Question

我目前正在创建一个C＃应用程序，以连接到php / MySQL在线系统。应用程序需要将后期数据发送到脚本并获得响应。

当我发送以下数据时

username=test&password=test

我收到以下回复......

Starting request at 22/04/2010 12:15:42  
Finished creating request : took 00:00:00.0570057  
Transmitting data at 22/04/2010 12:15:42  
Transmitted the data : took 00:00:06.9316931       <<--
Getting the response at 22/04/2010 12:15:49  
Getting response 00:00:00.0360036  
Finished response 00:00:00.0360036  
Entire call took 00:00:07.0247024

正如您所看到的，实际将数据发送到脚本需要6秒钟，我已经做了进一步测试，从telnet发送数据并将发布数据从本地文件发送到网址，他们甚至不需要一秒钟所以这不是网站上托管脚本的问题。

为什么在两个简单字符串时传输数据需要6秒钟？

我使用自定义类来发送数据

class httppostdata
{
    WebRequest request;
    WebResponse response;

    public string senddata(string url, string postdata)
    {
        var start = DateTime.Now;
        Console.WriteLine("Starting request at " + start.ToString());

        // create the request to the url passed in the paramaters
        request = (WebRequest)WebRequest.Create(url);


        // set the method to post
        request.Method = "POST";
        // set the content type and the content length
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = postdata.Length;
        // convert the post data into a byte array
        byte[] byteData = Encoding.UTF8.GetBytes(postdata);
        var end1 = DateTime.Now;
        Console.WriteLine("Finished creating request : took " + (end1 - start));

        var start2 = DateTime.Now;
        Console.WriteLine("Transmitting data at " + start2.ToString());
        // get the request stream and write the data to it
        Stream dataStream = request.GetRequestStream();
        dataStream.Write(byteData, 0, byteData.Length);
        dataStream.Close();
        var end2 = DateTime.Now;
        Console.WriteLine("Transmitted the data : took " + (end2 - start2));


        // get the response
        var start3 = DateTime.Now;
        Console.WriteLine("Getting the response at " + start3.ToString());


        response = request.GetResponse();
        //Console.WriteLine(((WebResponse)response).StatusDescription);
        dataStream = response.GetResponseStream();
        StreamReader reader = new StreamReader(dataStream);
        var end3 = DateTime.Now;
        Console.WriteLine("Getting response " + (end3 - start3));

        // read the response
        string serverresponse = reader.ReadToEnd();
        var end3a = DateTime.Now;
        Console.WriteLine("Finished response " + (end3a - start3));

        Console.WriteLine("Entire call took " + (end3a - start));

        //Console.WriteLine(serverresponse);
        reader.Close();
        dataStream.Close();
        response.Close();

        return serverresponse;
    }
}

并且我称之为

private void btnLogin_Click(object sender, EventArgs e)
{
    // string postdata;

    if (txtUsername.Text.Length < 3 || txtPassword.Text.Length < 3)
    {
        MessageBox.Show("Missing your username or password.");
    }
    else
    {
        string postdata = "username=" + txtUsername.Text +
                          "&password=" + txtPassword.Text;

        httppostdata myPost = new httppostdata();
        string response = myPost.senddata("http://www.domainname.com/scriptname.php", postdata);
        MessageBox.Show(response);
    }
}

Answer 1

确保将WebRequest的代理属性显式设置为null，否则它将尝试自动检测可能需要一些时间的代理设置。

Answer 2

有可能因为，在你的测试中，你只调用一次，你看到的延迟是C＃代码被JIT编译。

更好的测试是两次调用，并从第一次丢弃时间，看看它们是否更好。

更好的测试是放弃第一组时间，然后多次运行并取平均值，但对于非常松散的“指示性”视图，这可能不是必需的。

顺便说一下，对于这种时间安排，你最好使用System.Diagnostics.Stopwatch类而不是System.DateTime。

<强> [编辑] 另外，注意到Mant101关于代理的建议，如果设置无代理无法解决问题，您可能希望设置Fiddler并将您的请求设置为使用Fiddler作为其代理。这将允许您拦截实际的http调用，以便您可以从框架外部更好地细分http调用时间。

为什么使用WebRequest发送帖子数据需要这么长时间？

2 个答案: