Storage Client Library for Windows Phone (Version 7.0)

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)

Syntax

C#

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

C++

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

F#

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[<DoesServiceRequestAttribute>]
abstract BeginOpenWrite : 
        size:Nullable<int64> *
        callback:AsyncCallback *
        state:Object -> ICancellableAsyncResult
[<DoesServiceRequestAttribute>]
override BeginOpenWrite : 
        size:Nullable<int64> *
        callback:AsyncCallback *
        state:Object -> ICancellableAsyncResult

VB

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<DoesServiceRequestAttribute>
Public Overridable Function BeginOpenWrite (
	size As Nullable(Of Long),
	callback As AsyncCallback,
	state As Object
) As ICancellableAsyncResult

Parameters

size

Type: System.Nullable<Int64>System::Nullable<Int64>System.Nullable<Int64>System.Nullable(Of Int64)

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

Type: System.AsyncCallbackSystem::AsyncCallback^System.AsyncCallbackSystem.AsyncCallback

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

state

Type: System.ObjectSystem::Object^System.ObjectSystem.Object

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

Return Value

Type: Microsoft.WindowsAzure.Storage.ICancellableAsyncResultMicrosoft.WindowsAzure.Storage::ICancellableAsyncResult^Microsoft.WindowsAzure.Storage.ICancellableAsyncResultMicrosoft.WindowsAzure.Storage.ICancellableAsyncResult

An ICancellableAsyncResult that references the asynchronous operation.

Remarks

Note that this method always makes a call to the Referenced topic '334f74fc-1383-49aa-bb6b-6ec4e93ffb6d' is not in the TOC. method under the covers.

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

See Also

BeginOpenWrite Overload
CloudPageBlob Class
Microsoft.WindowsAzure.Storage.Blob Namespace

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