C# 文件夹，文件操作

1 设置文件保存路径

FolderBrowserDialog fbd = new FolderBrowserDialog();
fbd.ShowDialog();
folderName = fbd.SelectedPath; //获得选择的文件夹路径

2 向文件中写入数据

 FileStream fs = new FileStream(savePath,FileMode.Append);
 StreamWriter sw = new StreamWriter(fs);
 sw.WriteLine(builder.ToString());
 sw.Close();
 fs.Close();

3 遍历文件夹查找文件

 List<string> saveFlieName = new List<string>();
 DirectoryInfo TheFolder = new DirectoryInfo(filePath);
            //遍历文件
 saveFlieName.Clear();
 ReadFile rf = new ReadFile();
 foreach (FileInfo NextFile in TheFolder.GetFiles())
  saveFlieName.Add(NextFile.Name);

//查找txt文件
//Directory.GetFiles(_path, "*.txt", SearchOption.AllDirectories);