CloudAppendBlob.UploadFromFileAsync Method (String, CancellationToken) (Microsoft.WindowsAzure.Storage.Blob)

Initiates an asynchronous operation to upload a file to an append blob. If the blob already exists, it will be overwritten. Recommended only for single-writer scenarios.

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

Syntax

C#

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[DoesServiceRequestAttribute]
public virtual Task UploadFromFileAsync(
	string path,
	CancellationToken cancellationToken
)

C++

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public:
[DoesServiceRequestAttribute]
virtual Task^ UploadFromFileAsync(
	String^ path,
	CancellationToken cancellationToken
)

F#

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[<DoesServiceRequestAttribute>]
abstract UploadFromFileAsync : 
        path:string *
        cancellationToken:CancellationToken -> Task
[<DoesServiceRequestAttribute>]
override UploadFromFileAsync : 
        path:string *
        cancellationToken:CancellationToken -> Task

VB

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<DoesServiceRequestAttribute>
Public Overridable Function UploadFromFileAsync (
	path As String,
	cancellationToken As CancellationToken
) As Task

Parameters

path

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

A string containing the file path providing the blob content.

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.TaskSystem.Threading.Tasks::Task^System.Threading.Tasks.TaskSystem.Threading.Tasks.Task

A Task object that represents the asynchronous operation.

Implements

ICloudBlob.::..UploadFromFileAsync(String, CancellationToken)(String^, CancellationToken)(String, CancellationToken)(String, CancellationToken)

Remarks

Use this method only in single-writer scenarios. Internally, this method uses the append-offset conditional header to avoid duplicate blocks, which may cause problems in multiple-writer scenarios. To append data to an append blob that already exists, see AppendFromFileAsync.

See Also

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

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