您将需要使用NetStream读取的回调来处理此问题。坦率地说，将复制逻辑包装到其自己的类中可能会更容易，以便您可以维护活动Streams的实例。
这是我的处理方式（未经测试）：
public class Assignment1
{
public static void NetToFile(NetworkStream net, FileStream file)
{
var copier = new AsyncStreamCopier(net, file);
copier.Start();
}
public static void NetToFile_Option2(NetworkStream net, FileStream file)
{
var completedEvent = new ManualResetEvent(false);
// copy as usual but listen for completion
var copier = new AsyncStreamCopier(net, file);
copier.Completed += (s, e) => completedEvent.Set();
copier.Start();
completedEvent.WaitOne();
}
/// <summary>
/// The Async Copier class reads the input Stream Async and writes Synchronously
/// </summary>
public class AsyncStreamCopier
{
public event EventHandler Completed;
private readonly Stream input;
private readonly Stream output;
private byte[] buffer = new byte[4096];
public AsyncStreamCopier(Stream input, Stream output)
{
this.input = input;
this.output = output;
}
public void Start()
{
GetNextChunk();
}
private void GetNextChunk()
{
input.BeginRead(buffer, 0, buffer.Length, InputReadComplete, null);
}
private void InputReadComplete(IAsyncResult ar)
{
// input read asynchronously completed
int bytesRead = input.EndRead(ar);
if (bytesRead == 0)
{
RaiseCompleted();
return;
}
// write synchronously
output.Write(buffer, 0, bytesRead);
// get next
GetNextChunk();
}
private void RaiseCompleted()
{
if (Completed != null)
{
Completed(this, EventArgs.Empty);
}
}
}
}
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