CloudAppendBlob.AppendFromFileAsync Method (String, AccessCondition, BlobRequestOptions, OperationContext) (Microsoft.WindowsAzure.Storage.Blob)

Initiates an asynchronous operation to append a file to an append blob. 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 AppendFromFileAsync(
	string path,
	AccessCondition accessCondition,
	BlobRequestOptions options,
	OperationContext operationContext
)

C++

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public:
[DoesServiceRequestAttribute]
virtual Task^ AppendFromFileAsync(
	String^ path,
	AccessCondition^ accessCondition,
	BlobRequestOptions^ options,
	OperationContext^ operationContext
)

F#

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[<DoesServiceRequestAttribute>]
abstract AppendFromFileAsync : 
        path:string *
        accessCondition:AccessCondition *
        options:BlobRequestOptions *
        operationContext:OperationContext -> Task
[<DoesServiceRequestAttribute>]
override AppendFromFileAsync : 
        path:string *
        accessCondition:AccessCondition *
        options:BlobRequestOptions *
        operationContext:OperationContext -> Task

VB

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<DoesServiceRequestAttribute>
Public Overridable Function AppendFromFileAsync (
	path As String,
	accessCondition As AccessCondition,
	options As BlobRequestOptions,
	operationContext As OperationContext
) As Task

Parameters

path

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

A string containing the file path providing the blob content.

accessCondition

Type: Microsoft.WindowsAzure.Storage.AccessConditionMicrosoft.WindowsAzure.Storage::AccessCondition^Microsoft.WindowsAzure.Storage.AccessConditionMicrosoft.WindowsAzure.Storage.AccessCondition

An AccessCondition object that represents the condition that must be met in order for the request to proceed.

options

Type: Microsoft.WindowsAzure.Storage.Blob.BlobRequestOptionsMicrosoft.WindowsAzure.Storage.Blob::BlobRequestOptions^Microsoft.WindowsAzure.Storage.Blob.BlobRequestOptionsMicrosoft.WindowsAzure.Storage.Blob.BlobRequestOptions

A BlobRequestOptions object that specifies additional options for the request.

operationContext

Type: Microsoft.WindowsAzure.Storage.OperationContextMicrosoft.WindowsAzure.Storage::OperationContext^Microsoft.WindowsAzure.Storage.OperationContextMicrosoft.WindowsAzure.Storage.OperationContext

An OperationContext object that represents the context for the current operation.

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.

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. If you have a single-writer scenario, see AbsorbConditionalErrorsOnRetryAbsorbConditionalErrorsOnRetryAbsorbConditionalErrorsOnRetryAbsorbConditionalErrorsOnRetry to determine whether setting this flag to true is acceptable for your scenario.

See Also

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

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