Question

如何更换标签？我这样试试：

foreach (var url in urlList)
            {
                try
                {
                    stopwatch.Start();
                    requester.DownloadString(url);
                    url.Replace("\n",string.Empty);
                    if (url.Contains("/select/"))
                    {
                        url.Replace(string.Empty, "?");
                    }


                }
                catch (Exception e)
                {
                    Console.WriteLine("An error occured while attempting to connect to {0}", url);
                }
                finally
                {
                    stopwatch.Stop();

                    //We use the counter for a friendlier url as the current ones are unwieldly
                    times.Add("Url " + counter, stopwatch.Elapsed);
                    counter++;

                    stopwatch.Reset();
                }
            }

但是这个：url.Replace（“\ n”，“？”）;不做这个工作。那么如何管理呢？我的帖子有很多代码。但我没有要输入的文字

谢谢

这是完整的代码：

public class Program
    {
        static void Main(string[] args)
        {

            //Consider making this configurable
            const string sourceFile = "testSolar.txt";

            var requester = new WebClient();
            var times = new Dictionary<string, TimeSpan>();
            var stopwatch = new System.Diagnostics.Stopwatch();

            //Add header so if headers are tracked, it will show it is your application rather than something ambiguous
            requester.Headers.Add(HttpRequestHeader.UserAgent, "Response-Tester-Client");

            var urlList = new List<string>();

            //Loop through the lines in the file to get the urls 
            try
            {
                stopwatch.Start();
                using (var reader = new StreamReader(sourceFile))
                {

                    while (!reader.EndOfStream)
                    {
                        urlList.Add(reader.ReadLine());
                        urlList.Remove("\n");

                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("An error occured while attempting to access the source file at {0}", sourceFile);
            }
            finally
            {
                //Stop, record and reset the stopwatch
                stopwatch.Stop();
                times.Add("FileReadTime", stopwatch.Elapsed);
                stopwatch.Reset();
            }

            //Try to connect to each url
            var counter = 1;
            foreach (var url in urlList)
            {
                try
                {
                    stopwatch.Start();
                    requester.DownloadString(url);
                     url.Replace("\t","?");
                    if (url.Contains("/select/"))
                    {
                        url.Replace(string.Empty, "?");
                    }


                }
                catch (Exception e)
                {
                    Console.WriteLine("An error occured while attempting to connect to {0}", url);
                }
                finally
                {
                    stopwatch.Stop();

                    //We use the counter for a friendlier url as the current ones are unwieldly
                    times.Add("Url " + counter, stopwatch.Elapsed);
                    counter++;

                    stopwatch.Reset();
                }
            }

            //Release the resources for the WebClient 
            requester.Dispose();

            //Write the response times
            foreach (var key in times.Keys)
            {
                Console.WriteLine("{0}: {1}", key, times[key].TotalSeconds);
            }


            Console.ReadKey();
        }
    }

这是在做这项工作：

while (!reader.EndOfStream)
                    {
                        var line = reader.ReadLine();
                        line =  line.Replace("\t", "?");
                        urlList.Add(line);
                    }

Answer 1

这里的问题是你没有将字符串重新分配给变量：

url = url.Replace("\n",string.Empty);

并替换标签try \ t，如其他人所述：

url = url.Replace("\t","?");

Answer 2

标签字符串由\t表示。因此，如果您想用问号替换制表符：

url.Replace("\t","?");

应该做的工作。

编辑：是的，正如Zaheer Ahmed解释的那样，你还需要重新影响Replace函数的结果......

如何更换标签？

2 个答案: