WinForm中变Enter键为Tab键实现焦点转移的方法

/// <summary>
/// 窗体控件控制相关的方法
/// </summary>
public class ControlTools
{
    private Form frm;
    public ControlTools(Form frm)
    {
      this.frm = frm;
    }
    /// <summary>
    /// 窗体上所有子控件的回车设成Tab
    /// </summary>
    public void EnterToTab()
    {
      frm.KeyPreview = true;
      frm.KeyPress += new KeyPressEventHandler(frm_KeyPress);
    }
    /// <summary>
    /// 注册窗体的KeyPress事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void frm_KeyPress(object sender, KeyPressEventArgs e)
    {
      if (e.KeyChar == (char)Keys.Enter)
      {
        frm.SelectNextControl(frm.ActiveControl, true, true, true, true);
      }
    }
    /// <summary>
    /// 把某一个控件的所有子控件(TextBox ComboBox)的回车设成Tab
    /// </summary>
    /// <param name="groupControl">容器控件</param>
    public void EnterToTab(Control groupControl)
    {
      foreach (Control control in groupControl.Controls)
      {
        if (control is TextBox || control is ComboBox)
          control.KeyPress += new KeyPressEventHandler(control_KeyPress);
      }
    }
    /// <summary>
    /// 注册控件的KeyPress事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void control_KeyPress(object sender, KeyPressEventArgs e)
    {
      if (e.KeyChar == 13)
      {
        SendKeys.Send("{Tab}");
        e.Handled = false;
      }
    }
}