【C#】 打开文件浏览窗口

private   void   openFileDialogBTN_Click(o   b   j   e   c   t   sender,   System.EventArgs   e){  OpenFileDialog openFileDialog=new OpenFileDialog();  openFileDialog.InitialDirectory="c:\\";  openFileDialog.Filter="文本文件|*.*|C#文件|*.cs|所有文件|*.*";  openFileDialog.RestoreDirectory=true;  openFileDialog.FilterIndex=1;  if (openFileDialog.ShowDialog()==DialogResult.OK)  {  fName=openFileDialog.FileName;  File fileOpen=new File(fName);  isFileHaveName=true;  richTextBox1.Text=fileOpen.ReadFile();  richTextBox1.AppendText("");  }  }//浏览文件夹  private void button2_Click(object sender, EventArgs e)  {  FolderBrowserDialog dlg = new FolderBrowserDialog();  if (dlg.ShowDialog() == DialogResult.OK)  MessageBox.Show(dlg.SelectedPath.ToString());  }//打开文件  private void button3_Click(object sender, EventArgs e)  {  OpenFileDialog dlg = new OpenFileDialog();  if (dlg.ShowDialog() == DialogResult.OK)  MessageBox.Show(dlg.FileName);  }