C#实践录：代码片段-网络相关

csharp 204 字 次

一些与网络有关的代码片段。

TCP连接

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try
{
    // 连接上说明在线，使用AsyncWaitHandle连接，超时300ms
    var client = new TcpClient();
    var result = client.BeginConnect(dev.RFIDIP, CHostConfig.RFIDPort, null, null);
    var ret = result.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(300));
    if (ret) // 连接上，更新时间戳
    {
        client.EndConnect(result);
        dev.RFIDIPTime = Utils.GetTimeStampString();
    }
    else
    {
        //Console.WriteLine($"connect {dev.RFIDIP} ret: {ret}");
    }
}
catch (Exception e)
{
    //Console.WriteLine(e);
}

发送post请求

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public static void PostToServer(string url, string json)
{
    var request = (HttpWebRequest)WebRequest.Create(url);
    request.Method = "POST";
    request.ContentType = "application/json;charset=UTF-8";
    request.Timeout = 1000; // 超时为1秒，防止过久
    try
    {
        using (var streamWriter = new StreamWriter(request.GetRequestStream()))
        {
            streamWriter.Write(json);
            streamWriter.Flush();
            streamWriter.Close();
        }
        var httpResponse = (HttpWebResponse)request.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
            Console.WriteLine($"ret: {result}");
        }
    }
    catch (WebException e) // 连接不上，抛出异常
    {
        //Console.WriteLine(e);
    }
}