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CloudPageBlob.OpenWrite Method

Updated: May 15, 2014

Opens a stream for writing to the blob.

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

CloudBlobStream^ OpenWrite (
	Nullable<long long> size, 
	[OptionalAttribute] AccessCondition^ accessCondition, 
	[OptionalAttribute] BlobRequestOptions^ options, 
	[OptionalAttribute] OperationContext^ operationContext



The size of the page blob, in bytes. The size must be a multiple of 512. If null, the page blob must already exist.


An AccessCondition object that represents the condition that must be met in order for the request to proceed. If null, no condition is used.


A BlobRequestOptions object that specifies additional options for the request. If null, default options are applied to the request.


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

Return Value

A CloudBlobStream object.

Note that this method always makes a call to the FetchAttributes method under the covers.

Set the StreamWriteSizeInBytes property before calling this method to specify the block size to write, in bytes, ranging from between 16 KB and 4 MB inclusive.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Development Platforms

Windows Vista, Windows 7, Windows Server 2008, Windows 8.1, Windows Server 2012 R2, Windows 8 and Windows Server 2012


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