Begins an asynchronous operation to upload a single block. Namespace: Microsoft.WindowsAzure.StorageClient
Assembly: Microsoft.WindowsAzure.StorageClient (in Microsoft.WindowsAzure.StorageClient.dll)
Usage
| Visual Basic |
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Dim instance As CloudBlockBlob Dim blockId As String Dim blockData As Stream Dim contentMD5 As String Dim callback As AsyncCallback Dim state As Object Dim returnValue As IAsyncResult returnValue = instance.BeginPutBlock(blockId, blockData, contentMD5, callback, state) |
Syntax
| Visual Basic |
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Public Function BeginPutBlock ( _ blockId As String, _ blockData As Stream, _ contentMD5 As String, _ callback As AsyncCallback, _ state As Object _ ) As IAsyncResult |
| C# |
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public IAsyncResult BeginPutBlock ( string blockId, Stream blockData, string contentMD5, AsyncCallback callback, Object state ) |
| C++ |
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public: IAsyncResult^ BeginPutBlock ( String^ blockId, Stream^ blockData, String^ contentMD5, AsyncCallback^ callback, Object^ state ) |
| J# |
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| JScript |
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Parameters
- blockId
Type: System.String
A base64-encoded block ID that identifies the block.
- blockData
Type: System.IO.Stream
A stream that provides the data for the block.
- contentMD5
Type: System.String
A hash value used to verify the integrity of the block. May be
nullor an empty string.
- callback
Type: System.AsyncCallback
The callback delegate that will receive notification when the asynchronous operation completes.
- state
Type: System.Object
A user-defined object that will be passed to the callback delegate.
Return Value
Type: System.IAsyncResultAn IAsyncResult that references the asynchronous operation.Remarks
The BeginPutBlock method begins an operation to upload a block for future inclusion in a block blob. A block may be up to 4 MB in size.
After you have uploaded a set of blocks, you can create or update the blob on the server from this set by calling the BeginPutBlockList method. Each block in the set is identified by a block ID that is unique within that blob. Block IDs are scoped to a particular blob, so different blobs can have blocks with same IDs.
If you call BeginPutBlock on a blob that does not yet exist, a new block blob is created with a content length of 0. This blob is enumerated by a blob listing operation if the UncommittedBlobs option is specified. The block or blocks that you uploaded are not committed until you commit the block list for the new blob. A blob created this way is maintained on the server for a week; if you have not added more blocks or committed blocks to the blob within that time period, then the blob is garbage collected.
The maximum block blob size currently supported is 200 GB, and up to 50,000 blocks. A blob can have a maximum of 100,000 uncommitted blocks at any given time, and the set of uncommitted blocks cannot exceed 400 GB in total size.
A block that has been successfully uploaded does not become part of a blob until it is committed with a call to BeginPutBlockList. Before the block list is committed to create a new blob or update an existing blob, an operation to return the blob's contents does not include the contents of the uncommitted block.
If you upload a block that has the same block ID as another block that has not yet been committed, the last uploaded block with that ID will be committed on the next successful call to BeginPutBlockList.
On calling BeginPutBlockList, all uncommitted blocks specified in the block list are committed as part of the new blob. Any uncommitted blocks that were not specified in the block list for the blob will be garbage collected and removed from the Blob service. Any uncommitted blocks will also be garbage collected if they are not committed within a week following the last successful block upload. If another write operation is performed on the blob, any uncommitted blocks will also be garbage collected.
For a given blob, all block IDs must be the same length, but the block contents can be of different size. If a block is uploaded with a block ID of a different length than the block IDs for any existing uncommitted blocks, an exception is thrown, with an error code of InvalidBlockId.
Calling BeginPutBlock does not update the last modified time of an existing blob.