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;      }    }}