C#:文件的按行读/写及文件目录对话框的使用

Author:David Euler

Date: 2004/11/16

Email:de_euler-david@yahoo.com.cn

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;