CloudAppendBlob.BeginAppendBlock Method (Stream, String, AsyncCallback, Object) (Microsoft.WindowsAzure.Storage.Blob)
From Microsoft Windows Azure Storage Blob
Begins an asynchronous operation to commit a new block of data to the end of the blob.
Namespace:
Microsoft.WindowsAzure.Storage.Blob
Assembly:
Microsoft.WindowsAzure.Storage (in Microsoft.WindowsAzure.Storage.dll)
Syntax
[DoesServiceRequestAttribute]
public virtual ICancellableAsyncResult BeginAppendBlock(
Stream blockData,
string contentMD5,
AsyncCallback callback,
object state
)
C++public:
[DoesServiceRequestAttribute]
virtual ICancellableAsyncResult^ BeginAppendBlock(
Stream^ blockData,
String^ contentMD5,
AsyncCallback^ callback,
Object^ state
)
[<DoesServiceRequestAttribute>]
abstract BeginAppendBlock :
blockData:Stream *
contentMD5:string *
callback:AsyncCallback *
state:Object -> ICancellableAsyncResult
[<DoesServiceRequestAttribute>]
override BeginAppendBlock :
blockData:Stream *
contentMD5:string *
callback:AsyncCallback *
state:Object -> ICancellableAsyncResult
<DoesServiceRequestAttribute>
Public Overridable Function BeginAppendBlock (
blockData As Stream,
contentMD5 As String,
callback As AsyncCallback,
state As Object
) As ICancellableAsyncResult
Parameters
- blockData
-
Type:
System.IO.StreamSystem.IO::Stream^System.IO.StreamSystem.IO.Stream
A Stream object that provides the data for the block.
- contentMD5
-
Type:
System.StringSystem::String^System.StringSystem.String
An optional hash value used to ensure transactional integrity for the block. May be null or an empty string.
- 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.ICancellableAsyncResultAn ICancellableAsyncResult that references the asynchronous operation.
Remarks
Clients may send the Content-MD5 header for a given Append Block operation as a means to ensure transactional integrity over the wire.
The contentMD5 parameter permits clients who already have access to a pre-computed MD5 value for a given byte range to provide it.
If the P:BlobRequestOptions.UseTransactionalMd5Referenced topic's target id should not be empty. Article id: 91df60a0-dc15-4330-81e9-c6402b9aa2f7, link: P:BlobRequestOptions.UseTransactionalMd5. property is set to true and the contentMD5 parameter is set
to null, then the client library will calculate the MD5 value internally.
Return to top
Begins an asynchronous operation to commit a new block of data to the end of the blob.
Syntax
[DoesServiceRequestAttribute] public virtual ICancellableAsyncResult BeginAppendBlock( Stream blockData, string contentMD5, AsyncCallback callback, object state )
public: [DoesServiceRequestAttribute] virtual ICancellableAsyncResult^ BeginAppendBlock( Stream^ blockData, String^ contentMD5, AsyncCallback^ callback, Object^ state )
[<DoesServiceRequestAttribute>] abstract BeginAppendBlock : blockData:Stream * contentMD5:string * callback:AsyncCallback * state:Object -> ICancellableAsyncResult [<DoesServiceRequestAttribute>] override BeginAppendBlock : blockData:Stream * contentMD5:string * callback:AsyncCallback * state:Object -> ICancellableAsyncResult
<DoesServiceRequestAttribute> Public Overridable Function BeginAppendBlock ( blockData As Stream, contentMD5 As String, callback As AsyncCallback, state As Object ) As ICancellableAsyncResult
Parameters
- blockData
-
Type:
System.IO.StreamSystem.IO::Stream^System.IO.StreamSystem.IO.Stream
A Stream object that provides the data for the block.
- contentMD5
-
Type:
System.StringSystem::String^System.StringSystem.String
An optional hash value used to ensure transactional integrity for the block. May be null or an empty string.
- 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.ICancellableAsyncResultAn ICancellableAsyncResult that references the asynchronous operation.
Remarks
Clients may send the Content-MD5 header for a given Append Block operation as a means to ensure transactional integrity over the wire. The contentMD5 parameter permits clients who already have access to a pre-computed MD5 value for a given byte range to provide it. If the P:BlobRequestOptions.UseTransactionalMd5Referenced topic's target id should not be empty. Article id: 91df60a0-dc15-4330-81e9-c6402b9aa2f7, link: P:BlobRequestOptions.UseTransactionalMd5. property is set to true and the contentMD5 parameter is set to null, then the client library will calculate the MD5 value internally.