C# 读写文件----修改配置文件StreamWriter streamw = new StreamWriter(fs)

1988_1989 2013-02-19 04:59:04

配置文件中：
a=1
b=2
修改配置：结果如下：
a=3
b=4

方法是这样写的：

String ReadTxt,WriteTxt;

                WriteTxt= String.Empty;

                //if (!File.Exists(path))

                //{

                //    using (StreamWriter streamwc = File.CreateText(path))

                //    {

                //        streamwc.Close();

                //    }

                //}

                //FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None);

                //StreamWriter sw = new StreamWriter(path,false);



                using (StreamReader sr = new StreamReader(path, System.Text.Encoding.Default))

                {

                    ReadTxt = sr.ReadToEnd();

                }

                String[] FileRead = System.Text.RegularExpressions.Regex.Split(ReadTxt , "\r\n");

                foreach(String ReadLine in FileRead)

                {

                    if (ReadLine.Contains("="))

                    {

                        string subStr = ReadLine.Substring(0, ReadLine.LastIndexOf('='));

                        string keyStr = Key ;

                        if (subStr.Equals(keyStr))

                        {

                              WriteTxt += ReadLine.Substring(0, ReadLine.LastIndexOf('='))  +"="+value;

                              FileStream fs = new System.IO.FileStream(path,FileMode.Open, System.IO.FileAccess.Read, FileShare.ReadWrite);

                             

                              using (StreamWriter streamw = new StreamWriter(fs))

                              {

                                  streamw.WriteLine( WriteTxt);

                                  fs.Close();

                                  streamw.Flush();

                                  streamw.Close();

                              }



                              //sw.Write(WriteTxt);

                              //sw.Dispose();

                        }

                    }

                }