C#:文件的按行读/写及文件目录对话框的使用

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Author:David Euler
Date: 2004/11/16
Email:[email protected] 
有任何问题,请与我联系:)

                     按行读写文件
判断文件是否存在:File.Exists(string filePath)
判断目录是否存在:Directory.Exists("D:\\LastestVersion")

按行读取文件:
 int fileCount=0;
 // Open the file just specified such that no one else can use it.
 StreamReader sr = new StreamReader(textBox1.Text.Trim());
 while(sr.Peek() > -1)//StreamReader.Peek()返回下一个可用字符,但不使用它
 {
  listBox1.Items.Add(sr.ReadLine());
  fileCount++;
 }
 sr.Close();

按行写入文件:
 StreamWriter sw = new StreamWriter("D:\\result.txt");
 for(int i=0;i<10;i++)
 {
  sw.WriteLine("这是第"+i.ToString()+"行数据");
 }

                     文件目录对话框的使用
文件对话框即过滤条件的使用:
 string resultFile="";
 OpenFileDialog openFileDialog1 = new OpenFileDialog();
 openFileDialog1.InitialDirectory = "D:\\Patch" ;
 openFileDialog1.Filter = "All files (*.*)|*.*|txt files (*.txt)|*.txt" ;
 openFileDialog1.FilterIndex = 2 ;
 openFileDialog1.RestoreDirectory = true ;
 if(openFileDialog1.ShowDialog() == DialogResult.OK)
  resultFile=openFileDialog1.FileName; 

目录对话框的使用:
 string resultFolder="";
 FolderBrowserDialog openFolderDialog1=new FolderBrowserDialog();
 openFolderDialog1.RootFolder=Environment.SpecialFolder.MyComputer;  
 if(openFolderDialog1.ShowDialog()==DialogResult.OK)
  resultFolder=openFolderDialog1.SelectedPath; 

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