Question

如何构造以下代码，以便我可以读取块中的所有流。目前它不断返回相同的数据。无法前进。

public static IObservable<byte[]> AsyncRead(this Stream stream, int bufferSize)
{
    var asyncRead = Observable.FromAsyncPattern<byte[], int, int, int>(stream.BeginRead, stream.EndRead);

    var buffer = new byte[bufferSize];

    return asyncRead(buffer, 0, bufferSize)
        .Select(cbRead =>
                    {
                        var dataChunk = new byte[cbRead];

                        Buffer.BlockCopy(buffer, 0, dataChunk, 0, cbRead);

                        return dataChunk;
                    })
        .Repeat()
        .TakeWhile(dataChunk => dataChunk.Length > 0);
}

Answer 1

同样陷入同样的陷阱。异步流的行为类似于可重放的流。虽然它只包含那一项。要解决此问题，请将其包含在Defer中，如下所示

Observable.Defer(() => asyncRead(buffer, 0, bufferSize))
...

从流中异步重复读取？

1 个答案: