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BeginOpenWrite Method (AccessCondition, BlobRequestOptions, OperationContext, AsyncCallback, Object)
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CloudBlockBlob.BeginOpenWrite Method (AccessCondition, BlobRequestOptions, OperationContext, AsyncCallback, Object)


Updated: July 12, 2016

Begins an asynchronous operation to open a stream for writing to the blob. If the blob already exists, it will be overwritten.

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

public virtual ICancellableAsyncResult BeginOpenWrite(
	AccessCondition accessCondition,
	BlobRequestOptions options,
	OperationContext operationContext,
	AsyncCallback callback,
	object state


Type: Microsoft.WindowsAzure.Storage.AccessCondition

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

Type: Microsoft.WindowsAzure.Storage.Blob.BlobRequestOptions

A BlobRequestOptions object that specifies additional options for the request.

Type: Microsoft.WindowsAzure.Storage.OperationContext

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

Type: System.AsyncCallback

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

Type: System.Object

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

Return Value

Type: Microsoft.WindowsAzure.Storage.ICancellableAsyncResult

An ICancellableAsyncResult that references the asynchronous operation.

Note that this method always makes a call to the BeginFetchAttributes 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.

To throw an exception if the blob exists instead of overwriting it, pass in an AccessCondition object generated using GenerateIfNotExistsCondition.

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