C#winform中OpenFileDialog的用法

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private void btnOpenFileDialog_Click(object sender, EventArgs e)        {            OpenFileDialog oFD = new OpenFileDialog();            oFD.Title = "開啟檔案";            oFD.ShowHelp = true;            oFD.Filter = "文字檔|*.txt|RTF檔案|*.rtf|所有檔案|*.*";//過濾格式            oFD.FilterIndex = 1;                                    //格式索引            oFD.RestoreDirectory = false;            oFD.InitialDirectory = "c:\\";                          //預設路徑            oFD.Multiselect = true;                                 //是否多選            if (oFD.ShowDialog() == DialogResult.OK)            {                MessageBox.Show(oFD.FileName);                MessageBox.Show(oFD.FileNames[0]);                MessageBox.Show(oFD.SafeFileName);                MessageBox.Show(oFD.SafeFileNames[0]);            }        }