C#中实现读/写文件(一种常用的方法)...

StreamWriterwriter;
StreamReaderreader;
FileStreamfs;

privatevoidopenBtn_Click(objectsender,System.EventArgse)
...{
stringtheFile;
openFileDialog1.InitialDirectory=Application.ExecutablePath;
openFileDialog1.Filter="wordFiles(*.doc)|*.doc|AllFiles(*.*)|*.*";
if(openFileDialog1.ShowDialog()==DialogResult.OK)
...{
theFile=openFileDialog1.FileName;
try
...{
fs=newFileStream(theFile,FileMode.Open);
reader=newStreamReader(fs);
textBox1.Text=reader.ReadToEnd();
}
catch(Exceptionexcep)
...{
MessageBox.Show(excep.Message);
}
finally
...{
reader.Close();
fs.Close();
}
}
}

//以下是保存文件的代码

privatevoidsaveBtn_Click(objectsender,System.EventArgse)
...{
stringtheFile;
saveFileDialog1.InitialDirectory=Application.ExecutablePath;
saveFileDialog1.Filter="wordFiles(*.doc)|*.doc|AllFiles(*.*)|*.*";
saveFileDialog1.OverwritePrompt=true;
saveFileDialog1.ShowDialog();
theFile=saveFileDialog1.FileName;
try
...{
fs=newFileStream(theFile,FileMode.Create);
writer=newStreamWriter(fs);
writer.Write(textBox1.Text);
}
catch(Exceptionexcep)
...{
MessageBox.Show(excep.Message);
}
finally
...{
writer.Flush();
writer.Close();
fs.Close();
}
}