryptionMethod

The Server-side encryption algorithm used when storing this object in S3.

Public Property UploadId System.String

Gets and sets the initiated multipart upload id.


This example shows how to upload 13MB of data using mutlipart upload.
The data is contained in a stream and the upload is done in 3 parts: 5MB, 5MB, then the remainder.

Multipart Upload Sample

int MB = (int)Math.Pow(2, 20);

// Create a client
AmazonS3Client client = new AmazonS3Client();

// Define input stream
Stream inputStream = Create13MBDataStream();

// Initiate multipart upload
InitiateMultipartUploadRequest initRequest = new InitiateMultipartUploadRequest
    BucketName = "SampleBucket",
    Key = "Item1"
InitiateMultipartUploadResponse initResponse = client.InitiateMultipartUpload(initRequest);

// Upload part 1
UploadPartRequest uploadRequest = new UploadPartRequest
    BucketName = "SampleBucket",
    Key = "Item1",
    UploadId = initResponse.UploadId,
    PartNumber = 1,
    PartSize = 5 * MB,
    InputStream = inputStream
UploadPartResponse up1Response = client.UploadPart(uploadRequest);

// Upload part 2
uploadRequest = new UploadPartRequest
    BucketName = "SampleBucket",
    Key = "Item1",
    UploadId = initResponse.UploadId,
    PartNumber = 2,
    PartSize = 5 * MB,
    InputStream = inputStream
UploadPartResponse up2Response = client.UploadPart(uploadRequest);

// Upload part 3
uploadRequest = new UploadPartRequest
    BucketName = "SampleBucket",
    Key = "Item1",
    UploadId = initResponse.UploadId,
    PartNumber = 3,
    InputStream = inputStream
UploadPartResponse up3Response = client.UploadPart(uploadRequest);

// List parts for current upload
ListPartsRequest listPartRequest = new ListPartsRequest
    BucketName = "SampleBucket",
    Key = "Item1",
    UploadId = initResponse.UploadId
ListPartsResponse listPartResponse = client.ListParts(listPartRequest);
Debug.Assert(listPartResponse.Parts.Count == 3);

// Complete the multipart upload
CompleteMultipartUploadRequest compRequest = new CompleteMultipartUploadRequest
    BucketName = "SampleBucket",
    Key = "Item1",
    UploadId = initResponse.UploadId,
    PartETags = new List<PartETag>
        new PartETag { ETag = up1Response.ETag, PartNumber = 1 },
        new PartETag { ETag = up2Response.ETag, PartNumber = 2 },
        new PartETag { ETag = up3Response.ETag, PartNumber = 3 }
CompleteMultipartUploadResponse compResponse = client.CompleteMultipartUpload(compRequest);


Version Information

.NET Core App:
Supported in: 3.1

.NET Standard:
Supported in: 2.0, 1.3

.NET Framework:
Supported in: 4.5, 4.0, 3.5