摘要：
C#修改文件内容和过滤有效内容，文件格式一定。=null){try{//FileStreamfs=newFileStream;//读StreamReadersr=newStreamReader;stringtext="";//读出来即将要写入的内容stringline=sr.ReadLine();while(line!=null){if{stringcheckS="";//1.更改地址line=line.Replace;//2.去除原来的checkSumline=line.Substring;//3.计算checkSumcheckS=checkSum;line=line+checkS;Console.WriteLine;text+=line+"";}else{}line=sr.ReadLine();}sr.Close();sr.Dispose();//更改保存文本StreamWritersw=newStreamWriter;sw.WriteLine;sw.Close();sw.Dispose();//fs.Close();//fs.Dispose();}catch{MessageBox.Show;}strFilePath=file.FileName;}else{return;}}checkSum的算法实现publicstringcheckSum//计算文件一行的校验和返回string为校验和结果一字节{stringchecksum=null;intsum=0;string[]shu=newstring[line.Length/2];for{shu[i]=line.Substring;sum+=Convert.ToInt32;}intjieguo=255-sum;stringhe=Convert.ToString.PadLeft;checksum=he.Substring.ToUpper();returnchecksum;}C#替换文本内容，数据量不太大的话直接Replace为""。usingSystem.IO;//读取文本 StreamReadersr=newStreamReader;stringstr=sr.ReadToEnd();sr.Close();//替换文本str=str.Replace;//更改保存文本StreamWritersw=newStreamWriter;sw.WriteLine;sw.Close();C#删除文件内容，用正则表达式strings=File.ReadAllText;stringr=Regex.Replace(s,@"(?
C#修改文件内容和过滤有效内容，文件格式一定。
OpenFileDialog file = new OpenFileDialog();//定义新的文件打开位置控件 file.InitialDirectory =Application.StartupPath; file.Filter = "mot file(*.mot)|*.mot|hex file(*.hex)|*.hex|s19 files(*.s19)|*.s19"; file.FilterIndex = 0; file.RestoreDirectory = true; if (file.ShowDialog() ==DialogResult.OK) { if (file.FileName != null) { try{ //FileStream fs = new FileStream(file.FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); //读 StreamReader sr = newStreamReader(file.FileName); string text = "";//读出来即将要写入的内容 string line =sr.ReadLine(); while (line != null) { if (line.Contains("S3")) { string checkS = ""; //1.更改地址 line = line.Replace("S32508FB", "S32500FB"); //2.去除原来的checkSum line = line.Substring(0, line.Length - 2); //3.计算checkSum checkS =checkSum(line); line = line +checkS; Console.WriteLine(line); text += line + " "; } else{ } line =sr.ReadLine(); } sr.Close(); sr.Dispose(); //更改保存文本 StreamWriter sw = new StreamWriter(file.FileName, false); sw.WriteLine(text); sw.Close(); sw.Dispose(); //fs.Close(); //fs.Dispose(); } catch(Exception ex) { MessageBox.Show(ex.Message); } strFilePath =file.FileName; } else{ return; } }
checkSum的算法实现
public string checkSum(string line)//计算文件一行的校验和（一行文件string不包含最后两位校验和）返回string为校验和结果一字节 { string checksum = null; int sum = 0; string[] shu = new string[line.Length / 2]; for (int i = 1; i < line.Length / 2; i++) { shu[i] = line.Substring(i * 2, 2); sum += Convert.ToInt32(shu[i], 16); } int jieguo = 255 -sum; string he = Convert.ToString(jieguo, 16).PadLeft(2, '0'); checksum = he.Substring(he.Length - 2, 2).ToUpper(); returnchecksum; }
C#替换文本内容，数据量不太大的话直接Replace为""。
usingSystem.IO; //读取文本 StreamReader sr = newStreamReader(文本文件的路径); string str =sr.ReadToEnd(); sr.Close(); //替换文本 str = str.Replace("E103","E103**"); //更改保存文本 StreamWriter sw = new StreamWriter(文本文件的路径,false); sw.WriteLine(str); sw.Close();
C#删除文件内容，用正则表达式
string s = File.ReadAllText(Server.MapPath("~/test.txt")); string r = Regex.Replace(s, @"(?m) ^3;.*$", ""); File.WriteAllText(Server.MapPath("~/test.txt"), r);