CloudBlockBlob.BeginOpenWrite Method

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Definition

Namespace:
Microsoft.Azure.Storage.Blob
Assembly:
Microsoft.Azure.Storage.Blob.dll
Package:
Microsoft.Azure.Storage.Blob v11.2.3

Overloads

BeginOpenWrite(AccessCondition, BlobRequestOptions, OperationContext, AsyncCallback, Object)

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

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

BeginOpenWrite(AccessCondition, BlobRequestOptions, OperationContext, AsyncCallback, Object)

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

[Microsoft.Azure.Storage.DoesServiceRequest]
public virtual Microsoft.Azure.Storage.ICancellableAsyncResult BeginOpenWrite (Microsoft.Azure.Storage.AccessCondition accessCondition, Microsoft.Azure.Storage.Blob.BlobRequestOptions options, Microsoft.Azure.Storage.OperationContext operationContext, AsyncCallback callback, object state);
[<Microsoft.Azure.Storage.DoesServiceRequest>]
abstract member BeginOpenWrite : Microsoft.Azure.Storage.AccessCondition * Microsoft.Azure.Storage.Blob.BlobRequestOptions * Microsoft.Azure.Storage.OperationContext * AsyncCallback * obj -> Microsoft.Azure.Storage.ICancellableAsyncResult
override this.BeginOpenWrite : Microsoft.Azure.Storage.AccessCondition * Microsoft.Azure.Storage.Blob.BlobRequestOptions * Microsoft.Azure.Storage.OperationContext * AsyncCallback * obj -> Microsoft.Azure.Storage.ICancellableAsyncResult
Public Overridable Function BeginOpenWrite (accessCondition As AccessCondition, options As BlobRequestOptions, operationContext As OperationContext, callback As AsyncCallback, state As Object) As ICancellableAsyncResult

Parameters

accessCondition
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.

options
BlobRequestOptions

A BlobRequestOptions object that specifies additional options for the request.

operationContext
OperationContext

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

callback
AsyncCallback

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

state
Object

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

Returns

ICancellableAsyncResult

An ICancellableAsyncResult that references the asynchronous operation.

Attributes
DoesServiceRequestAttribute

Remarks

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 100 MB inclusive.

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

Applies to

BeginOpenWrite(AsyncCallback, Object)

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

[Microsoft.Azure.Storage.DoesServiceRequest]
public virtual Microsoft.Azure.Storage.ICancellableAsyncResult BeginOpenWrite (AsyncCallback callback, object state);
[<Microsoft.Azure.Storage.DoesServiceRequest>]
abstract member BeginOpenWrite : AsyncCallback * obj -> Microsoft.Azure.Storage.ICancellableAsyncResult
override this.BeginOpenWrite : AsyncCallback * obj -> Microsoft.Azure.Storage.ICancellableAsyncResult
Public Overridable Function BeginOpenWrite (callback As AsyncCallback, state As Object) As ICancellableAsyncResult

Parameters

callback
AsyncCallback

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

state
Object

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

Returns

ICancellableAsyncResult

An ICancellableAsyncResult that references the asynchronous operation.

Attributes
DoesServiceRequestAttribute

Remarks

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 100 MB inclusive.

To throw an exception if the blob exists instead of overwriting it, see BeginOpenWrite(AccessCondition, BlobRequestOptions, OperationContext, AsyncCallback, Object).

Applies to