相关疑难解决方法(0)

我想知道在使用TPL TaskFactory.FromAsync和使用TaskFactory.StartNew阻塞版本的方法之间是否存在性能影响.我正在编写一个TCP服务器,它将支持不超过100个并发连接.在使用第一个选项编写代码并使用continue来链接多个读写操作之后,我留下了丑陋,难以调试的代码.

我相信用同步版本编写代码然后用Task包装它会降低复杂性并提高可测试性,但是我担心这样做的性能影响.

例如,这两个调用之间是否存在任何性能差异:

NetworkStream stream;
byte[] data;
int bytesRead;

//using FromAsync
Task<int> readChunk = Task<int>.Factory.FromAsync (
      stream.BeginRead, stream.EndRead,
      data, bytesRead, data.Length - bytesRead, null);

//using StartNew with blocking version
Task<int> readChunk2 = Task<int>.Factory.StartNew(() => 
      stream.Read(data, bytesRead, data.Length - bytesRead));

我对C#比较新,所以请耐心等待.

我试图了解Task FromAsync的工作原理.

var task1 = Task<int>.Factory.FromAsync(Foo1, ...);  //what happens here? Is this 
called on a thread from threadpool?

SomeCode1(); // <- is this code executed in parallel with Foo1

task1.ContinueWith(Foo2,...);   //does this block the current thread until Foo1
 finishes? Shouldn't it act like a callback? If this whole code runs on a "normal"
thread does it block it? If this runs on a thread from a thread pool does it 
 release the thread until Foo1 finishes?

SomeCode2();  

谢谢你的帮助,我真的在努力学习异步编程.