使用CopyTo()通过TCP传输文件 [英] Transferring files over TCP with CopyTo()

问题描述

我对Stream类的CopyTo()方法有疑问:

I have a question regarding the CopyTo() method of the Stream class:

https://docs.microsoft.com /en-us/dotnet/api/system.io.stream.copyto

这种方法在我尝试的情况下适用于大约15kb的小文件，但适用于更高的文件(我测试了2mbs，4 mbs等)，并且仅挂在CopyTo()方法上.真的不知道为什么.

This approach works for small file circa 15kb as I tried it, but anything higher (I tested with 2mbs, 4 mbs and so on) and it just hangs on the CopyTo() method. Can't really figure out why.

代码示例:

服务器的句柄客户端:

public void HandleClient(object c)
{
    string path = "some path";
    using (TcpClient client = (TcpClient)c)
    {
        using (NetworkStream netStream = client.GetStream())
        {
            using (FileStream fileStream = new FileStream(path, FileMode.Create))
            {
                netStream.CopyTo(fileStream);
            }
        }
    }
}

客户端发送:

public void Send()
{
    IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Parse("some address"), 12345);
    string path = "some path";

    using (TcpClient client = new TcpClient(remoteEndPoint))
    {
        using (NetworkStream netStream = client.GetStream())
        {
            using (FileStream fileStream = new FileStream(path, FileMode.Open))
            {
                fileStream.CopyTo(netStream);
            }
        }
    }
}

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P.s.在研究网络编程的过程中，我经常发现有人建议其他人改用WCF来完成这类任务，因为WCF显然使一切变得容易得多.你们有什么建议，您能否为WCF noob提供一些链接，这些链接对建立LAN文件共享应用程序很有用，因为这就是我的目标?

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P.s. As I research my way into Network Programming, I often find people advising other people to switch to WCF for this kind of tasks since, apparently, WCF makes everything a lot easier. What do you guys suggest and could you provide some links for a WCF noob that would be useful in modeling a LAN file sharing application since that's what my goal is?

推荐答案

我设法解决了CopyTo()问题.问题是我在主线程上发送文件，因此整个应用程序都被塞满了较大的文件，这些文件花费了超过一瞬间的时间才能传输.

I managed to solve the CopyTo() issue. The problem was that I was sending the file on the main thread so the whole application just chocked for larger files that took more than an instant to transfer.

将发送操作放在一个单独的线程中，并测试了高达3 GB的发送，它应该可以正常工作.现在，有什么方法可以跟踪CopyTo()操作的进度?在我看来，我不能，并且如果我想跟踪进度，应该进行手动传输.

Put the sending operation in a separate thread and tested sending up to 3 GB, works as it should. Now, is there any way I could track the progress of the CopyTo() operation? Seems to me that I can't and that I should do manual transfer if I want to track the progress.

感谢所有参与的人:)

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