MSDN模版
Stream myStream =null; OpenFileDialog openFileDialog1 =newOpenFileDialog(); openFileDialog1.InitialDirectory="c:\"; openFileDialog1.Filter="txt files (*.txt)|*.txt|All files (*.*)|*.*"; openFileDialog1.FilterIndex=2; openFileDialog1.RestoreDirectory=true; if(openFileDialog1.ShowDialog()==DialogResult.OK) { // open the file }