C# Azure blob存储V12-使用专用类BlockBlob存储的示例
我很难接受新版本的 我需要的是创建流,我可以在其中写入数据,比如说,流达到4MB大小后,我需要上传它。我找到了。有两种方法CommitBlockListAsync和StageBlockAsync。这个方法看起来像我需要的,但是我找不到一些用法的例子 你知道一些类似于我需求的场景吗?或者你能帮我了解一下这个客户吗 我需要这样的东西,每个4MB阶段,清除流并继续写:C# Azure blob存储V12-使用专用类BlockBlob存储的示例,c#,azure-storage-blobs,C#,Azure Storage Blobs,我很难接受新版本的 我需要的是创建流,我可以在其中写入数据,比如说,流达到4MB大小后,我需要上传它。我找到了。有两种方法CommitBlockListAsync和StageBlockAsync。这个方法看起来像我需要的,但是我找不到一些用法的例子 你知道一些类似于我需求的场景吗?或者你能帮我了解一下这个客户吗 我需要这样的东西,每个4MB阶段,清除流并继续写: public class MyStreamWrapper : Stream { readonly BlockBlobClien
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);
}
}
对于没有出现在samples文件夹中的api,请查看测试 乙二醇
还要熟悉RESTAPI,客户机库是它的包装器。您使用的是一种较低级别的API方法,它直接映射到和REST API。谢谢您的帮助。从测试中我看到了如何使用它。
[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);
}