[英]Azure blob storage V12 - Example of using specialized class BlockBlobStorage
我很難使用適用於 .NET 的新版Azure Storage Blob 客戶端庫。
我需要的是創建流,我可以在其中寫入數據,假設流達到 4MB 大小后,我需要上傳它。 我找到了BlockBlobClient 。 有兩種方法 CommitBlockListAsync 和 StageBlockAsync。 這種方法看起來像我需要的,但我找不到一些使用示例。
你知道一些類似於我的需求的場景嗎? 或者你能幫我了解這個客戶嗎?
我需要這樣的東西,每4MB階段,清除流並繼續編寫:
public class MyStreamWrapper : Stream
{
readonly BlockBlobClient _blockBlobClient;
readonly Stream _wrappedStream;
bool _isCommited;
readonly List<string> _blockIds;
public MyStreamWrapper (BlockBlobClient blockBlobClient)
{
_wrappedStream = new MemoryStream();
_blockBlobClient = blockBlobClient;
_isCommited = false;
_blockIds = new List<string>();
}
public override async Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
if ((_wrappedStream.Length + buffer.Length) / 1024 > 4) // check size if
{
int byteCount = (int)(_wrappedStream.Length - buffer.Length);
if (byteCount > 0)
{
_wrappedStream.Write(buffer, offset, byteCount);
offset += byteCount;
}
string base64Id = Convert.ToBase64String(buffer);
_blockIds.Add(base64Id);
_blockBlobClient.StageBlock(base64Id, _wrappedStream);
_wrappedStream.Flush();
}
await _wrappedStream.WriteAsync(buffer, offset, count, cancellationToken);
}
}
對於未出現在示例文件夾中的 API,請查看測試。
例如
[Test]
public async Task CommitBlockListAsync()
{
await using DisposingContainer test = await GetTestContainerAsync();
// Arrange
BlockBlobClient blob = InstrumentClient(test.Container.GetBlockBlobClient(GetNewBlobName()));
var data = GetRandomBuffer(Size);
var firstBlockName = GetNewBlockName();
var secondBlockName = GetNewBlockName();
var thirdBlockName = GetNewBlockName();
// Act
// Stage blocks
using (var stream = new MemoryStream(data))
{
await blob.StageBlockAsync(ToBase64(firstBlockName), stream);
}
using (var stream = new MemoryStream(data))
{
await blob.StageBlockAsync(ToBase64(secondBlockName), stream);
}
// Commit first two Blocks
var commitList = new string[]
{
ToBase64(firstBlockName),
ToBase64(secondBlockName)
};
await blob.CommitBlockListAsync(commitList);
// Stage 3rd Block
using (var stream = new MemoryStream(data))
{
await blob.StageBlockAsync(ToBase64(thirdBlockName), stream);
}
// Assert
Response<BlockList> blobList = await blob.GetBlockListAsync(BlockListTypes.All);
Assert.AreEqual(2, blobList.Value.CommittedBlocks.Count());
Assert.AreEqual(ToBase64(firstBlockName), blobList.Value.CommittedBlocks.First().Name);
Assert.AreEqual(ToBase64(secondBlockName), blobList.Value.CommittedBlocks.ElementAt(1).Name);
Assert.AreEqual(1, blobList.Value.UncommittedBlocks.Count());
Assert.AreEqual(ToBase64(thirdBlockName), blobList.Value.UncommittedBlocks.First().Name);
}
還要熟悉 REST API,客戶端庫是其包裝器。 您正在使用“較低級別”的 API 方法,該方法直接映射到Put Block和Put Block List REST API。
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