CloudPageBlob.BeginOpenWrite Method
Definition
Important
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Overloads
| BeginOpenWrite(Nullable<Int64>, AsyncCallback, Object) |
Begins an asynchronous operation to open a stream for writing to the blob. If the blob already exists, then existing data in the blob may be overwritten. |
| BeginOpenWrite(Nullable<Int64>, AccessCondition, BlobRequestOptions, OperationContext, AsyncCallback, Object) |
Begins an asynchronous operation to open a stream for writing to the blob. If the blob already exists, then existing data in the blob may be overwritten. |
BeginOpenWrite(Nullable<Int64>, AsyncCallback, Object)
Begins an asynchronous operation to open a stream for writing to the blob. If the blob already exists, then existing data in the blob may be overwritten.
[Microsoft.Azure.Storage.DoesServiceRequest]
public virtual Microsoft.Azure.Storage.ICancellableAsyncResult BeginOpenWrite (long? size, AsyncCallback callback, object state);[<Microsoft.Azure.Storage.DoesServiceRequest>]
abstract member BeginOpenWrite : Nullable<int64> * AsyncCallback * obj -> Microsoft.Azure.Storage.ICancellableAsyncResult
override this.BeginOpenWrite : Nullable<int64> * AsyncCallback * obj -> Microsoft.Azure.Storage.ICancellableAsyncResultPublic Overridable Function BeginOpenWrite (size As Nullable(Of Long), callback As AsyncCallback, state As Object) As ICancellableAsyncResultParameters
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
- 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
An ICancellableAsyncResult that references the asynchronous operation.
- Attributes
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 page size to write, in multiples of 512 bytes, ranging from between 512 and 4 MB inclusive.
To throw an exception if the blob exists instead of overwriting it, see BeginOpenWrite(Nullable<Int64>, AccessCondition, BlobRequestOptions, OperationContext, AsyncCallback, Object).
Applies to
BeginOpenWrite(Nullable<Int64>, AccessCondition, BlobRequestOptions, OperationContext, AsyncCallback, Object)
Begins an asynchronous operation to open a stream for writing to the blob. If the blob already exists, then existing data in the blob may be overwritten.
[Microsoft.Azure.Storage.DoesServiceRequest]
public virtual Microsoft.Azure.Storage.ICancellableAsyncResult BeginOpenWrite (long? size, 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 : Nullable<int64> * Microsoft.Azure.Storage.AccessCondition * Microsoft.Azure.Storage.Blob.BlobRequestOptions * Microsoft.Azure.Storage.OperationContext * AsyncCallback * obj -> Microsoft.Azure.Storage.ICancellableAsyncResult
override this.BeginOpenWrite : Nullable<int64> * Microsoft.Azure.Storage.AccessCondition * Microsoft.Azure.Storage.Blob.BlobRequestOptions * Microsoft.Azure.Storage.OperationContext * AsyncCallback * obj -> Microsoft.Azure.Storage.ICancellableAsyncResultPublic Overridable Function BeginOpenWrite (size As Nullable(Of Long), accessCondition As AccessCondition, options As BlobRequestOptions, operationContext As OperationContext, callback As AsyncCallback, state As Object) As ICancellableAsyncResultParameters
The size of the page blob, in bytes. The size must be a multiple of 512. If null, the page blob must already exist.
- 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
An ICancellableAsyncResult that references the asynchronous operation.
- Attributes
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 page size to write, in multiples of 512 bytes, ranging from between 512 and 4 MB inclusive.
To throw an exception if the blob exists instead of overwriting it, pass in an AccessCondition object generated using GenerateIfNotExistsCondition().
