Storage Client Library for Windows Phone (Version 7.0)

Initiates an asynchronous operation to commit a new block of data to the end of the blob.

Namespace:   Microsoft.WindowsAzure.Storage.Blob
Assembly:  Microsoft.WindowsAzure.Storage (in Microsoft.WindowsAzure.Storage.dll)

Syntax

C#

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[DoesServiceRequestAttribute]
public virtual Task<long> AppendBlockAsync(
	Stream blockData,
	string contentMD5,
	CancellationToken cancellationToken
)

C++

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public:
[DoesServiceRequestAttribute]
virtual Task<long long>^ AppendBlockAsync(
	Stream^ blockData,
	String^ contentMD5,
	CancellationToken cancellationToken
)

F#

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[<DoesServiceRequestAttribute>]
abstract AppendBlockAsync : 
        blockData:Stream *
        contentMD5:string *
        cancellationToken:CancellationToken -> Task<int64>
[<DoesServiceRequestAttribute>]
override AppendBlockAsync : 
        blockData:Stream *
        contentMD5:string *
        cancellationToken:CancellationToken -> Task<int64>

VB

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<DoesServiceRequestAttribute>
Public Overridable Function AppendBlockAsync (
	blockData As Stream,
	contentMD5 As String,
	cancellationToken As CancellationToken
) As Task(Of Long)

Parameters

blockData

Type: System.IO.StreamSystem.IO::Stream^System.IO.StreamSystem.IO.Stream

A Stream object that provides the data for the block.

contentMD5

Type: System.StringSystem::String^System.StringSystem.String

An optional hash value used to ensure transactional integrity for the block. May be null or an empty string.

cancellationToken

Type: System.Threading.CancellationTokenSystem.Threading::CancellationTokenSystem.Threading.CancellationTokenSystem.Threading.CancellationToken

A CancellationToken to observe while waiting for a task to complete.

Return Value

Type: System.Threading.Tasks.Task<Int64>System.Threading.Tasks::Task<Int64>^System.Threading.Tasks.Task<Int64>System.Threading.Tasks.Task(Of Int64)

A Task object that represents the asynchronous operation.

Remarks

Clients may send the Content-MD5 header for a given Put Block operation as a means to ensure transactional integrity over the wire. The contentMD5 parameter permits clients who already have access to a pre-computed MD5 value for a given byte range to provide it. If the P:BlobRequestOptions.UseTransactionalMd5Referenced topic's target id should not be empty. Article id: da8b1fe2-6397-40ab-8119-e332015e42a2, link: P:BlobRequestOptions.UseTransactionalMd5. property is set to true and the contentMD5 parameter is set to null, then the client library will calculate the MD5 value internally.

See Also

AppendBlockAsync Overload
CloudAppendBlob Class
Microsoft.WindowsAzure.Storage.Blob Namespace

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