Storage Client Library for Windows Phone (Version 7.0)

Begins an asynchronous operation to write pages to a page 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 BeginWritePages(
	Stream pageData,
	long startOffset,
	string contentMD5,
	AsyncCallback callback,
	object state
)

C++

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public:
[DoesServiceRequestAttribute]
virtual ICancellableAsyncResult^ BeginWritePages(
	Stream^ pageData,
	long long startOffset,
	String^ contentMD5,
	AsyncCallback^ callback,
	Object^ state
)

F#

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[<DoesServiceRequestAttribute>]
abstract BeginWritePages : 
        pageData:Stream *
        startOffset:int64 *
        contentMD5:string *
        callback:AsyncCallback *
        state:Object -> ICancellableAsyncResult
[<DoesServiceRequestAttribute>]
override BeginWritePages : 
        pageData:Stream *
        startOffset:int64 *
        contentMD5:string *
        callback:AsyncCallback *
        state:Object -> ICancellableAsyncResult

VB

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<DoesServiceRequestAttribute>
Public Overridable Function BeginWritePages (
	pageData As Stream,
	startOffset As Long,
	contentMD5 As String,
	callback As AsyncCallback,
	state As Object
) As ICancellableAsyncResult

Parameters

pageData

Type: System.IO.StreamSystem.IO::Stream^System.IO.StreamSystem.IO.Stream

A Stream object providing the page data.

startOffset

Type: System.Int64System::Int64System.Int64System.Int64

The offset at which to begin writing, in bytes. The offset must be a multiple of 512.

contentMD5

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

An optional hash value used to ensure transactional integrity for the page. May be null or an empty string.

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

Clients may send the Content-MD5 header for a given Write Pages operation as a means to ensure transactional integrity over the wire. The contentMD5 parameter permits clients who already have access to a pre-computed MD5 value for a given byte range to provide it. If the P:BlobRequestOptions.UseTransactionalMd5Referenced topic's target id should not be empty. Article id: 68aab9e4-931c-4e60-b8d5-6df08fadf00d, link: P:BlobRequestOptions.UseTransactionalMd5. property is set to true and the contentMD5 parameter is set to null, then the client library will calculate the MD5 value internally.

See Also

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

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