怎样打开默认路径？

Question

比如我要点击一个按钮打开"E:\aa",
可以看见的文件类型为*.txt或者所有文件
c#中怎莫写呢

Answer 1

OpenFileDialog o = new OpenFileDialog();
            o.Filter = "*.*|*";

Answer 2

OpenFileDialog ofd = new OpenFileDialog(); 
            ofd.Filter = "所有文件|*.*|所有Txt文件|*.txt"; 

Answer 3

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.InitialDirectory = @"e:\aa\";
            ofd.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
            ofd.ShowDialog();
        }