CloudBlockBlob.OpenWriteAsync Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Overloads
| OpenWriteAsync(AccessCondition, BlobRequestOptions, OperationContext) |
Initiates an asynchronous operation to open a stream for writing to the blob. If the blob already exists, it will be overwritten. |
| OpenWriteAsync(AccessCondition, BlobRequestOptions, OperationContext, CancellationToken) |
Initiates an asynchronous operation to open a stream for writing to the blob. If the blob already exists, it will be overwritten. |
| OpenWriteAsync() |
Initiates an asynchronous operation to open a stream for writing to the blob. If the blob already exists, it will be overwritten. |
| OpenWriteAsync(CancellationToken) |
Initiates an asynchronous operation to open a stream for writing to the blob. If the blob already exists, it will be overwritten. |
OpenWriteAsync(AccessCondition, BlobRequestOptions, OperationContext)
Initiates 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 System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream> OpenWriteAsync (Microsoft.Azure.Storage.AccessCondition accessCondition, Microsoft.Azure.Storage.Blob.BlobRequestOptions options, Microsoft.Azure.Storage.OperationContext operationContext);[<Microsoft.Azure.Storage.DoesServiceRequest>]
abstract member OpenWriteAsync : Microsoft.Azure.Storage.AccessCondition * Microsoft.Azure.Storage.Blob.BlobRequestOptions * Microsoft.Azure.Storage.OperationContext -> System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream>
override this.OpenWriteAsync : Microsoft.Azure.Storage.AccessCondition * Microsoft.Azure.Storage.Blob.BlobRequestOptions * Microsoft.Azure.Storage.OperationContext -> System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream>Public Overridable Function OpenWriteAsync (accessCondition As AccessCondition, options As BlobRequestOptions, operationContext As OperationContext) As Task(Of CloudBlobStream)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.
Returns
A Task<TResult> object of type CloudBlobStream that represents the asynchronous operation.
- Attributes
Remarks
Note that this method always makes a call to the FetchAttributesAsync(AccessCondition, BlobRequestOptions, OperationContext, CancellationToken) 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
OpenWriteAsync(AccessCondition, BlobRequestOptions, OperationContext, CancellationToken)
Initiates 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 System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream> OpenWriteAsync (Microsoft.Azure.Storage.AccessCondition accessCondition, Microsoft.Azure.Storage.Blob.BlobRequestOptions options, Microsoft.Azure.Storage.OperationContext operationContext, System.Threading.CancellationToken cancellationToken);[<Microsoft.Azure.Storage.DoesServiceRequest>]
abstract member OpenWriteAsync : Microsoft.Azure.Storage.AccessCondition * Microsoft.Azure.Storage.Blob.BlobRequestOptions * Microsoft.Azure.Storage.OperationContext * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream>
override this.OpenWriteAsync : Microsoft.Azure.Storage.AccessCondition * Microsoft.Azure.Storage.Blob.BlobRequestOptions * Microsoft.Azure.Storage.OperationContext * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream>Public Overridable Function OpenWriteAsync (accessCondition As AccessCondition, options As BlobRequestOptions, operationContext As OperationContext, cancellationToken As CancellationToken) As Task(Of CloudBlobStream)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.
- cancellationToken
- CancellationToken
A CancellationToken to observe while waiting for a task to complete.
Returns
A Task<TResult> object of type CloudBlobStream that represents the asynchronous operation.
- Attributes
Remarks
Note that this method always makes a call to the FetchAttributesAsync(AccessCondition, BlobRequestOptions, OperationContext, CancellationToken) 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
OpenWriteAsync()
Initiates 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 System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream> OpenWriteAsync ();[<Microsoft.Azure.Storage.DoesServiceRequest>]
abstract member OpenWriteAsync : unit -> System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream>
override this.OpenWriteAsync : unit -> System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream>Public Overridable Function OpenWriteAsync () As Task(Of CloudBlobStream)Returns
A Task<TResult> object of type CloudBlobStream that represents the asynchronous operation.
- Attributes
Remarks
Note that this method always makes a call to the FetchAttributesAsync(AccessCondition, BlobRequestOptions, OperationContext, CancellationToken) 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 OpenWriteAsync(AccessCondition, BlobRequestOptions, OperationContext).
Applies to
OpenWriteAsync(CancellationToken)
Initiates 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 System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream> OpenWriteAsync (System.Threading.CancellationToken cancellationToken);[<Microsoft.Azure.Storage.DoesServiceRequest>]
abstract member OpenWriteAsync : System.Threading.CancellationToken -> System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream>
override this.OpenWriteAsync : System.Threading.CancellationToken -> System.Threading.Tasks.Task<Microsoft.Azure.Storage.Blob.CloudBlobStream>Public Overridable Function OpenWriteAsync (cancellationToken As CancellationToken) As Task(Of CloudBlobStream)Parameters
- cancellationToken
- CancellationToken
A CancellationToken to observe while waiting for a task to complete.
Returns
A Task<TResult> object of type CloudBlobStream that represents the asynchronous operation.
- Attributes
Remarks
Note that this method always makes a call to the FetchAttributesAsync(AccessCondition, BlobRequestOptions, OperationContext, CancellationToken) 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 OpenWriteAsync(AccessCondition, BlobRequestOptions, OperationContext, CancellationToken).
