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CloudPageBlob.BeginOpenWrite Method (Nullable, AsyncCallback, Object)

Updated: May 15, 2014

Begins an asynchronous operation to open a stream for writing to the blob.

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

[DoesServiceRequestAttribute] 
public ICancellableAsyncResult BeginOpenWrite (
	Nullable<long> size,
	AsyncCallback callback,
	Object state
)

Parameters

size

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

callback

An AsyncCallback delegate that will receive notification when the asynchronous operation completes.

state

A user-defined object that will be passed to the callback delegate.

Return Value

An ICancellableAsyncResult that references the asynchronous operation.

Note that this method always makes a call to the BeginFetchAttributes(AccessCondition,BlobRequestOptions,OperationContext,AsyncCallback,Object) 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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