CloudAppendBlob.BeginUploadFromByteArray Method (Byte[], Int32, Int32, AsyncCallback, Object) (Microsoft.WindowsAzure.Storage.Blob)

Begins an asynchronous operation to upload the contents of a byte array to an append blob. If the blob already exists, it will be overwritten. 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 ICancellableAsyncResult BeginUploadFromByteArray(
	byte[] buffer,
	int index,
	int count,
	AsyncCallback callback,
	object state
)

C++

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public:
[DoesServiceRequestAttribute]
virtual ICancellableAsyncResult^ BeginUploadFromByteArray(
	array<unsigned char>^ buffer,
	int index,
	int count,
	AsyncCallback^ callback,
	Object^ state
)

F#

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[<DoesServiceRequestAttribute>]
abstract BeginUploadFromByteArray : 
        buffer:byte[] *
        index:int *
        count:int *
        callback:AsyncCallback *
        state:Object -> ICancellableAsyncResult
[<DoesServiceRequestAttribute>]
override BeginUploadFromByteArray : 
        buffer:byte[] *
        index:int *
        count:int *
        callback:AsyncCallback *
        state:Object -> ICancellableAsyncResult

VB

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<DoesServiceRequestAttribute>
Public Overridable Function BeginUploadFromByteArray (
	buffer As Byte(),
	index As Integer,
	count As Integer,
	callback As AsyncCallback,
	state As Object
) As ICancellableAsyncResult

Parameters

buffer

Type: System.Byte[]array<System::Byte>^System.Byte[]System.Byte()

An array of bytes.

index

Type: System.Int32System::Int32System.Int32System.Int32

The zero-based byte offset in buffer at which to begin uploading bytes to the blob.

count

Type: System.Int32System::Int32System.Int32System.Int32

The number of bytes to be written to the blob.

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.

Implements

ICloudBlob.::..BeginUploadFromByteArray(Byte[], Int32, Int32, AsyncCallback, Object)(array<Byte>^, Int32, Int32, AsyncCallback^, Object^)(Byte[], Int32, Int32, AsyncCallback, Object)(Byte(), Int32, Int32, AsyncCallback, Object)

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. To append data to an append blob that already exists, see BeginAppendFromByteArray.

See Also

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

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